Mechanical Engineering
The value of Biot number is very small (less then 0.1)- a)the convective resistance of fluid is negligible
- b)the conductive resistance of the fluid is negligible
- c)the conductive resistance of the solid is negligible
- d)none of these
Correct answer is option 'C'. Can you explain this answer?
The value of Biot number is very small (less then 0.1)
a)
the convective resistance of fluid is negligible
b)
the conductive resistance of the fluid is negligible
c)
the conductive resistance of the solid is negligible
d)
none of these
SANSKAR ANAND answered • 3 hours agoSince Biot number is the ratio of conduction resistance to convection resistance and in lumped heat analysis convection resistance ≫ conduction resistance, it means that conduction resistance of solid is negligible as compared to convection resistance of fluid.
The effectiveness of a fin will be maximum in an environment with- a)free convection
- b)forced convection
- c)radiation
- d)convection and radiation
Correct answer is option 'A'. Can you explain this answer?
The effectiveness of a fin will be maximum in an environment with
a)
free convection
b)
forced convection
c)
radiation
d)
convection and radiation
ANSHAD M answered • 3 hours agoEffectiveness of the fin is given by
Hence, Effectiveness of the fin will be more in free convection than forced convection.
Hence, Effectiveness of the fin will be more in free convection than forced convection.
A float valve of the ‘ball-cock’ type required to close an opening of a supply pipe feeding a cistern as shown in the given figure
The buoyant force FB required to be exerted by the float to keep the valve closed against a pressure of 0.28 N/mm2 is- a)4.4 N
- b)5.6 N
- c)7.5 N
- d)9,2 N
Correct answer is option 'A'. Can you explain this answer?
A float valve of the ‘ball-cock’ type required to close an opening of a supply pipe feeding a cistern as shown in the given figure
The buoyant force FB required to be exerted by the float to keep the valve closed against a pressure of 0.28 N/mm2 is
The buoyant force FB required to be exerted by the float to keep the valve closed against a pressure of 0.28 N/mm2 is
a)
4.4 N
b)
5.6 N
c)
7.5 N
d)
9,2 N
VIVEK KUMAR answered • 3 hours agoTaking moment about hinge We get
A siphon used to empty a tank consists essentially of a pipe with its summit 0.5 m above the water surface of the tank and its outlet at 2.5 m below the summit. Neglecting friction and other losses, the velocity in the siphon is- a)5.26 m/s
- b)6.26 m/s
- c)7 m/s
- d)6.5 m/s
Correct answer is option 'B'. Can you explain this answer?
A siphon used to empty a tank consists essentially of a pipe with its summit 0.5 m above the water surface of the tank and its outlet at 2.5 m below the summit. Neglecting friction and other losses, the velocity in the siphon is
a)
5.26 m/s
b)
6.26 m/s
c)
7 m/s
d)
6.5 m/s
RAHUL KUMAR answered • 3 hours ago
E, G, K and μ represent the elastic modulus, shear modulus, bulk modulus and -Poisson's ratio respectively of a linearly elastic, isotropic and homogeneous material. To express the stress strain relations completely for this material, at least- a)E, G and μ must be known
- b)E, K and μ must be known
- c)any two of the four must be known
- d)all the four must be known
Correct answer is option 'C'. Can you explain this answer?
E, G, K and μ represent the elastic modulus, shear modulus, bulk modulus and -Poisson's ratio respectively of a linearly elastic, isotropic and homogeneous material. To express the stress strain relations completely for this material, at least
a)
E, G and μ must be known
b)
E, K and μ must be known
c)
any two of the four must be known
d)
all the four must be known
SANDEEP MAHARANA answered • 3 hours agoE = 2G(1 + μ) ...(i)
E = 3K (1 - 2μ) ...(ii)
In this cae there are four unknown quantities and only two equation are available. Hence any two of the four unknown quantities must be known for complete stress relationship.
E = 3K (1 - 2μ) ...(ii)
In this cae there are four unknown quantities and only two equation are available. Hence any two of the four unknown quantities must be known for complete stress relationship.
The maximum values of Poisson’s ratio for an elastic material is- a)0.25
- b)0.5
- c)0.75
- d)1.0
Correct answer is option 'B'. Can you explain this answer?
The maximum values of Poisson’s ratio for an elastic material is
a)
0.25
b)
0.5
c)
0.75
d)
1.0
NEERAJ KUMAR answered • 3 hours agoPoisson’s ratio lies between 0 to 0.5.
μ = 0.5 for pure elastic rubber
μ = 0.1 to 0.2 for concrete
μ = 0.25 to 0.33 for steel
μ = 0.5 for pure elastic rubber
μ = 0.1 to 0.2 for concrete
μ = 0.25 to 0.33 for steel
Raju Kumar asked • 25 minutes agoAn elastic material of Young‟s modulus E and Poisson‟s ratio ν is subjected to a compressive stress of σ1 in the longitudinal direction. Suitable lateral compressive stress σ 2 are also applied along the other two each of the lateral directions to half of the magnitude that would be under σ1 acting alone. The magnitude of σ2 is... more
An elastic material of Young‟s modulus E and Poisson‟s ratio ν is subjected to a compressive stress of σ1 in the longitudinal direction. Suitable lateral compressive stress σ 2 are also applied along the other two each of the lateral directions to half of the magnitude that would be under σ1 acting alone. The magnitude of σ2 is
Circulation of water is by natural convection currents in- a)LaMont boiler
- b)Benson boiler
- c)Velox boiler
- d)Babcock-Wiicox boiler
Correct answer is option 'D'. Can you explain this answer?
Circulation of water is by natural convection currents in
a)
LaMont boiler
b)
Benson boiler
c)
Velox boiler
d)
Babcock-Wiicox boiler
KSHIT RAJ answered • 3 hours agoLaMont, Benson and Veiox are high pressure boilers which use in external pump to force wate or steam through the boiler circuit independen of natural circulation due to static head anc convection currents.
Rahul Kapoor asked • 28 minutes agoFrom design point of view, spherical pressure vessels are preferred over cylindrical pressure vessels because they- a)Are cost effective in fabrication
- b)Have uniform higher circumferential stress
- c)Uniform lower circumferential stress
- d)Have a larger volume for the same quantity of material used
Correct answer is option 'D'. Can you explain this answer?
From design point of view, spherical pressure vessels are preferred over cylindrical pressure vessels because they
a)
Are cost effective in fabrication
b)
Have uniform higher circumferential stress
c)
Uniform lower circumferential stress
d)
Have a larger volume for the same quantity of material used
If Pa and Pv denote respectively the partial pressure of dry air and that of water vapour in moist air, the specific humidity of air is given by- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
If Pa and Pv denote respectively the partial pressure of dry air and that of water vapour in moist air, the specific humidity of air is given by
a)
b)
c)
d)
SINGH AMIT answered • 3 hours agoAssuming that the dry air and water vapour behaves as perfect gases, we have for dry
For water vapour
Also
Ra = 0.287 kJ/kgK (for dry air)
Rv = 0.461 kJ/kgK (for water vapour)
For water vapour
Also
Ra = 0.287 kJ/kgK (for dry air)
Rv = 0.461 kJ/kgK (for water vapour)
A tapering bar (diameter of end sections being, d1 and d2) and a bar of uniform cross-section, 'd' have the same length and are subjected to the same axial pull. Both the bars will have the same extension if ‘d’ is equal to- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
A tapering bar (diameter of end sections being, d1 and d2) and a bar of uniform cross-section, 'd' have the same length and are subjected to the same axial pull. Both the bars will have the same extension if ‘d’ is equal to
a)
b)
c)
d)
MD AAMIR answered • 3 hours ago
A shaft subjected to torsion experiences a pure shear stress τ on the surface. The maximum principal stress on the surface which is at 45° to the axis will have a value of- a)τ cos 45°
- b)2τ cos 45°
- c)τ cos2 45°
- d)2τ sin 45° cos 45°
Correct answer is option 'D'. Can you explain this answer?
A shaft subjected to torsion experiences a pure shear stress τ on the surface. The maximum principal stress on the surface which is at 45° to the axis will have a value of
a)
τ cos 45°
b)
2τ cos 45°
c)
τ cos2 45°
d)
2τ sin 45° cos 45°
SAHIL KUNDRA answered • 3 hours ago
In a plane stress problem there are normal tensile stresses σx and σy accompanied by shear stres τxy at a point along orthogonal Cartesian co-ordinates x and y respectively. If it is observed that the minimum principal stress on a certain plane is zero then,- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
In a plane stress problem there are normal tensile stresses σx and σy accompanied by shear stres τxy at a point along orthogonal Cartesian co-ordinates x and y respectively. If it is observed that the minimum principal stress on a certain plane is zero then,
a)
b)
c)
d)
YASHWANT KUMAR answered • 14 hours agoPrincipal stresses,
Since minimum principal stress is zero, so
Since minimum principal stress is zero, so
Siva Arumugam asked • 2 hours agoDistortion energy theorem is not recommended for ductile materials?
A beam 3 meters in length is simply supported at its ends and carries a point load W at its center. If the slope at the ends is not to exceed 1 °(0.01745 radian), the limiting deflection at the center of beam would be- a)8.75 mm
- b)17.5 mm
- c)26.0 mm.
- d)35.0 mm
Correct answer is option 'B'. Can you explain this answer?
A beam 3 meters in length is simply supported at its ends and carries a point load W at its center. If the slope at the ends is not to exceed 1 °(0.01745 radian), the limiting deflection at the center of beam would be
a)
8.75 mm
b)
17.5 mm
c)
26.0 mm.
d)
35.0 mm
DEBARSHI HALDER answered • 14 hours ago
∴
= 17.45 mm
Which is not the advantage of wet friction clutch?- a)high coefficient of friction
- b)simplicity of sealing
- c)greater operating life
- d)smoothness in operation and engagement
Correct answer is option 'A'. Can you explain this answer?
Which is not the advantage of wet friction clutch?
a)
high coefficient of friction
b)
simplicity of sealing
c)
greater operating life
d)
smoothness in operation and engagement
RAHUL KUMAR answered • 14 hours ago• The we friction is about one-third of dry friction clutch.
• The torque capacity of dry clutch is more as compared with the torque capacity of wet clutch of the same dimensions.
• In wet clutches, the lubricating oil carries away the frictional heat.
• The torque capacity of dry clutch is more as compared with the torque capacity of wet clutch of the same dimensions.
• In wet clutches, the lubricating oil carries away the frictional heat.
Identify the type of rivet head usually used for boiler plate riveting:- a)pan head
- b)snap head
- c)counter sunk head
- d)conical head
Correct answer is option 'B'. Can you explain this answer?
Identify the type of rivet head usually used for boiler plate riveting:
a)
pan head
b)
snap head
c)
counter sunk head
d)
conical head
SUDHANSHU SHARMA answered • 14 hours agoThe snap heads are usually employed for structural work and machine riveting. The counter sunk heads are mainly used for ship building where flat surfaces are necessary. The conical heads (also known as conidal heads) are mainly used in case of hand hammering. The pan heads have maximum strength, but these are difficult to shape.
In a multiple disc clutch n1 and n2 are the number of discs on the driving and driven shafts respectively. The number of pair of contact surfaces will be- a)n1 + n2
- b)n1 + n2 - 1
- c)n1 + n1 + 1
- d)
Correct answer is option 'B'. Can you explain this answer?
In a multiple disc clutch n1 and n2 are the number of discs on the driving and driven shafts respectively. The number of pair of contact surfaces will be
a)
n1 + n2
b)
n1 + n2 - 1
c)
n1 + n1 + 1
d)
SUYASH AGRAWAL answered • 14 hours agoNumber of pair in contact = n1 + n2 - 1
Particle A makes a perfectly elastic collision with another particle B at rest. They fly apart in opposite direction with equal speeds. The ratio of their masses 
is- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
Particle A makes a perfectly elastic collision with another particle B at rest. They fly apart in opposite direction with equal speeds. The ratio of their masses is
isa)
b)
c)
d)
NEERAJ DUBEY answered • 14 hours agom1 = mA, m2 = mB, u1 = u, u2 = 0, v1 =v, v2 = - v
By principle of conservation of linear momentum.
m1 u 0 = m1 V m2 (-v) = (m1 – m2) v
By principle of conservation of K.E.
By principle of conservation of linear momentum.
m1 u 0 = m1 V m2 (-v) = (m1 – m2) v
By principle of conservation of K.E.
Sai Teja asked • 4 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
Chandan Patel 007 asked • 5 hours agoConsider the following Linear Programming Problem (LPP):
Maximize z = 3x1 + 2x2
Subject to x1 ≤ 4
x2 ≤ 6
3x1 + x2 ≤ 18
x2 ≥ 0, x2 ≥ 0 - a)The LPP has a unique optimal solution
- b)The LPP is infeasible
- c)The LPP is unbounded
- d)The LPP has multiple optimal solutions.
Correct answer is option 'A'. Can you explain this answer?
Consider the following Linear Programming Problem (LPP):
Maximize z = 3x1 + 2x2
Subject to x1 ≤ 4
x2 ≤ 6
3x1 + x2 ≤ 18
x2 ≥ 0, x2 ≥ 0
Maximize z = 3x1 + 2x2
Subject to x1 ≤ 4
x2 ≤ 6
3x1 + x2 ≤ 18
x2 ≥ 0, x2 ≥ 0
a)
The LPP has a unique optimal solution
b)
The LPP is infeasible
c)
The LPP is unbounded
d)
The LPP has multiple optimal solutions.
DEEPA KUMARI asked • 5 hours agoAn accumulator has a ram of 250 mm in diameter. The effective stroke of the ram is 3 m and the total load on the ram is 300 kN. The frictional effects in the accumulator can be taken as 2% of the total load on the ram. What is the total power delivered by the accumulator when ram falls through its full stroke in 49 seconds?- a)10 kW
- b)13 kW
- c)15 kW
- d)18 kW
Correct answer is option 'D'. Can you explain this answer?
An accumulator has a ram of 250 mm in diameter. The effective stroke of the ram is 3 m and the total load on the ram is 300 kN. The frictional effects in the accumulator can be taken as 2% of the total load on the ram. What is the total power delivered by the accumulator when ram falls through its full stroke in 49 seconds?
a)
10 kW
b)
13 kW
c)
15 kW
d)
18 kW
Kasireddyganeshreddy Red asked • 6 hours agoCarbonisation of coal is the process of- a)pulverising coal in inert atmosphere
- b)heating wood in a limited supply of air at temperatures below 300ºC
- c)strongly heating coal continuously or about 48 hours in the absence of air in a closed vessel
- d)binding the pulverised coal into bricketters
- e)enriching carbon in the coal
Correct answer is option 'C'. Can you explain this answer?
Carbonisation of coal is the process of
a)
pulverising coal in inert atmosphere
b)
heating wood in a limited supply of air at temperatures below 300ºC
c)
strongly heating coal continuously or about 48 hours in the absence of air in a closed vessel
d)
binding the pulverised coal into bricketters
e)
enriching carbon in the coal
Abhishek Govil asked • 7 hours agoThe tool life is said to be over if- a)poor surface finish is obtained
- b)there is sudden increase in cutting forces and power consumption
- c)overheating and fuming due to heat of friction starts
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
The tool life is said to be over if
a)
poor surface finish is obtained
b)
there is sudden increase in cutting forces and power consumption
c)
overheating and fuming due to heat of friction starts
d)
all of the above
Abhishek Govil asked • 8 hours agoConsider the following joints:
1. Railway carriage wheel and axle
2. IC engine cylinder and liner
which of the above joints is /are the result (s) of interference fit ?- a)1 Only
- b)2 Only
- c)Neither 1 nor 2
- d)Both 1 and 2
Correct answer is option 'A'. Can you explain this answer?
Consider the following joints:
1. Railway carriage wheel and axle
2. IC engine cylinder and liner
which of the above joints is /are the result (s) of interference fit ?
1. Railway carriage wheel and axle
2. IC engine cylinder and liner
which of the above joints is /are the result (s) of interference fit ?
a)
1 Only
b)
2 Only
c)
Neither 1 nor 2
d)
Both 1 and 2
Nalini G asked • 9 hours agoAssertion (A): In sheet metal blanking operation, clearance must be given to the die.
Reason (R): The blank should be of required dimensions.- 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 'D'. Can you explain this answer?
Assertion (A): In sheet metal blanking operation, clearance must be given to the die.
Reason (R): The blank should be of required dimensions.
Reason (R): The blank should be of required dimensions.
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
Kirankesavareddy Naredla asked • 9 hours agoConsider the following statements for a throttling process:1. It is an adiabatic process.2. There is no work transfer in the process.3. Entropy increases in throttling processWhich of these statements are correct ?- a)1, 2 and 3
- b)1 and 2 only
- c)2 and 3 only
- d)1 and 3 only
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements for a throttling process:
1. It is an adiabatic process.
2. There is no work transfer in the process.
3. Entropy increases in throttling process
Which of these statements are correct ?
a)
1, 2 and 3
b)
1 and 2 only
c)
2 and 3 only
d)
1 and 3 only
full depth involute tooth
stub tooth
Ankit Singh asked • 9 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
Mayur Chawla asked • 11 hours agoTo restore stable operating condition in a hydrodynamic journal bearing, when it encounters higher magnitude loads, - a)Oil viscosity is to be decreased
- b)oil viscosity is to be increased
- c)Oil viscosity index is to be increased
- d)oil viscosity index is to be decreased
Correct answer is option 'B'. Can you explain this answer?
To restore stable operating condition in a hydrodynamic journal bearing, when it encounters higher magnitude loads,
a)
Oil viscosity is to be decreased
b)
oil viscosity is to be increased
c)
Oil viscosity index is to be increased
d)
oil viscosity index is to be decreased
Pk Patel asked • 11 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
Praveen Kumar asked • 11 hours agoIn the design of connecting rod small end bearing, the value of permissible bearing pressure to be used is :- a)Less than that used for big end bearing
- b)More than that used for big end bearing
- c)Equal to that used for big end bearing
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
In the design of connecting rod small end bearing, the value of permissible bearing pressure to be used is :
a)
Less than that used for big end bearing
b)
More than that used for big end bearing
c)
Equal to that used for big end bearing
d)
None of the above
Shivam Saxena asked • 12 hours agoConsider the following statements: 1. The degree of freedom for lower kinematic pairs is always equal to one.
2. A ball-and-socket joint has 3 degrees of freedom and is a higher kinematic pair
3.Oldham's coupling mechanism has two prismatic pairs and two revolute pairs.Which of the statements given above is/are correct?[IES-2005]- a)1, 2 and 3
- b)1 only
- c)2 and 3
- d)3 only
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements:
1. The degree of freedom for lower kinematic pairs is always equal to one.
2. A ball-and-socket joint has 3 degrees of freedom and is a higher kinematic pair
3.Oldham's coupling mechanism has two prismatic pairs and two revolute pairs.
2. A ball-and-socket joint has 3 degrees of freedom and is a higher kinematic pair
3.Oldham's coupling mechanism has two prismatic pairs and two revolute pairs.
Which of the statements given above is/are correct?
[IES-2005]
a)
1, 2 and 3
b)
1 only
c)
2 and 3
d)
3 only
Ankur Pandey asked • 12 hours agoWhich one of the following loadings is considered for design of axles ?
- a) Bending moment only
- b) Twisting moment only
- c) Combined bending moment and torsion
- d) Combined action of bending moment, twisting moment and axial thrust
Correct answer is option 'A'. Can you explain this answer?
Which one of the following loadings is considered for design of axles ?
a)
Bending moment onlyb)
Twisting moment onlyc)
Combined bending moment and torsiond)
Combined action of bending moment, twisting moment and axial thrust 
Micky Kumar asked • 13 hours agoA beam with a rectangular section of 120 mm × 60 mm, designed to be placed vertically is placed horizontally by mistake. If the maximum stress is to be limited, the reduction in load carrying capacity would be - a)1/4
- b)1/3
- c)1/2
- d)1/6
Correct answer is option 'C'. Can you explain this answer?
A beam with a rectangular section of 120 mm × 60 mm, designed to be placed vertically is placed horizontally by mistake. If the maximum stress is to be limited, the reduction in load carrying capacity would be
a)
1/4
b)
1/3
c)
1/2
d)
1/6
Abhishek Govil asked • 13 hours agoThe total energy of a liquid particle in motion is equal to- a)pressure energy + kinetic energy + potential energy
- b)pressure energy – (kinetic energy + potential energy)
- c)Potential energy – (Pressure energy + kinetic energy)
- d)kinetic energy – (pressure energy + potential energy)
Correct answer is option 'A'. Can you explain this answer?
The total energy of a liquid particle in motion is equal to
a)
pressure energy + kinetic energy + potential energy
b)
pressure energy – (kinetic energy + potential energy)
c)
Potential energy – (Pressure energy + kinetic energy)
d)
kinetic energy – (pressure energy + potential energy)
Abhishek Govil asked • 13 hours agoFor two governors A and B, the lift of sleeve of governor A is more than that of governor B, fora given fractional change in speed. It indicates that- a)governor A is more sensitive than governor B
- b)governor B is more sensitive than governor A
- c)both governor A and B are equally sensitive
- d)none of the above
Correct answer is option 'A'. Can you explain this answer?
For two governors A and B, the lift of sleeve of governor A is more than that of governor B, fora given fractional change in speed. It indicates that
a)
governor A is more sensitive than governor B
b)
governor B is more sensitive than governor A
c)
both governor A and B are equally sensitive
d)
none of the above
Akshay Karma asked • 13 hours agoConsider the following statements:
1. Availability is generally conserved
2. Availability can either be negative or positive
3. Availability is the maximum theoretical work obtainable
4. Availability can be destroyed in irreversibilityWhich of these statements are correct?- a)3 and 4
- b)1 and 2
- c)l and 3
- d)2 and 4
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements:
1. Availability is generally conserved
2. Availability can either be negative or positive
3. Availability is the maximum theoretical work obtainable
4. Availability can be destroyed in irreversibility
1. Availability is generally conserved
2. Availability can either be negative or positive
3. Availability is the maximum theoretical work obtainable
4. Availability can be destroyed in irreversibility
Which of these statements are correct?
a)
3 and 4
b)
1 and 2
c)
l and 3
d)
2 and 4
Daniyal Zahid asked • 13 hours agoFor the double long shoe, external drum brake illustrated in the figure (All dimensions are in mm), the face width of the shoes is 30 mm. the coefficient of friction between the shoe and the drum can be taken as 0.28.
Q.Determine the actuation load on the left-had shoe when the pressure on the brake lining does not exceed 1.4 MPa- a) 3961 N
- b) 3266 N
- c) 1243 N
- d) 2004 N
Correct answer is option 'D'. Can you explain this answer?
For the double long shoe, external drum brake illustrated in the figure (All dimensions are in mm), the face width of the shoes is 30 mm. the coefficient of friction between the shoe and the drum can be taken as 0.28.
Q.
Determine the actuation load on the left-had shoe when the pressure on the brake lining does not exceed 1.4 MPa
a)
3961 N
b)
3266 N
c)
1243 N
d)
2004 N
Sundar Raj asked • 13 hours agoCommon Data for Questions
Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and is the warmer one being maintained at 727°C, the lower plate (plate 2) is a diffuse and gray surface with an emissivity of 0.7 and is kept at 227°C.
Assume that the surfaces are sufficiently large to form a two-surface enclosure and steady-state conditions to exist. Stefan-Boltzmann constant is given as 5.67 × 10-8 W/m2K4.Q. If plate 1 is also a diffuse and gray surface with an emissivity value of 0.8, the net radiation heat exchange (in kW/m2) between plate 1 and plate 2 is: ... more
Common Data for Questions
Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and is the warmer one being maintained at 727°C, the lower plate (plate 2) is a diffuse and gray surface with an emissivity of 0.7 and is kept at 227°C.
Assume that the surfaces are sufficiently large to form a two-surface enclosure and steady-state conditions to exist. Stefan-Boltzmann constant is given as 5.67 × 10-8 W/m2K4.
Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and is the warmer one being maintained at 727°C, the lower plate (plate 2) is a diffuse and gray surface with an emissivity of 0.7 and is kept at 227°C.
Assume that the surfaces are sufficiently large to form a two-surface enclosure and steady-state conditions to exist. Stefan-Boltzmann constant is given as 5.67 × 10-8 W/m2K4.
Q. If plate 1 is also a diffuse and gray surface with an emissivity value of 0.8, the net radiation heat exchange (in kW/m2) between plate 1 and plate 2 is:
Rohan Pal asked • 13 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
Prakash Kumar asked • 13 hours agoIn a new temperature scale say of the boiling and freezing point of water at one atmosphere are 100º f and 300º f respectively, corelate this scale with centrigate scale. The reading of 0º f on the centrigate scale is- a)0 ºC
- b)100 ºC
- c)50 ºC
- d)150 ºC
Correct answer is option 'D'. Can you explain this answer?
In a new temperature scale say of the boiling and freezing point of water at one atmosphere are 100º f and 300º f respectively, corelate this scale with centrigate scale. The reading of 0º f on the centrigate scale is
a)
0 ºC
b)
100 ºC
c)
50 ºC
d)
150 ºC
Pooja Shende asked • 14 hours agoA system at a given state undergoes change through the following expansion processes to reach the same final volume1. Isothermal2. Isobaric3. Adiabatic ( γ = 1.4)4. Polytropic(n =1.3)The correct ascending order of the work output in these four processes is- a)3, 4, 1, 2
- b)1, 4, 3, 2
- c)4, 1, 3, 2
- d)4, 1, 2, 3
Correct answer is option 'A'. Can you explain this answer?
A system at a given state undergoes change through the following expansion processes to reach the same final volume
1. Isothermal
2. Isobaric
3. Adiabatic ( γ = 1.4)
4. Polytropic(n =1.3)
The correct ascending order of the work output in these four processes is
a)
3, 4, 1, 2
b)
1, 4, 3, 2
c)
4, 1, 3, 2
d)
4, 1, 2, 3
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