mechanical engineering MCQs – Page 34

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

661. The stress induced in a body due to suddenly applied load compared to when it is applied gradually is________________?
0

A. two times

B. four times

C. none of the above

D. half

E. same

662. The Youngs modulus of a wire is defined as the stress which will increase the length of wire compared to its original length________________?
0

A. four times

B. one-fourth

C. same amount

D. double

E. half

663. The unit of Youngs modulus is__________________?
0

A. kg

B. kg cm2

C. kg/cm2

D. kg/cm

E. mm/mm

664. If the radius of wire stretched by a load is doubled, then its Youngs modulus will be_______________?
0

A. remain unaffected

B. halved

C. become four times

D. become one-fourth

E. doubled

665. The COP of a vapor compression plant in comparison to vapor absorption plant is ________________?
0

A. more

B. less

C. same

D. unpredictable

E. more/less depending on size of plant

666. The example of spherical pair is_____________________?
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A. ball bearing and roller bearing

B. lead screw of a lathe

C. bolt and nut

D. ball and socket joint

E. none of the above

667. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then_________________?
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A. refrigerant with lower evaporation temperature should be used

B. smaller cabinet should be used

C. perfectly tight vapour seal should be used

D. refrigerant with high boiling point must be used

E. bigger cabinet should be used

668. The change in the unit volume of a material under tension with increase in its Poissons ratio will ________________?
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A. increase initially and then decrease

B. decrease

C. increase

D. unpredictable

E. remain same

669. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?
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A. more than 10 kg

B. less than 2 kg

C. pone of the above

D. more than or equal to 3.65 kg

E. there is no such consideration

670. Proof resilience per material is known as________________?
0

A. impact energy

B. resilience

C. toughness

D. proof resilience

E. modulus of resilience

671. The tendency of a body to resist change from rest or motion is known as_______________?
0

A. resisting torque

B. friction

C. mass

D. resisting force

E. inertia

672. The advantage of the piston valve over D-slide valve is that in the former case____________________?
0

A. wear is less

B. power absorbed is less

C. both wear and power absorbed are low

D. the pressure developed being high provides tight sealing

E. there is overall economy of initial cost, maintenance and operation

673. Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?
0

A. direct

B. absorption

C. indirect

D. compression

E. none of the above

674. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly_______________?
0

A. 96 m

B. 62.5 m

C. 38 m

D. 124 m

E. 240 m

675. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by_______________?
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A. electromagnetic coupling

B. flexible coupling

C. knuckle joint

D. Oldhams coupling

E. universal joint

676. Air refrigeration cycle is used in ____________________?
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A. domestic refrigerators

B. such a cycle does not exist

C. air conditioning

D. commercial refrigerators

E. gas liquefaction

677. One ton of the refrigeration is_________________?
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A. the refrigeration effect to produce 1 ton of ice at NTP conditions

B. the refrigeration effect to freeze 1 ton of water at 0C into ice at 0C in 24 hours

C. the cooling effect produced by melting 1 ton of ice

D. the refrigeration effect to produce 1 ton of ice in 1 hour time

E. the standard unit used in refrigeration problems

678. When it is indicated that a member is elastic, it means that when force is applied, it will________________?
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A. not stretch

B. stretch

C. none of the above

D. be safest

E. not deform

679. Under-cooling in a refrigeration cycle_________________?
0

A. decreases COF

B. COP remains unaltered

C. unperdictable

D. increases COP

E. other factors decide COP

680. The maximum strain energy that can be stored in a body is known as________________?
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A. proof resilience

B. toughness

C. impact energy

D. modulus of resilience

E. resilience

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