Mechanical Engineering
For a circular column having its ends hinged, the slenderness ratio is 160. The L/d ratio of the column is- a)80
- b)57
- c)40
- d)20
Correct answer is option 'C'. Can you explain this answer?
For a circular column having its ends hinged, the slenderness ratio is 160. The L/d ratio of the column is
a)
80
b)
57
c)
40
d)
20
Gokula Nand Joshi answered • 10 hours agoSlenderness ratio, 
where r is the least radius of gyration and Leff is effective length
∴
where r is the least radius of gyration and Leff is effective length
∴
In a thick cylinder pressurized from inside, the hoop stress is maximum at- a)the centre of the wall thickness
- b)the outer radius
- c)the inner radius
- d)both the inner and the outer rad
Correct answer is option 'C'. Can you explain this answer?
In a thick cylinder pressurized from inside, the hoop stress is maximum at
a)
the centre of the wall thickness
b)
the outer radius
c)
the inner radius
d)
both the inner and the outer rad
Pathways Academy answered • 10 hours agoHoop stress, 
Hence hoop stress will be maximum at inner radius and minimum at outer radius.
Hence hoop stress will be maximum at inner radius and minimum at outer radius.
A thick-walled hollow cylinder having outside and inside radii of 90 mm and 40 mm respectively is subjected to an external pressure of 800 MN/m2. The maximum circumferential stress in the cylinder will occur at a radius of- a)40 mm
- b)60 mm
- c)65 mm
- d)90 mm
Correct answer is option 'A'. Can you explain this answer?
A thick-walled hollow cylinder having outside and inside radii of 90 mm and 40 mm respectively is subjected to an external pressure of 800 MN/m2. The maximum circumferential stress in the cylinder will occur at a radius of
a)
40 mm
b)
60 mm
c)
65 mm
d)
90 mm
Manish Aggarwal answered • 10 hours agoThe maximum hoop stress will always occurs at inner most radii irrespective of the location of pressure.
A material has identical properties in all directions, it is said to be- a)homogeneous
- b)isotropic
- c)elastic
- d)orthotropic
Correct answer is option 'B'. Can you explain this answer?
A material has identical properties in all directions, it is said to be
a)
homogeneous
b)
isotropic
c)
elastic
d)
orthotropic
RENUKA SARVAN answered • 10 hours agoIsotropy is the property in which material posses same properties any where within it.
Toughness for mild steel under uniaxial tensile loading is given by the shaded portion of the stress-strain diagram as shown in- a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
Toughness for mild steel under uniaxial tensile loading is given by the shaded portion of the stress-strain diagram as shown in
a)
b)
c)
d)
SAVITA KUMARI answered • 10 hours agoToughness is the ability of material to absorb the energy upto fracture point, i.e. toughness of material is the total area under stress-strain curve.
The material in which large deformation is possible before the absolute failure or rupture is termed as- a)brittle
- b)elastic
- c)ductile
- d)plastic
Correct answer is option 'C'. Can you explain this answer?
The material in which large deformation is possible before the absolute failure or rupture is termed as
a)
brittle
b)
elastic
c)
ductile
d)
plastic
SHANU VERMA answered • 10 hours agoDuctility is defined as the ability of the material to deform to a greater extent before the sign of crack, when it is subjected to tensile force. Ductile materials are those materials which deform plastically to a greater extent prior to fracture e.g. mild steel, copper and aluminium.
Ashish Goyal asked • 1 hour agoThe vapour pressure over the concave surface is- a)less than the vapour pressure over the plane surface
- b)equal to the vapour pressure over the plane surface
- c)greater than the vapour pressure over the plane surface
- d)zero
- e)none of the above
Correct answer is option 'A'. Can you explain this answer?
The vapour pressure over the concave surface is
a)
less than the vapour pressure over the plane surface
b)
equal to the vapour pressure over the plane surface
c)
greater than the vapour pressure over the plane surface
d)
zero
e)
none of the above
What are the materials which show direction dependent properties?- a)Homogeneous materials
- b)Viscoelastic materials
- c)Isotropic materials
- d)Anisotropic materials
Correct answer is option 'D'. Can you explain this answer?
What are the materials which show direction dependent properties?
a)
Homogeneous materials
b)
Viscoelastic materials
c)
Isotropic materials
d)
Anisotropic materials
CHAHAT JAGMOHAN answered • 10 hours agoAnisotropy is the property in which material possess different properties in different directions.
If the crushing stress in the material of a mild steel column is 3300 kg/cm2. Euler’s formula for crippling load is applicable for slenderness ratio equal to/greater than- a)40
- b)50
- c)60
- d)80
Correct answer is option 'D'. Can you explain this answer?
If the crushing stress in the material of a mild steel column is 3300 kg/cm2. Euler’s formula for crippling load is applicable for slenderness ratio equal to/greater than
a)
40
b)
50
c)
60
d)
80
SNEHLATA KULDEEP answered • 10 hours agoFor Euler’s formula to be applicable the critical stress must not exceed the proportional limit.
Now crushing stress in mild steel
= 3300 kg/cm2
= 330 N/mm2
But stress at proportional limit in mild steel
= 250 M/mm2
Euler’s buckling stress
λ = 88.55 ≈ 89
Thus slenderness ratio should be more than or equal to 89 ideally. Option (d) is the most close one.
Now crushing stress in mild steel
= 3300 kg/cm2
= 330 N/mm2
But stress at proportional limit in mild steel
= 250 M/mm2
Euler’s buckling stress
λ = 88.55 ≈ 89
Thus slenderness ratio should be more than or equal to 89 ideally. Option (d) is the most close one.
Select the proper sequence
1. Proportional limit
2. Elastic limit
3. Yielding
4. Failure- a)2 ,3 , 1 , 4
- b)2, 1 , 3 , 4
- c)1, 3, 2, 4
- d)1,2, 3, 4
Correct answer is option 'D'. Can you explain this answer?
Select the proper sequence
1. Proportional limit
2. Elastic limit
3. Yielding
4. Failure
1. Proportional limit
2. Elastic limit
3. Yielding
4. Failure
a)
2 ,3 , 1 , 4
b)
2, 1 , 3 , 4
c)
1, 3, 2, 4
d)
1,2, 3, 4
CHARU TEK answered • 10 hours ago
A: Proportional limit
B : Elastic limit
C : UYP
D: LYP
E: UTS
F: Rupture point
In electrolux refrigerator. - a) ammonia is absorbed in hydrogen
- b) ammonia is absorbed in water
- c) ammonia evaporates in hydrogen
- d) hydrogen evaporates in ammonia
Correct answer is option 'C'. Can you explain this answer?
In electrolux refrigerator.
a)
ammonia is absorbed in hydrogen
b)
ammonia is absorbed in water
c)
ammonia evaporates in hydrogen
d)
hydrogen evaporates in ammonia
MANDEEP KAUR answered • 10 hours agoCorrect Answer :- c
Explanation : In Electrolux refrigerator Ammonia evaporates in hydrogen.
The ammonia liquid leaving the condenser enters the evaporator and evaporates into the hydrogen at the low temperature corresponding to its low partial pressure. The mixture of ammonia and hydrogen passes to the absorber into which is also admitted water from the separator. The water absorbs the ammonia and the hydrogen returns to the evaporator. In the absorber the ammonia therefore passes from the ammonia circuit into water circuit as ammonia in water solution. This strong solution passes to the generator where it is heated and the vapor given off rises to the separator. The water with the vapor is separated out and a weak solution of ammonia is passed back to the absorber, thus completing the water circuit. The ammonia vapor rises from the separator to the condenser where it is condensed and then returned to the evaporator.
Sreenath Narayandas asked • 2 hours agoA strut 3 m long is 4 cm in diameter. One end of the strut is fixed while its other end is hinged. Find the safe compressive load for the member allowing a factor of safety of 3. take E = 210 GPa- a)58 kN
- b)29 kN
- c)19 kN
- d)10 kN
Correct answer is option 'C'. Can you explain this answer?
A strut 3 m long is 4 cm in diameter. One end of the strut is fixed while its other end is hinged. Find the safe compressive load for the member allowing a factor of safety of 3. take E = 210 GPa
a)
58 kN
b)
29 kN
c)
19 kN
d)
10 kN
Abhishek Govil asked • 2 hours agoThe moment of a force- a)is the turning effect produced by a force, on the body, on which it acts
- b)is equal to the product of force acting on the body and the perpendicular distance ofa point and the line of action of the force
- c)is equal to twice the area of the triangle, whose base is the line representing the forceand whose vertex is the point, about which the moment is taken
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
The moment of a force
a)
is the turning effect produced by a force, on the body, on which it acts
b)
is equal to the product of force acting on the body and the perpendicular distance ofa point and the line of action of the force
c)
is equal to twice the area of the triangle, whose base is the line representing the forceand whose vertex is the point, about which the moment is taken
d)
all of the above
(aba) is a simultaneous Eigen vector of 
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
Kirankesavareddy Naredla asked • 2 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
Shubham Pandey asked • 3 hours agoAssertion (A): Efficiency of a reversible engine operating between temperature limits T1 and T2 is maximum.Reason (R): Efficiency of a reversible engine is greater than that of an irreversible engine.- 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): Efficiency of a reversible engine operating between temperature limits T1 and T2 is maximum.
Reason (R): Efficiency of a reversible engine is greater than that of an irreversible engine.
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
Akshay Kumar asked • 3 hours agoCommon Data Questions (32 and 33):
A smooth flat plate with a sharp leading edge is placed along a gas free stream flowing at U = 10 m/s. The thickness of the boundary layer at section r-s is 10 mm, the breadth of the plate is 1 m (into the paper) and the density of the gas, p = 1.0 kg/m3 . Assume that the boundary layer is thin, two - dimensional, and follows a linear velocity distribution, u = U (y/δ), at the section r-s, where y is the height from plate.
Q. The mass flow rate in Kg/s accros the section q-r is... more
Common Data Questions (32 and 33):
A smooth flat plate with a sharp leading edge is placed along a gas free stream flowing at U = 10 m/s. The thickness of the boundary layer at section r-s is 10 mm, the breadth of the plate is 1 m (into the paper) and the density of the gas, p = 1.0 kg/m3 . Assume that the boundary layer is thin, two - dimensional, and follows a linear velocity distribution, u = U (y/δ), at the section r-s, where y is the height from plate.
A smooth flat plate with a sharp leading edge is placed along a gas free stream flowing at U = 10 m/s. The thickness of the boundary layer at section r-s is 10 mm, the breadth of the plate is 1 m (into the paper) and the density of the gas, p = 1.0 kg/m3 . Assume that the boundary layer is thin, two - dimensional, and follows a linear velocity distribution, u = U (y/δ), at the section r-s, where y is the height from plate.
Q. The mass flow rate in Kg/s accros the section q-r is
Abhay Tiwari asked • 4 hours agoWhich one of the following is represented by the area of the S.F diagram from one end upto a given location on the beam?- a)B.M. at the location
- b)Load at the location
- c)Slope at the location
- d)Deflection at the location
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is represented by the area of the S.F diagram from one end upto a given location on the beam?
a)
B.M. at the location
b)
Load at the location
c)
Slope at the location
d)
Deflection at the location
Umamaheswara Reddy asked • 5 hours agoCommon data for 8 & 9Beam 8m long fixed at both ends carries a UDL over whole span. Take EI = 9.5 × 109 kNmm. Find load intensity on beam:-Q. When maximum deflection should not exceed 1/400 of the span.- a)8 kN/m
- b)6.1 kN/m
- c)17.8 kN/m
- d)3 kN/m
Correct answer is option 'C'. Can you explain this answer?
Common data for 8 & 9
Beam 8m long fixed at both ends carries a UDL over whole span. Take EI = 9.5 × 109 kNmm. Find load intensity on beam:-
Q. When maximum deflection should not exceed 1/400 of the span.
a)
8 kN/m
b)
6.1 kN/m
c)
17.8 kN/m
d)
3 kN/m
Sakthivel M asked • 5 hours agoTapered roller bearings can take- a)radial load only
- b)axial load only
- c)both radial and axial load and the ratio of these being less than unity
- d)both radial and axial load and the ratio of these being greater than unity
Correct answer is option 'D'. Can you explain this answer?
Tapered roller bearings can take
a)
radial load only
b)
axial load only
c)
both radial and axial load and the ratio of these being less than unity
d)
both radial and axial load and the ratio of these being greater than unity
Abhishek Govil asked • 6 hours agoThe heat absorbed or rejected by the working substance is given bywhere ds = Increase or decrease of entropy
T = Absolute temperature, and
dQ= Heat absorbed or rejected- a)dQ = T.ds
- b)dQ = T/ds
- c)dQ = ds/T
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
The heat absorbed or rejected by the working substance is given by
where ds = Increase or decrease of entropy
T = Absolute temperature, and
dQ= Heat absorbed or rejected
T = Absolute temperature, and
dQ= Heat absorbed or rejected
a)
dQ = T.ds
b)
dQ = T/ds
c)
dQ = ds/T
d)
None of these
Raju Rakoti asked • 6 hours agoA hot metal piece kept in air cools from 80°C to 70°C in t1 seconds, from 70°C to 60°C in t2 seconds and from 60°C to 50°C in t3 seconds, then- a)t1 = t2 = t3
- b)t1 < t2 < t3
- c)t1 > t2 > t3
- d)t1, t2, t3 will depend upon material of hot piece.
Correct answer is option 'B'. Can you explain this answer?
A hot metal piece kept in air cools from 80°C to 70°C in t1 seconds, from 70°C to 60°C in t2 seconds and from 60°C to 50°C in t3 seconds, then
a)
t1 = t2 = t3
b)
t1 < t2 < t3
c)
t1 > t2 > t3
d)
t1, t2, t3 will depend upon material of hot piece.
Aadarsh Vikram asked • 6 hours agoAssertion (A): The change in availability of a system is equal to the change in the Gibbs function of the system at constant temperature and pressure.
Reason (R): The Gibbs function is useful when evaluating the availability of systems in which chemical reactions occur.- 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): The change in availability of a system is equal to the change in the Gibbs function of the system at constant temperature and pressure.
Reason (R): The Gibbs function is useful when evaluating the availability of systems in which chemical reactions occur.
Reason (R): The Gibbs function is useful when evaluating the availability of systems in which chemical reactions occur.
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
Aadarsh Vikram asked • 7 hours agoIf a two-mass system is dynamically equivalent to a rigid body, then the system will NOT satisfy the condition that the - a)Sum of the two masses must be equal to that of the rigid body
- b)Polar moment of inertia of the system should be equal to that of the rigid body
- c)Centre of gravity (c.g.) of the system should coincide with that of the rigid body
- d)Total moment of inertia about the axis through c.g. must be equal to that of the rigid body
Correct answer is option 'D'. Can you explain this answer?
If a two-mass system is dynamically equivalent to a rigid body, then the system will NOT satisfy the condition that the
a)
Sum of the two masses must be equal to that of the rigid body
b)
Polar moment of inertia of the system should be equal to that of the rigid body
c)
Centre of gravity (c.g.) of the system should coincide with that of the rigid body
d)
Total moment of inertia about the axis through c.g. must be equal to that of the rigid body
Abhishek Govil asked • 7 hours agoFor the stability of a floating body, under the influence of gravity alone, which of the followingis TRUE ?- a)Metacenter should be below centre of gravity
- b)Metacenter should be above centre of gravity
- c)Metacenter and centre of gravity must lie on the same horizontal line
- d)Metacenter and centre of gravity must lie on the same vertical line.
Correct answer is option 'B'. Can you explain this answer?
For the stability of a floating body, under the influence of gravity alone, which of the followingis TRUE ?
a)
Metacenter should be below centre of gravity
b)
Metacenter should be above centre of gravity
c)
Metacenter and centre of gravity must lie on the same horizontal line
d)
Metacenter and centre of gravity must lie on the same vertical line.
Chandralok Rajvanshi asked • 7 hours agoA flywheel is fitted to the crankshaft of an engine having 'E' amount of indicated work per revolution and permissible limits of co-efficient of fluctuation of energy and speed as Ke and Ks respectively.The kinetic energy of the flywheel is then given by... more
A flywheel is fitted to the crankshaft of an engine having 'E' amount of indicated work per revolution and permissible limits of co-efficient of fluctuation of energy and speed as Ke and Ks respectively.
The kinetic energy of the flywheel is then given by
POOJA DEVI asked • 8 hours agoThe condition of perfect vacuum, i.e., absolute zero pressure can be attained at- a)a temperature of - 273.16°C
- b)a temperature of 0°C
- c)a temperature of 273°K
- d)a negative pressure and 0°C temperature
- e)can't be attained
Correct answer is option 'A'. Can you explain this answer?
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
a)
a temperature of - 273.16°C
b)
a temperature of 0°C
c)
a temperature of 273°K
d)
a negative pressure and 0°C temperature
e)
can't be attained
Abhishek Govil asked • 9 hours agoStrain energy is the- a)energy stored in a body when strained within elastic limits
- b)energy stored in a body when strained upto the breaking of a specimen
- c)maximum strain energy which can be stored in a body
- d)proof resilience per unit volume of a material
Correct answer is option 'A'. Can you explain this answer?
Strain energy is the
a)
energy stored in a body when strained within elastic limits
b)
energy stored in a body when strained upto the breaking of a specimen
c)
maximum strain energy which can be stored in a body
d)
proof resilience per unit volume of a material
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
Aadarsh Vikram asked • 11 hours agoA beam is made up of two identical bars AB and BC, by hinging them together at B. The end A is built-in (cantilevered) and the end C is simply-supported. With the load P acting as shown, the bending moment at A is:
- a)Zero
- b)
- c)
- d)Indeterminate
Correct answer is option 'B'. Can you explain this answer?
A beam is made up of two identical bars AB and BC, by hinging them together at B. The end A is built-in (cantilevered) and the end C is simply-supported. With the load P acting as shown, the bending moment at A is:
a)
Zero
b)
c)
d)
Indeterminate
Sreenath Narayandas asked • 11 hours agoA full journal bearing has a normal diameter of 50 mm and a bearing length of 25 mm. The bearing supports a load of 3000 N and the speed of the journal is 3000 rpm, and the radial clearance specified as 0.04 mm. SAE 10 oil has been chosen at 60°C temperature. The viscosity is 0.014 pa-s. Determine the Sommerfeld number.- a) 0.114
- b) 6.84
- c) 9.114
- d) 0.456
Correct answer is option 'A'. Can you explain this answer?
A full journal bearing has a normal diameter of 50 mm and a bearing length of 25 mm. The bearing supports a load of 3000 N and the speed of the journal is 3000 rpm, and the radial clearance specified as 0.04 mm. SAE 10 oil has been chosen at 60°C temperature. The viscosity is 0.014 pa-s. Determine the Sommerfeld number.
a)
0.114
b)
6.84
c)
9.114
d)
0.456
Achuth Kumar Yelleti asked • 12 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
Rahul Kapoor asked • 12 hours agoWhile calculating the stress induced in a closed coil helical spring, Wahl's factor must be considered to account for - a)The curvature and stress concentration effect
- b)Shock loading
- c)Poor service conditions
- d)Fatigue loading
Correct answer is option 'A'. Can you explain this answer?
While calculating the stress induced in a closed coil helical spring, Wahl's factor must be considered to account for
a)
The curvature and stress concentration effect
b)
Shock loading
c)
Poor service conditions
d)
Fatigue loading
Hardik Barot asked • 13 hours agoA cylindrical elastic body subjected to pure torsion about its axis develops- a)tensile stress in a direction 45º to the axis
- b)no tensile or compressive stress
- c)maximum shear stress along the axis of the shaft
- d)Maximum shear stress at 45º to the axis
Correct answer is option 'A'. Can you explain this answer?
A cylindrical elastic body subjected to pure torsion about its axis develops
a)
tensile stress in a direction 45º to the axis
b)
no tensile or compressive stress
c)
maximum shear stress along the axis of the shaft
d)
Maximum shear stress at 45º to the axis
Chandan Patel 007 asked • 13 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%
Mahesh Kumar asked • 13 hours agoThe use of Refrigerant R–22 for temperature below – 30º is not recommended due to its- a)good miscibility with lubricating oil
- b)poor miscibility with lubricating oil
- c)low evaporating temperature
- d)high compressor discharge temperature
Correct answer is option 'D'. Can you explain this answer?
The use of Refrigerant R–22 for temperature below – 30º is not recommended due to its
a)
good miscibility with lubricating oil
b)
poor miscibility with lubricating oil
c)
low evaporating temperature
d)
high compressor discharge temperature
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
Sundar Raj asked • 14 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:
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
Sandeep Prajapati asked • 15 hours agoTwo shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that- a)shaft B is better than shaft A
- b)shaft A is better than shaft B
- c)both the shafts are equally good
Correct answer is option 'A'. Can you explain this answer?
Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that
a)
shaft B is better than shaft A
b)
shaft A is better than shaft B
c)
both the shafts are equally good
Anil Gangwar asked • 15 hours agoNeglecting changes in kinetic energy and potential energy, for unit mass the availability in a non-flow process becomes 
where ɸ is the availability function of the - a)Open system
- b)Closed system
- c)Isolated system
- d)Steady flow process
Correct answer is option 'A'. Can you explain this answer?
Neglecting changes in kinetic energy and potential energy, for unit mass the availability in a non-flow process becomes where ɸ is the availability function of the
where ɸ is the availability function of the a)
Open system
b)
Closed system
c)
Isolated system
d)
Steady flow process
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