Mechanical Engineering
The process of shot peening increases the fatigue life of steel springs mainly because it results in[1990]- a)surface hardening
- b)increased stiffness of the material
- c)structural changes in the material
- d)residual compression at the surface
Correct answer is option 'D'. Can you explain this answer?
The process of shot peening increases the fatigue life of steel springs mainly because it results in
[1990]
a)
surface hardening
b)
increased stiffness of the material
c)
structural changes in the material
d)
residual compression at the surface
Pathways Academy answered • 4 hours agoShot preening increases fatigue life of springs
The yield strength of a steel shaft is twice its endurance limit. Which of the following torque fluctuations represent the most critical situation according to Soderberg criterion?[1993]- a)– T to + T
- b)–T/2 to + T
- c)0 to + T
- d)+ T/2 to + T
Correct answer is option 'A'. Can you explain this answer?
The yield strength of a steel shaft is twice its endurance limit. Which of the following torque fluctuations represent the most critical situation according to Soderberg criterion?
[1993]
a)
– T to + T
b)
–T/2 to + T
c)
0 to + T
d)
+ T/2 to + T
Pathways Academy answered • 4 hours ago
τa is highest in (a)
A cylindrical shaft is subjected to an alternating stress of 100 MPa. Fatigue strength to sustain 1000 cycles is 490 MPa. If the corrected endurance strength is 70 MPa, estimated shaft life will be[2006]- a)1071 cycles
- b)15000 cycles
- c)281914 cycles
- d)928643 cycles
Correct answer is option 'C'. Can you explain this answer?
A cylindrical shaft is subjected to an alternating stress of 100 MPa. Fatigue strength to sustain 1000 cycles is 490 MPa. If the corrected endurance strength is 70 MPa, estimated shaft life will be
[2006]
a)
1071 cycles
b)
15000 cycles
c)
281914 cycles
d)
928643 cycles
Manish Aggarwal answered • 4 hours ago
By concept of straight line,
At y = 2
⇒ x = 5.4501
log10N = 5.4501, N = 281914
At y = 2
⇒ x = 5.4501
log10N = 5.4501, N = 281914
The input link O2P of a four bar linkage is rotated at 2 rad/s in counter clockwise direction as shown below. The angular velocity of the coupler PQ in rad/s, at an instant when ∠O4O2P = 180°, is
[2007]- a)4
- b)2√2
- c)1
- d)1√2
Correct answer is option 'C'. Can you explain this answer?
The input link O2P of a four bar linkage is rotated at 2 rad/s in counter clockwise direction as shown below. The angular velocity of the coupler PQ in rad/s, at an instant when ∠O4O2P = 180°, is
[2007]
a)
4
b)
2√2
c)
1
d)
1√2
Manish Aggarwal answered • 4 hours ago
Now,
Vrushabh Jain Jain asked • 10 minutes agoConsidering the relationship TdS = dU + pdV between the entropy (S), internal energy (U), pressure (p), temperature (T) and volume (V), which of the following statements is correct?- a)It is applicable only for a reversible process
- b)For an irreversible process, TdS > dU + pdV
- c)It is valid only for an ideal gas
- d)It is equivalent to 1 law, for a reversible process
Correct answer is option 'D'. Can you explain this answer?
Considering the relationship TdS = dU + pdV between the entropy (S), internal energy (U), pressure (p), temperature (T) and volume (V), which of the following statements is correct?
a)
It is applicable only for a reversible process
b)
For an irreversible process, TdS > dU + pdV
c)
It is valid only for an ideal gas
d)
It is equivalent to 1 law, for a reversible process
A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. The diameter of the die should be (Take clearance as 3% of sheet thickness) _______.[ME 1996]- a)49.925 mm
- b)50.00 mm
- c)50.075 mm
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. The diameter of the die should be (Take clearance as 3% of sheet thickness) _______.
[ME 1996]
a)
49.925 mm
b)
50.00 mm
c)
50.075 mm
d)
None of these
Telecom Tuners answered • 4 hours agoClearness should be given on punch in Blanking operation. Die should be exact.
At small variations of arc length at operating conditions, the manual metal arc welding transformer provides nearly[ME 1990]- a)Constant power
- b)Constant power factor
- c)Constant voltage
- d)Constant current
Correct answer is option 'D'. Can you explain this answer?
At small variations of arc length at operating conditions, the manual metal arc welding transformer provides nearly
[ME 1990]
a)
Constant power
b)
Constant power factor
c)
Constant voltage
d)
Constant current
Telecom Tuners answered • 4 hours agoConstant current type of transformer is used in Manual Arc welding otherwise weld bead of irregular shape and penetration
Mantu Das asked • 15 minutes agoA medium carbon steel workpiece is turned on a lath at 50 m/ min cutting speed, 0.8 mm/ revfeed and 1.5 mm depth of cut, what is the rate of metal removal- a)100 mm3/ min
- b)20000 mm3/min
- c)60000 mm3/ min
- d)Can not be calculated with the given data
Correct answer is option 'C'. Can you explain this answer?
A medium carbon steel workpiece is turned on a lath at 50 m/ min cutting speed, 0.8 mm/ revfeed and 1.5 mm depth of cut, what is the rate of metal removal
a)
100 mm3/ min
b)
20000 mm3/min
c)
60000 mm3/ min
d)
Can not be calculated with the given data
A solid steel cube constrained on all six faces is heated so that the temperature rises uniformly by ΔT. If the thermal coefficient of the material is α, Young's modulus is E and the Poisson's ratio is v , the thermal stress developed in the cube due to heating is[2012]- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
A solid steel cube constrained on all six faces is heated so that the temperature rises uniformly by ΔT. If the thermal coefficient of the material is α, Young's modulus is E and the Poisson's ratio is v , the thermal stress developed in the cube due to heating is
[2012]
a)
b)
c)
d)
Constructing Careers answered • 4 hours agoVolumetric strain
A long glass cylinder of inner diameter = 0.03 m and outer diameter = 0.05 m carries hot fluid inside. If the thermal conductivity of glass = 1.05 W/mK, the thermal resistance (K/W) per unit length of the cylinder is[2007]- a)0.031
- b)0.077
- c)0.17
- d)0.34
Correct answer is option 'B'. Can you explain this answer?
A long glass cylinder of inner diameter = 0.03 m and outer diameter = 0.05 m carries hot fluid inside. If the thermal conductivity of glass = 1.05 W/mK, the thermal resistance (K/W) per unit length of the cylinder is
[2007]
a)
0.031
b)
0.077
c)
0.17
d)
0.34
Constructing Careers answered • 4 hours agoGiven data:
d1 = 0.03 m
Thermal resistance
d1 = 0.03 m
Thermal resistance
Shrinivas Madiwala asked • 24 minutes agoThe following statements relate to the pressure exerted by a fluid on a submerged curved surface.
1.The vertical component of hydrostatic force acting on a submerged curved surface acts through the center of volume of the fluid directly above the submerged area.
2.The horizontal component of the force acting on a curved surface is the hydrostatic force acting on the vertical projection of the curved surface.
3.The resultant force on a curved surface acts on the bottom of the curved surface.
Of these statements,
... more
The following statements relate to the pressure exerted by a fluid on a submerged curved surface.
1.The vertical component of hydrostatic force acting on a submerged curved surface acts through the center of volume of the fluid directly above the submerged area.
2.The horizontal component of the force acting on a curved surface is the hydrostatic force acting on the vertical projection of the curved surface.
3.The resultant force on a curved surface acts on the bottom of the curved surface.
Of these statements,
1.The vertical component of hydrostatic force acting on a submerged curved surface acts through the center of volume of the fluid directly above the submerged area.
2.The horizontal component of the force acting on a curved surface is the hydrostatic force acting on the vertical projection of the curved surface.
3.The resultant force on a curved surface acts on the bottom of the curved surface.
Of these statements,
Lumped heat transfer analysis of a solid object suddenly exposed to a fluid medium at a different temp is valid when[2001]- a)Biot number < 0.1
- b)Biot number > 0.1
- c)Fourier number < 0.1
- d)Fourier number > 0.1
Correct answer is option 'A'. Can you explain this answer?
Lumped heat transfer analysis of a solid object suddenly exposed to a fluid medium at a different temp is valid when
[2001]
a)
Biot number < 0.1
b)
Biot number > 0.1
c)
Fourier number < 0.1
d)
Fourier number > 0.1
Gate Funda answered • 4 hours agoFor lumed system analysis,
Bi < 0.1
Bi < 0.1
Aadarsh Vikram asked • 1 hour 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
Hardik Barot asked • 1 hour 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
Gnaneswar G asked • 1 hour 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
Shubham Rode asked • 1 hour agoMatch List-I with List-II and select the correct answer using the codes given below the lists:List–I (manufacturing process)(a) Finish turning(b) Forming(c) Thread cutting(d) Down millingList–II (Conditions)1. Back lash eliminator2. Zero rate3. Nose radiusing4. Low speed... more
Match List-I with List-II and select the correct answer using the codes given below the lists:
List–I (manufacturing process)
(a) Finish turning
(b) Forming
(c) Thread cutting
(d) Down milling
List–II (Conditions)
1. Back lash eliminator
2. Zero rate
3. Nose radiusing
4. Low speed
Anunay Prasanna asked • 1 hour 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
Mayur Chawla asked • 1 hour 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
Abhishek Govil asked • 2 hours agoLocomotive boiler is a- a)single tube, horizontal, internally fired and stationary boiler
- b)single tube, vertical, externally fired and stationary boiler
- c)multitubular, horizontal, internally fired and mobile boiler
- d)multitubular, horizontal, externally fired and stationary boiler
Correct answer is option 'C'. Can you explain this answer?
Locomotive boiler is a
a)
single tube, horizontal, internally fired and stationary boiler
b)
single tube, vertical, externally fired and stationary boiler
c)
multitubular, horizontal, internally fired and mobile boiler
d)
multitubular, horizontal, externally fired and stationary boiler
Prasanna Tikar asked • 2 hours agoPitching of a ship produces forces on the bearings- a)in the direction of motion of ship
- b)which act horizontally perpendicular to the motion of ship
- c)in the plane of the pitching
- d)Which act along the axis of the bearings
- e)Which can be resolved into all the three components
Correct answer is option 'D'. Can you explain this answer?
Pitching of a ship produces forces on the bearings
a)
in the direction of motion of ship
b)
which act horizontally perpendicular to the motion of ship
c)
in the plane of the pitching
d)
Which act along the axis of the bearings
e)
Which can be resolved into all the three components
Abhishek Govil asked • 2 hours agoHot tears are casting defects- a)Which occur due to some sand shearing from the cope surface
- b)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escape
- c)Which occur due to discontinuity in metal casting resulting from hindered contraction
- d)caused by two streams of metals that are too cold to fuse properly
Correct answer is option 'C'. Can you explain this answer?
Hot tears are casting defects
a)
Which occur due to some sand shearing from the cope surface
b)
Which take the form of internal voids or surface depression due to excessive gaseous material not able to escape
c)
Which occur due to discontinuity in metal casting resulting from hindered contraction
d)
caused by two streams of metals that are too cold to fuse properly
is applicable for
Laxman Kharayat asked • 3 hours agoWhich of the following are properties of an Ideal fluidI. zero viscosity
II. zero pressure force
III. Incompressible
IV. Steady flow
V. zero surface tension
VI. uniform flow.- a)I,III, IV, V ,VI
- b)I, III, V
- c)I, III
- d)All
Correct answer is option 'C'. Can you explain this answer?
Which of the following are properties of an Ideal fluid
I. zero viscosity
II. zero pressure force
III. Incompressible
IV. Steady flow
V. zero surface tension
VI. uniform flow.
II. zero pressure force
III. Incompressible
IV. Steady flow
V. zero surface tension
VI. uniform flow.
a)
I,III, IV, V ,VI
b)
I, III, V
c)
I, III
d)
All
Sravani asked • 4 hours agoAssertion (A): In anti-friction bearings, the frictional resistance is very low as the shaft held by it remains in floating condition by the hydrodynamic pressure developed by the lubricant. Reason (R): In hydrodynamic journal bearings, hydrodynamic pressure is developed because of flow of lubricant in a converging -diverging channel ... more
Assertion (A): In anti-friction bearings, the frictional resistance is very low as the shaft held by it remains in floating condition by the hydrodynamic pressure developed by the lubricant.
Reason (R): In hydrodynamic journal bearings, hydrodynamic pressure is developed because of flow of lubricant in a converging -diverging channel
Abhishek Govil asked • 4 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 • 5 hours agoIn gating system design, which one of the following is the correct sequence in which chokearea, pouring time, pouring basin and sprue sizes are calculated ?- a)Choke area - Pouring time - Pouring basin-Sprue
- b)Pouring basin - Sprue - Choke area - Pouring time
- c)Choke area - Sprue - Pouring basin - Pouring time
- d)Pouring basin - Pouring time - Choke area-Sprue
Correct answer is option 'A'. Can you explain this answer?
In gating system design, which one of the following is the correct sequence in which chokearea, pouring time, pouring basin and sprue sizes are calculated ?
a)
Choke area - Pouring time - Pouring basin-Sprue
b)
Pouring basin - Sprue - Choke area - Pouring time
c)
Choke area - Sprue - Pouring basin - Pouring time
d)
Pouring basin - Pouring time - Choke area-Sprue
Ankit Singh asked • 6 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
Soumyareddy Sareddy asked • 6 hours agoA 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
Jayananda Dehury asked • 7 hours agoWorm working or semi-hot working process, which is the plastic deformation of metal or alloy under conditions of temperature and strain rate, is performed to eliminate drawbacks of - a) cold working process
- b) hot working process
- c) both cold and hot working processes
- d) none of the above
Correct answer is option 'C'. Can you explain this answer?
Worm working or semi-hot working process, which is the plastic deformation of metal or alloy under conditions of temperature and strain rate, is performed to eliminate drawbacks of
a)
cold working process
b)
hot working process
c)
both cold and hot working processes
d)
none of the above
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
Demon21 Exposed asked • 7 hours agoA Carnot engine operates between temperature 1000 K and 400 K. The heat rejected by the first Carnot engine is used by the second Carnot engine, whose sink temperature is 200 K. If the net heat absorbed by the first Carnot engine is 200 MJ. What is the heat rejected (in MJ) by the second Carnot engine?- a)40
- b)50
- c)60
- d)70
Correct answer is option 'A'. Can you explain this answer?
A Carnot engine operates between temperature 1000 K and 400 K. The heat rejected by the first Carnot engine is used by the second Carnot engine, whose sink temperature is 200 K. If the net heat absorbed by the first Carnot engine is 200 MJ. What is the heat rejected (in MJ) by the second Carnot engine?
a)
40
b)
50
c)
60
d)
70
Achuth Kumar Yelleti asked • 7 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
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