mechanical engineering MCQs – Page 31

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 Review each marked answer and report any item that may be outdated or unclear.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

601. A single force and a couple acting in the same plane upon a rigid body_________________?
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A. balance each other

B. produce moment of a couple

C. are equivalent

D. cannot balance each other

E. none of the above

602. In an ideal machine, the output as compared to input is_______________?
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A. less

B. may be less or more depending on efficiency

C. more

D. equal

E. always less

603. Which of the following materials is most elastic_________________?
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A. brass

B. plastic

C. steel

D. glass

E. rubber

604. Rating of a domestic refrigerator is of the order of__________________?
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A. 100 tons

B. 40 tons

C. 10 tons

D. 5 tons

E. 0.1 ton

605. Condensing temperature in a refrigerator is the temperature_________________?
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A. of evaporator

B. at which refrigerant gas becomes liquid

C. of cooling medium

D. of freezing zone

E. condensing temperature of ice

606. The lower pair is a_____________________?
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A. open pair

B. does not exist

C. sliding pair

D. closed pair

E. point contact pair

607. Ammonia is __________________?
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A. non-inflammable

B. none of the above

C. toxic and non-inflammable

D. highly toxic and inflammable

E. non-toxic

608. In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?
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A. high, of the order of 25

B. none of the above

C. zero

D. as low as possible (3 to 11C)

E. any value

609. Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts__________________?
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A. kinematics

B. kinetics

C. applied mechanics

D. theory of machines

E. mechanisms

610. the chain is constrained when_________________?
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A. L.H.S. = R.H.S.

B. none of the above

C. there is no such criterion for checking above requirement

D. L.H.S. R.H.S.

611. The percentage reduction in area of a cast iron specimen during tensile test would be of the order of_________________?
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A. negligible

B. more than 50%

C. 1025%

D. 2550%

E. 510%

612. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of __________________?
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A. repose

B. static friction

C. friction

D. limiting friction

E. kinematic friction

613. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?
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A. 4 tonnes/cm2

B. 16 tonnes/cm2

C. none of the above

D. 8 tonnes/cm2

E. 22 tonnes/cm2

614. Rupture stress is________________?
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A. maximum load/original cross-sectional area

B. breaking stress

C. load at breaking point/A

D. load at breaking point/neck area

E. maximum stress

615. Rectangular bar in a rectangular hole is the following type of pair__________________?
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A. none of the above

B. incompletely constrained motion

C. partially constrained motion

D. completely constrained motion

E. freely constrained motion

616. If the rivets in adjacent rows are staggered and the outermost row has only one rivet, the arrangement of the rivets is called__________________?
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A. criss-cross riveting

B. diamond riveting

C. none of the above

D. chain riveting

E. zig zag riveting

617. The Scott-Russell mechanism consists of_________________?
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A. sliding pairs only

B. sliding and turning pairs

C. sliding and rotary pairs

D. turning pairs only

E. turning and rotary pairs

618. the chain is unconstrained when_____________?
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A. none of the above

B. L.H.S. = R.H.S

C. L.H.S. > R.H.S

D. L.H.S. < R.H.S

E. there is no such criterion for checking above requirement

619. The materials which exhibit the same elastic properties in all directions are called______________?
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A. visco-elastic.

B. isotropic

C. inelastic

D. homogeneous

E. isentropic

620. Which of the following is not a desirable property of a refrigerant_________________?
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A. large latent heat

B. low boiling point

C. high triiscibility with oil

D. good electrical conductor

E. non-inflammable

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