Mechanical Engineering
Which one of the following is true for black body- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
Which one of the following is true for black body
a)
b)
c)
d)
DINESH GARG answered • 58 minutes agoSince black body is perfect absorber of radiation hence absorptivity of black body α = 1.
Akshansh Sharma asked • 16 minutes agoFor the same indicated work per cycle, mean speed and permissible fluctuation of speed, what is the size of flywheel required for a multi-cylinder engine in comparison to a single cylinder engine?- a)Bigger
- b)Smaller
- c)Same
- d)depends on thermal efficiency of the engine
Correct answer is option 'B'. Can you explain this answer?
For the same indicated work per cycle, mean speed and permissible fluctuation of speed, what is the size of flywheel required for a multi-cylinder engine in comparison to a single cylinder engine?
a)
Bigger
b)
Smaller
c)
Same
d)
depends on thermal efficiency of the engine
A plate having 10 cm2 area each side is hanging in the middle of a room of 100 m2 total surface area, the plate temperature and emissivity are respectively 800 K and 0.6. The temperature and emissivity values for the surface of the room are 300 K and 0.3 respectively. Boltzman’ constant σ = 5.67 x 10-8 W/m2K4. The total heat loss from the two surface of the plate is- a)13.66 W
- b)27.32 W
- c)27.87 W
- d)13.66 MW
Correct answer is option 'B'. Can you explain this answer?
A plate having 10 cm2 area each side is hanging in the middle of a room of 100 m2 total surface area, the plate temperature and emissivity are respectively 800 K and 0.6. The temperature and emissivity values for the surface of the room are 300 K and 0.3 respectively. Boltzman’ constant σ = 5.67 x 10-8 W/m2K4. The total heat loss from the two surface of the plate is
a)
13.66 W
b)
27.32 W
c)
27.87 W
d)
13.66 MW
RAM AGARWAL answered • 58 minutes agoA1 = 20 cm2 = 20 x 10-4m2
A2 = 100 m2
T1 = 800K
∈1 = 0.6
T2 = 300 K
∈2 = 0.3
A2 = 100 m2
T1 = 800K
∈1 = 0.6
T2 = 300 K
∈2 = 0.3
Two long parallel surfaces each of emissivity 07 are maintained at different temperature and accordingly have radiation heat exchange between them. It is desirable to reduce 75% of this radiant heat transfer by inserting thin parallel shields of equal emissivity on both sides. The number of shields should be- a)one
- b)two
- c)three
- d)four
Correct answer is option 'C'. Can you explain this answer?
Two long parallel surfaces each of emissivity 07 are maintained at different temperature and accordingly have radiation heat exchange between them. It is desirable to reduce 75% of this radiant heat transfer by inserting thin parallel shields of equal emissivity on both sides. The number of shields should be
a)
one
b)
two
c)
three
d)
four
GAJENDER SINGH answered • 58 minutes ago
where N = Number of radiation shield
An electronic device in the form of a wire is found to dissipate maximum heat when its outer most diameter = 32 mm. Keeping all the parameter same, it is proposed to use the same device in spherical form. The ideal diameter would be- a)32 mm
- b)16 mm
- c)64 mm
- d)8 mm
Correct answer is option 'A'. Can you explain this answer?
An electronic device in the form of a wire is found to dissipate maximum heat when its outer most diameter = 32 mm. Keeping all the parameter same, it is proposed to use the same device in spherical form. The ideal diameter would be
a)
32 mm
b)
16 mm
c)
64 mm
d)
8 mm
SANDEEP SHAH answered • 58 minutes ago
Anuj Chauhan asked • 26 minutes agoIn the calculation of induced shear stress in helical springs, the Wahl's correction factor is used to take care of - a)Combined effect of transverse shear stress and bending stresses in the wire.
- b)Combined effect of bending stress and curvature of the wire.
- c)Combined effect of transverse shear stress and curvature of the wire.
- d)Combined effect of torsional shear stress and transverse shear stress in the wire.
Correct answer is option 'C'. Can you explain this answer?
In the calculation of induced shear stress in helical springs, the Wahl's correction factor is used to take care of
a)
Combined effect of transverse shear stress and bending stresses in the wire.
b)
Combined effect of bending stress and curvature of the wire.
c)
Combined effect of transverse shear stress and curvature of the wire.
d)
Combined effect of torsional shear stress and transverse shear stress in the wire.
The thermal radiative flux from a surface of emissivity = 0 .4 is 22.68 kW /m2. The approximate surface temperature (K) is
Stefan Boltzmann's constant = 5.67x10-8 W/m2K4- a)1000
- b)727
- c)800
- d)1200
Correct answer is option 'A'. Can you explain this answer?
The thermal radiative flux from a surface of emissivity = 0 .4 is 22.68 kW /m2. The approximate surface temperature (K) is
Stefan Boltzmann's constant = 5.67x10-8 W/m2K4
Stefan Boltzmann's constant = 5.67x10-8 W/m2K4
a)
1000
b)
727
c)
800
d)
1200
ARUN KUMAR answered • 11 hours agoWe know, for radiation heat transfer
Udaygopal Kollikonda asked • 54 minutes agoCarbonisation of coal is the process of- a)enriching carbon in the coal
- b)strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
- c)heating wood in a limited supply of air of temperatures below = 300°C
- d)pulverising coal in inert atmosphere
Correct answer is option 'B'. Can you explain this answer?
Carbonisation of coal is the process of
a)
enriching carbon in the coal
b)
strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
c)
heating wood in a limited supply of air of temperatures below = 300°C
d)
pulverising coal in inert atmosphere
A composite wall of a furnace has 3 layers of equal thickness having thermal conductivities the ratio of 1 : 2 : 4. What will be the temperature drop ratio across the three respective layer- a)1 : 2 : 4
- b)4: 2: 1
- c)1 : 1 : 1
- d)log 4 : log 2 : log 1
Correct answer is option 'B'. Can you explain this answer?
A composite wall of a furnace has 3 layers of equal thickness having thermal conductivities the ratio of 1 : 2 : 4. What will be the temperature drop ratio across the three respective layer
a)
1 : 2 : 4
b)
4: 2: 1
c)
1 : 1 : 1
d)
log 4 : log 2 : log 1
DEEPAK SHIVHARE answered • 11 hours agoFrom the fourier law of heat conduction
Supantha Sarkar asked • 1 hour agoConsider the following statements relating to hydraulic gradient line and energy gradient line:
1.In the case of a fluid flowing in a pipeline, hydraulic gradient line and energy gradient line may coincide.
2.The line joining the points representing piezometric heads is known as hydraulic gradient.
In the case of ideal fluid, energy gradient line is always horizontal.
3.Hydraulic gradient line has a downward slope in the case of flow through pipes.
Of these statements,... more
Consider the following statements relating to hydraulic gradient line and energy gradient line:
1.In the case of a fluid flowing in a pipeline, hydraulic gradient line and energy gradient line may coincide.
2.The line joining the points representing piezometric heads is known as hydraulic gradient.
In the case of ideal fluid, energy gradient line is always horizontal.
3.Hydraulic gradient line has a downward slope in the case of flow through pipes.
Of these statements,
1.In the case of a fluid flowing in a pipeline, hydraulic gradient line and energy gradient line may coincide.
2.The line joining the points representing piezometric heads is known as hydraulic gradient.
In the case of ideal fluid, energy gradient line is always horizontal.
3.Hydraulic gradient line has a downward slope in the case of flow through pipes.
Of these statements,
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is kW/m2. The flux when the element temperature is increased to 1000°C for the same furnace temperature is- a)11.2 kW/m2
- b)12.0 kW/m2
- c)14.6 kW/m2
- d)16.5 kW/m2
Correct answer is option 'D'. Can you explain this answer?
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is kW/m2. The flux when the element temperature is increased to 1000°C for the same furnace temperature is
a)
11.2 kW/m2
b)
12.0 kW/m2
c)
14.6 kW/m2
d)
16.5 kW/m2
MANOJ SHIVHARE answered • 11 hours agoFor radiation heat transfer
Devang Mathurekar asked • 1 hour agoDecreasing grain size in a polycrystalline material - a)Increases yield strength and corrosion resistance.
- b)Decreases yield strength and corrosion resistance
- c)Decreases yield strength but increases corrosion resistance
- d)Increases yield strength but decreases corrosion resistance.
Correct answer is option 'A'. Can you explain this answer?
Decreasing grain size in a polycrystalline material
a)
Increases yield strength and corrosion resistance.
b)
Decreases yield strength and corrosion resistance
c)
Decreases yield strength but increases corrosion resistance
d)
Increases yield strength but decreases corrosion resistance.
For a circular tube of equal length and diameter shown below, the view factor F13 = 0.17. The view factor F12 in this case will be
- a)0.17
- b)0.21
- c)0.79
- d)0.83
Correct answer is option 'D'. Can you explain this answer?
For a circular tube of equal length and diameter shown below, the view factor F13 = 0.17. The view factor F12 in this case will be
a)
0.17
b)
0.21
c)
0.79
d)
0.83
RAM JHA answered • 11 hours agof11 + f12 + f13 = 1
f11 = 0
f12 = 1 - f13
f12 = 1 - 0.17 = 0.83
f11 = 0
f12 = 1 - f13
f12 = 1 - 0.17 = 0.83
A slab of thickness L with one side (x = 0) insulated and other side (x = L) maintained at a constant temperature T0 is shown below:
A uniformly distributed internal heat source produces heat in the slab at the rate of W/m3. Assume the heat conduction to be steady state and 1 - D along the x-direction, the maximum temperature in the slab occurs at x equal to- a)0
- b)L/4
- c)L/2
- d)L
Correct answer is option 'A'. Can you explain this answer?
A slab of thickness L with one side (x = 0) insulated and other side (x = L) maintained at a constant temperature T0 is shown below:
A uniformly distributed internal heat source produces heat in the slab at the rate of W/m3. Assume the heat conduction to be steady state and 1 - D along the x-direction, the maximum temperature in the slab occurs at x equal to
A uniformly distributed internal heat source produces heat in the slab at the rate of W/m3. Assume the heat conduction to be steady state and 1 - D along the x-direction, the maximum temperature in the slab occurs at x equal to
a)
0
b)
L/4
c)
L/2
d)
L
DILPREET SINGH answered • 11 hours agoFor maximum temp, in the wall
Manish Patel asked • 1 hour agoThe concept of continuum in fluid flow assumes that the characteristics length of the flow is - a)smaller than the mean free path of the molecules.
- b)larger than the mean free path of the molecule
- c)larger than the dimensions of the suspended particles
- d)larger than the wavelength of sound in the medium.
Correct answer is option 'B'. Can you explain this answer?
The concept of continuum in fluid flow assumes that the characteristics length of the flow is
a)
smaller than the mean free path of the molecules.
b)
larger than the mean free path of the molecule
c)
larger than the dimensions of the suspended particles
d)
larger than the wavelength of sound in the medium.
The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey surface (emissivity = 0.9) maintained at 400 K and 300 K is (StefanBoltzmann constant s = 5.67 x 10-8 W/m2K4)- a)1020
- b)464
- c)812
- d)567
Correct answer is option 'C'. Can you explain this answer?
The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey surface (emissivity = 0.9) maintained at 400 K and 300 K is (StefanBoltzmann constant s = 5.67 x 10-8 W/m2K4)
a)
1020
b)
464
c)
812
d)
567
NARESH DESHMUKH answered • 11 hours ago
Chandan Patel 007 asked • 2 hours agoIn carrying out a work sampling study in a machine shop, it was found that a particular lathe was down for 20% of the time. What would be the 95% confidence interval of this estimate if 100 observations were made? - a)0.16, 0.24
- b)0.12, 0.28
- c)0.08, 0.32
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
In carrying out a work sampling study in a machine shop, it was found that a particular lathe was down for 20% of the time. What would be the 95% confidence interval of this estimate if 100 observations were made?
a)
0.16, 0.24
b)
0.12, 0.28
c)
0.08, 0.32
d)
None of these
Chandan Patel 007 asked • 2 hours agoA control chart is established with limits of ± 2 standard errors for use in monitoring samples of size n = 20. Assume the process to be in control. What is the likelihood of a sample mean falling outside the control limits? - a)97.7%
- b)95.5%
- c)4.5%
- d)2.3%
Correct answer is option 'C'. Can you explain this answer?
A control chart is established with limits of ± 2 standard errors for use in monitoring samples of size n = 20. Assume the process to be in control. What is the likelihood of a sample mean falling outside the control limits?
a)
97.7%
b)
95.5%
c)
4.5%
d)
2.3%
Sreenath Narayandas asked • 4 hours agoThe hydro-state thrust bearing consists of six pads; each pad can be approximated as circular area of 500 mm and 100 mm as outer and inner diameters respectively. The total thrust load is 900 kN and film thickness is 0.05 mm and the viscosity of the lubricant is 58.86 cp.Q.Determine the supply pressure- a) 15.36 MPa
- b) 1.11 MPa
- c) 2.56 MPa
- d) 6.67 MPa
Correct answer is option 'C'. Can you explain this answer?
The hydro-state thrust bearing consists of six pads; each pad can be approximated as circular area of 500 mm and 100 mm as outer and inner diameters respectively. The total thrust load is 900 kN and film thickness is 0.05 mm and the viscosity of the lubricant is 58.86 cp.
Q.
Determine the supply pressure
a)
15.36 MPa
b)
1.11 MPa
c)
2.56 MPa
d)
6.67 MPa
Sermarani P asked • 4 hours agoThe essential condition for the transfer of heat from one body to another is.- a)both bodies must be in physical contact
- b)heat content of one body must be more than that of the other
- c)one of the bodies must have a high value of thermal conductivity
- d)there must exist a temperature difference between the bodies
Correct answer is option 'D'. Can you explain this answer?
The essential condition for the transfer of heat from one body to another is.
a)
both bodies must be in physical contact
b)
heat content of one body must be more than that of the other
c)
one of the bodies must have a high value of thermal conductivity
d)
there must exist a temperature difference between the bodies
Sravani asked • 5 hours agoAssertion (A): Rankine efficiency would approach Carnot cycle efficiency byproviding a series of regenerative feed heating.Reason (R): With regenerative feed heating, expansion through the turbine approaches an isentropic process. - a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): Rankine efficiency would approach Carnot cycle efficiency byproviding a series of regenerative feed heating.Reason (R): With regenerative feed heating, expansion through the turbine approaches an isentropic process.
a)
Both A and R are individually true and R is the correct explanation of A
b)
Both A and R are individually true but R is not the correct explanation of A
c)
A is true but R is false
d)
A is false but R is true
Hardik Barot asked • 7 hours agoThe standard specification of a grinding wheel is A-46=M-6-V-21. It means a wheel of- a)Aluminum oxide of mesh size 6
- b)Boron carbide of mesh size 46
- c)Aluminum oxide of mesh size 46
- d)Silicon carbide of mesh size 6
Correct answer is option 'C'. Can you explain this answer?
The standard specification of a grinding wheel is A-46=M-6-V-21. It means a wheel of
a)
Aluminum oxide of mesh size 6
b)
Boron carbide of mesh size 46
c)
Aluminum oxide of mesh size 46
d)
Silicon carbide of mesh size 6
Sagar Bansal asked • 7 hours agoTwo insulating materials of thermal conductivity K and 2K are available for lagging a pipe carrying a hot fluid. If the radial thickness of each material is the same. - a)Material with higher thermal conductivity should be used for the inner layerand one with lower thermal conductivity for the outer.
- b)Material with lower thermal conductivity should be used for the inner layerand one with higher thermal conductivity for the outer.
- c)It is immaterial in which sequence the insulating materials are used.
- d)It is not possible to judge unless numerical values of dimensions are given.
Correct answer is option 'B'. Can you explain this answer?
Two insulating materials of thermal conductivity K and 2K are available for lagging a pipe carrying a hot fluid. If the radial thickness of each material is the same.
a)
Material with higher thermal conductivity should be used for the inner layerand one with lower thermal conductivity for the outer.
b)
Material with lower thermal conductivity should be used for the inner layerand one with higher thermal conductivity for the outer.
c)
It is immaterial in which sequence the insulating materials are used.
d)
It is not possible to judge unless numerical values of dimensions are given.
Wasi Khan asked • 7 hours agoConsider the following statements:If at a section distant from one of the ends of the beam, M represents the bending moment. V the shear force and w the intensity of loading, then1. dM/dx = V2. dV/dx = w 3. dw/dx = y(the deflection of the beam at the section)Select the correct answer using the codes given below:- a)1 and 3
- b)1 and 2
- c)2 and 3
- d)1, 2 and 3
Correct answer is option 'B'. Can you explain this answer?
Consider the following statements:
If at a section distant from one of the ends of the beam, M represents the bending moment. V the shear force and w the intensity of loading, then
1. dM/dx = V
2. dV/dx = w
3. dw/dx = y
(the deflection of the beam at the section)
Select the correct answer using the codes given below:
a)
1 and 3
b)
1 and 2
c)
2 and 3
d)
1, 2 and 3
Gnaneswar G asked • 7 hours agoIf cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be- a)higher than the surface of liquid
- b)the same as the surface of liquid
- c)lower than the surface of liquid
- d)unpredictable
- e)none of the above
Correct answer is option 'C'. Can you explain this answer?
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
a)
higher than the surface of liquid
b)
the same as the surface of liquid
c)
lower than the surface of liquid
d)
unpredictable
e)
none of the above
Udit Agrawal asked • 8 hours agoThe value of heat and work transfer for the flow processes of a thermodynamic cycle are given below:
The thermal efficiency and work ratio for the cycle will be respectively- a)33% and 0.66
- b)66% and 0.36
- c)36% and 0.66
- d)33% and 0.36
Correct answer is option 'B'. Can you explain this answer?
The value of heat and work transfer for the flow processes of a thermodynamic cycle are given below:
The thermal efficiency and work ratio for the cycle will be respectively
a)
33% and 0.66
b)
66% and 0.36
c)
36% and 0.66
d)
33% and 0.36
Aadarsh Vikram asked • 8 hours agoConsider the following statements for a 4-cylinder inline engine whose cranks are arranged at regular intervals of 90°:1. There are 8 possible firing orders for the engine.
2. Primary force will remain unbalanced for some firing orders.Which of the statements given above is/are correct?- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'D'. Can you explain this answer?
Consider the following statements for a 4-cylinder inline engine whose cranks are arranged at regular intervals of 90°:
1. There are 8 possible firing orders for the engine.
2. Primary force will remain unbalanced for some firing orders.
2. Primary force will remain unbalanced for some firing orders.
Which of the statements given above is/are correct?
a)
1 only
b)
2 only
c)
Both 1 and 2
d)
Neither 1 nor 2
Alpesh Jain asked • 9 hours agoBuyers products company distributes an item known as a tie bar, which is a U-bolt used on truck equipment. The following data have been collected for this item held in inventory.
Monthly demand forecast, d = 11,107 unitsStandard error of forecast = 3,099 unitsReplenishment lead time, LT = 1.5 monthsItem value, C = $ 0.11/unitCost for processing vendor order, S = $ 10/orderCarrying cost, I = 20%/yearIn-stock probability during lead time,P = 75% Find the reorder level... more
Buyers products company distributes an item known as a tie bar, which is a U-bolt used on truck equipment. The following data have been collected for this item held in inventory.
Monthly demand forecast, d = 11,107 units
Monthly demand forecast, d = 11,107 units
Standard error of forecast = 3,099 units
Replenishment lead time, LT = 1.5 months
Item value, C = $ 0.11/unit
Cost for processing vendor order, S = $ 10/order
Carrying cost, I = 20%/year
In-stock probability during lead time,
P = 75% Find the reorder level
Vipin Kumar asked • 9 hours agoThe process of making hollow castings of non circular shape and desired thickness of non circular shape and desired thickness by permanent mould without use of core is known as- a)die casting
- b)Slush casting
- c)Pressed casting
- d)Centrifugal casting
Correct answer is option 'B'. Can you explain this answer?
The process of making hollow castings of non circular shape and desired thickness of non circular shape and desired thickness by permanent mould without use of core is known as
a)
die casting
b)
Slush casting
c)
Pressed casting
d)
Centrifugal casting
Bhushana Rao Kona asked • 9 hours agoAccording to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then- a)their algebraic sum is zero
- b)their lines of action are at equal distances
- c)the algebraic sum of their moments about any point in their plane is zero
- d)the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
Correct answer is option 'C'. Can you explain this answer?
According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then
a)
their algebraic sum is zero
b)
their lines of action are at equal distances
c)
the algebraic sum of their moments about any point in their plane is zero
d)
the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.
Achuth Kumar Yelleti asked • 10 hours agoAssertion (A): If the bending moment along the length of a beam is constant, then the beam cross section will not experience any shear stress.Reason (R): The shear force acting on the beam will be zero everywhere along the length.- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is NOT the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): If the bending moment along the length of a beam is constant, then the beam cross section will not experience any shear stress.
Reason (R): The shear force acting on the beam will be zero everywhere along the length.
a)
Both A and R are individually true and R is the correct explanation of A
b)
Both A and R are individually true but R is NOT the correct explanation of A
c)
A is true but R is false
d)
A is false but R is true
Rohan Pal asked • 10 hours agoIf a bearing is designated by the number 305, it means that the bearing is of- a)light series whose bore is 5 mm
- b)light series whose bore is 25 mm
- c)medium series whose bore is 5 mm
- d)medium series whose bore is 25 mm
Correct answer is option 'D'. Can you explain this answer?
If a bearing is designated by the number 305, it means that the bearing is of
a)
light series whose bore is 5 mm
b)
light series whose bore is 25 mm
c)
medium series whose bore is 5 mm
d)
medium series whose bore is 25 mm
Achuth Kumar Yelleti asked • 11 hours agoA beam having uniform cross-section carries a uniformly distributed load of intensity q per unit length over its entire span, and its mid-span deflection is δ.The value of mid-span deflection of the same beam when the same load is distributed with intensity varying from 2q unit length at one end to zero at the other end is:- a)1/3 δ
- b)1/2 δ
- c)2/3 δ
- d)δ
Correct answer is option 'D'. Can you explain this answer?
A beam having uniform cross-section carries a uniformly distributed load of intensity q per unit length over its entire span, and its mid-span deflection is δ.
The value of mid-span deflection of the same beam when the same load is distributed with intensity varying from 2q unit length at one end to zero at the other end is:
a)
1/3 δ
b)
1/2 δ
c)
2/3 δ
d)
δ
Abhishek Govil asked • 11 hours agoIn a vapour compression refrigeration system, throttle valve is used in place of an expander because- a)it considerably reduces the system weight
- b)it improves the COP, as the condenser is small
- c)the positive work in isentropic expansion of liquid is very small
- d)it leads to significant cost reduction
Correct answer is option 'C'. Can you explain this answer?
In a vapour compression refrigeration system, throttle valve is used in place of an expander because
a)
it considerably reduces the system weight
b)
it improves the COP, as the condenser is small
c)
the positive work in isentropic expansion of liquid is very small
d)
it leads to significant cost reduction
Abhishek Govil asked • 11 hours agoAn elastic body is subjected to a tensile stress X in a particular direction and a compressive stressY in its perpendicular direction. X and Y are unequal in magnitude. On the plane of maximumshear stress in the body there will be- a)no normal stress
- b)also the maximum normal stress
- c)the minimum normal stress
- d)both normal stress and shear
Correct answer is option 'D'. Can you explain this answer?
An elastic body is subjected to a tensile stress X in a particular direction and a compressive stressY in its perpendicular direction. X and Y are unequal in magnitude. On the plane of maximumshear stress in the body there will be
a)
no normal stress
b)
also the maximum normal stress
c)
the minimum normal stress
d)
both normal stress and shear
Pk Patel asked • 12 hours agoWhich one of the following statements is NOT true of rolling contact bearing? - a)The bearing characteristic number is given by ZN/p where Z is the absolute viscosity of the lubricant, N is the shaft speed and p is the bearing pressure.
- b)Inner race of a radial ball bearing has an interference fit with the shaft and rotates along with it
- c)Outer race of the bearing has an interference fit with bearing housing and does not rotate
- d)In some cases, the inner race is stationary and outer race rotates
Correct answer is option 'D'. Can you explain this answer?
Which one of the following statements is NOT true of rolling contact bearing?
a)
The bearing characteristic number is given by ZN/p where Z is the absolute viscosity of the lubricant, N is the shaft speed and p is the bearing pressure.
b)
Inner race of a radial ball bearing has an interference fit with the shaft and rotates along with it
c)
Outer race of the bearing has an interference fit with bearing housing and does not rotate
d)
In some cases, the inner race is stationary and outer race rotates
Navdeep Jadoun asked • 12 hours agoKey concept in analyzing the filling of an evacuated tank is- a)the mass flow rate in the tank remains constant
- b)the enthalpy across the valve remains constant
- c)the internal energy in the tank remains constant
- d)the temperature in the tank remains constant
Correct answer is option 'B'. Can you explain this answer?
Key concept in analyzing the filling of an evacuated tank is
a)
the mass flow rate in the tank remains constant
b)
the enthalpy across the valve remains constant
c)
the internal energy in the tank remains constant
d)
the temperature in the tank remains constant
Ankit Singh asked • 12 hours agoWhich of the following pattern-materials are used in Precision Casting?1. Plaster of Paris2. Plastics3. Anodized Aluminium Alloy 4. Frozen MercurySelect the correct answer using the codes given below: - a)1 and 2
- b)2 and 4
- c)3 and 4
- d)1 and 3
Correct answer is option 'B'. Can you explain this answer?
Which of the following pattern-materials are used in Precision Casting?
1. Plaster of Paris
2. Plastics
3. Anodized Aluminium Alloy
4. Frozen Mercury
Select the correct answer using the codes given below:
a)
1 and 2
b)
2 and 4
c)
3 and 4
d)
1 and 3
Sai Teja asked • 12 hours agoA round rod of annealed bras 70-30 is being drawn from a diameter of 8 mm to a diameter of 4 mm at a speed of 0.8 m/s. (k = 895 MPa, n = 0.49)Q.The power required in this operation is- a)3.497 kW
- b)1.47 kW
- c)2.88 kW
- d)2.32 kW
Correct answer is option 'A'. Can you explain this answer?
A round rod of annealed bras 70-30 is being drawn from a diameter of 8 mm to a diameter of 4 mm at a speed of 0.8 m/s. (k = 895 MPa, n = 0.49)
Q.
The power required in this operation is
a)
3.497 kW
b)
1.47 kW
c)
2.88 kW
d)
2.32 kW
SANDEEP SHAH asked • 12 hours agoAir at 100 KPa and 280 K is compressed steadily to 600 KPa and 400 K. The mass flow rate of air is 0.02 Kg/s and a heat loss of 16 kJ/Kg occurs during the process. The power input to compressor will be_____kW
Correct answer is between '-2.730,-2.372'. Can you explain this answer?
Air at 100 KPa and 280 K is compressed steadily to 600 KPa and 400 K. The mass flow rate of air is 0.02 Kg/s and a heat loss of 16 kJ/Kg occurs during the process. The power input to compressor will be_____kW
Gokul Krishnan asked • 13 hours agoConsider the following operations involved in forging a hexagonal bolt from a round bar stock, whose diameter is equal to the bolt diameter:
1. Flattening 2. Upsetting 3. Swaging 4. CamberingQ.The correct sequence of these operations is- a)1, 2, 3, 4
- b)2, 3, 4, 1
- c)2, 1, 3, 4
- d)3, 2, 1, 4
Correct answer is option 'A'. Can you explain this answer?
Consider the following operations involved in forging a hexagonal bolt from a round bar stock, whose diameter is equal to the bolt diameter:
1. Flattening 2. Upsetting 3. Swaging 4. Cambering
1. Flattening 2. Upsetting 3. Swaging 4. Cambering
Q.
The correct sequence of these operations is
a)
1, 2, 3, 4
b)
2, 3, 4, 1
c)
2, 1, 3, 4
d)
3, 2, 1, 4
Amit Sharma asked • 13 hours agoConsider the following statements: In the thermoelectric refrigeration, the coefficient of performance is a function of: 1. Electrical conductivity of materials 2. Pelti er coefficie nt 3. Seeb eck coefficie nt 4. Temperature at cold and hot junctions 5. Thermal conductivity of materials. Of these statements: [IES-1997]- a)1, 3, 4 and 5 are correct
- b)1, 2, 3 and 5 are correct
- c)1, 2, 4 and 5 are correct
- d)2, 3, 4 and 5 are correct
Correct answer is option 'C'. Can you explain this answer?
Consider the following statements: In the thermoelectric refrigeration, the coefficient of performance is a function of:
1. Electrical conductivity of materials
2. Pelti er coefficie nt
3. Seeb eck coefficie nt
4. Temperature at cold and hot junctions
5. Thermal conductivity of materials.
Of these statements:
[IES-1997]
a)
1, 3, 4 and 5 are correct
b)
1, 2, 3 and 5 are correct
c)
1, 2, 4 and 5 are correct
d)
2, 3, 4 and 5 are correct
Krishnendu Karmakar asked • 13 hours agoAssertion (A): While rolling metal sheet in rolling mill, the edges are sometimes not straight
and flat but are wavy. [IES-2003]
Reason (R): Non-uniform mechanical properties of the flat material rolled out result in waviness of the edges.- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R arc true but R is NOT the correct explanation of A
- c)A is true hut R is false
- d)A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
Assertion (A): While rolling metal sheet in rolling mill, the edges are sometimes not straight
and flat but are wavy. [IES-2003]
Reason (R): Non-uniform mechanical properties of the flat material rolled out result in waviness of the edges.
and flat but are wavy. [IES-2003]
Reason (R): Non-uniform mechanical properties of the flat material rolled out result in waviness of the edges.
a)
Both A and R are true and R is the correct explanation of A
b)
Both A and R arc true but R is NOT the correct explanation of A
c)
A is true hut R is false
d)
A is false but R is true
Aadarsh Vikram asked • 13 hours agoA compound cylinder with inner radius 5 cm and outer radius 7 cm is made by shrinking one cylinder on to the other cylinder. The junction radius is 6 cm and the junction pressure is 11 kgf/cm2. The maximum hoop stress developed in the inner cylinder is - a)36 kgf/cm2 compression
- b)36 kgf/cm2 tension
- c)72 kgf/cm2 compression
- d)72 kgf/cm2 tension.
Correct answer is option 'C'. Can you explain this answer?
A compound cylinder with inner radius 5 cm and outer radius 7 cm is made by shrinking one cylinder on to the other cylinder. The junction radius is 6 cm and the junction pressure is 11 kgf/cm2. The maximum hoop stress developed in the inner cylinder is
a)
36 kgf/cm2 compression
b)
36 kgf/cm2 tension
c)
72 kgf/cm2 compression
d)
72 kgf/cm2 tension.
Nilutpal D. asked • 13 hours agoA manufacturer's master product schedule of a product is given below:
Each product requires a purchased component A in its subassembly. Before the start of week-1, there are 400 components of type A in stock. The lead time to procure this component is 2 weeks and the order quantity is 400. Number of components A per product is only one. The manufacturer should place the order for ... more
A manufacturer's master product schedule of a product is given below:
Each product requires a purchased component A in its subassembly. Before the start of week-1, there are 400 components of type A in stock. The lead time to procure this component is 2 weeks and the order quantity is 400. Number of components A per product is only one. The manufacturer should place the order for
Kamal Bhardwaj asked • 13 hours agoAssertion (A): The degree of hunting with an unstable governor will be less than with an isochronous governor.Reason (R): With an unstable governor, once the sleeve has moved from one extreme position to the other, a finite change of speed is required to cause it to move back again.- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): The degree of hunting with an unstable governor will be less than with an isochronous governor.
Reason (R): With an unstable governor, once the sleeve has moved from one extreme position to the other, a finite change of speed is required to cause it to move back again.
a)
Both A and R are individually true and R is the correct explanation of A
b)
Both A and R are individually true but R is not the correct explanation of A
c)
A is true but R is false
d)
A is false but R is true
Pooja Shende asked • 14 hours agoAir is being forced by the bicycle pump into a tyre against a pressure of 4-5 bars. A slow downward movement of the piston can be approximated as- a)Isobaric process
- b)Adiabatic process
- c)Throttling process
- d)Isothermal process
Correct answer is option 'D'. Can you explain this answer?
Air is being forced by the bicycle pump into a tyre against a pressure of 4-5 bars. A slow downward movement of the piston can be approximated as
a)
Isobaric process
b)
Adiabatic process
c)
Throttling process
d)
Isothermal process
Sandip Mangal asked • 14 hours agoConsider the following quenching media:
1. Oil
2. Water
3. WaterNaOH
4. Brine
The correct sequence of these media in order of increasing hardness of steel under going heat treatment is
- a)1, 3, 2, 4
- b)2, 1, 3, 4
- c)1, 2, 3, 4
- d)none
Correct answer is option 'C'. Can you explain this answer?
Consider the following quenching media:
1. Oil
2. Water
3. WaterNaOH
4. Brine
1. Oil
2. Water
3. WaterNaOH
4. Brine
The correct sequence of these media in order of increasing hardness of steel under going heat treatment is
a)
1, 3, 2, 4
b)
2, 1, 3, 4
c)
1, 2, 3, 4
d)
none
Anunay Prasanna asked • 14 hours agoThe given diagram shows an isometric cooling process 1–2 of a pure substance. The ordinate and abscissa are respectively
- a)Pressure and volume
- b)Enthalpy and entropy
- c)Temperature and entropy
- d)Pressure and enthalpy
Correct answer is option 'D'. Can you explain this answer?
The given diagram shows an isometric cooling process 1–2 of a pure substance. The ordinate and abscissa are respectively
a)
Pressure and volume
b)
Enthalpy and entropy
c)
Temperature and entropy
d)
Pressure and enthalpy
Pooja Shende asked • 14 hours agoA 400 mm diameter shaft is rotating at 200 rpm in a bearing of length 120 mm. If the thickness of oil film is 1.5 mm and the dynamic viscosity of the oil is 0.7 Ns/m2 determine:
(i) Torque required overcoming friction in bearing;
(ii) Power utilization in overcoming viscous resistance;Correct answer is 'Ans. (i) 58.97 Nm (ii) 1.235 kW'. Can you explain this answer?
A 400 mm diameter shaft is rotating at 200 rpm in a bearing of length 120 mm. If the thickness of oil film is 1.5 mm and the dynamic viscosity of the oil is 0.7 Ns/m2 determine:
(i) Torque required overcoming friction in bearing;
(ii) Power utilization in overcoming viscous resistance;
(i) Torque required overcoming friction in bearing;
(ii) Power utilization in overcoming viscous resistance;
Dharani Kumar asked • 14 hours agoTwo blocks of iron and copper, both initially at 800C, are dropped into a large lake at 150C. The mass of the iron and copper blocks are 50kg and 20 kg respectively. After a while, the system is in thermal equilibrium due to heat transfer between blocks and lake water.Total entropy change for this process is:-
Ciron = 0.45 kJ/kg0C, Ccopper = 0.386 kJ/kg0C
- a)-4.579 kJ/K
- b)-1.571kJ/K
- c)0.670 kJ/K
- d)6.820 kJ/K
Correct answer is option 'C'. Can you explain this answer?
Two blocks of iron and copper, both initially at 800C, are dropped into a large lake at 150C. The mass of the iron and copper blocks are 50kg and 20 kg respectively. After a while, the system is in thermal equilibrium due to heat transfer between blocks and lake water.
Total entropy change for this process is:-
Ciron = 0.45 kJ/kg0C, Ccopper = 0.386 kJ/kg0C
Ciron = 0.45 kJ/kg0C, Ccopper = 0.386 kJ/kg0C
a)
-4.579 kJ/K
b)
-1.571kJ/K
c)
0.670 kJ/K
d)
6.820 kJ/K
Keshav Galav asked • 14 hours agoAn insulated tank contains 120L of water at 250C ( ρ = 997 kg/m3, CP = 4.18 kJ/kg0C). A 50kg copper block (CP = 0.386 kJ/kg0C) initially at 800C is dropped into water. Total entropy change for this process will be:-- a)3.344 kJ/K
- b)0.204 kJ/K
- c)3.104 kJ/K
- d)6.448 kJ/K
Correct answer is option 'B'. Can you explain this answer?
An insulated tank contains 120L of water at 250C ( ρ = 997 kg/m3, CP = 4.18 kJ/kg0C). A 50kg copper block (CP = 0.386 kJ/kg0C) initially at 800C is dropped into water. Total entropy change for this process will be:-
a)
3.344 kJ/K
b)
0.204 kJ/K
c)
3.104 kJ/K
d)
6.448 kJ/K
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