mechanical engineering MCQs – Page 39

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 Review each marked answer and report any item that may be outdated or unclear.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

761. A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as______________________?
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A. chain riveted joint

B. criss-cross riveted joint

C. zig-zag riveted joint

D. none of the above

E. diamond riveted joint

762. Idler pulley is used___________________?
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A. none of the above

B. for changing the direction of motion of the belt

C. for applying tension

D. for increasing -velocity ratio

E. all of the above

763. Which of the following refrigerants has lowest freezing point_______________?
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A. Freon-22

B. C02

C. NH3

D. S02

E. Freon-12

764. Flexible coupling is used because _____________________?
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A. it increases shaft life

B. it is easy to engage and disengage

C. it is easy to disassemble

D. it transmits shocks gradually

E. it prevents shock transmission and eliminates stress reversals

765. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either___________________?
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A. meet in a point

B. all the above are correct

C. be all parallel

D. none of the above

E. at least two of them must meet

766. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?
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A. increase refrigeration effect

B. detect liquid in vapour

C. collect liquid refrigerant and prevent it from going to compressor

D. superheat the vapour

E. collect vapours

767. Which of the following is a lower pair_______________?
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A. A. and B. above

B. piston and cylinder

C. ball and socket i

D. belt drive

E. cam and follower

768. For which material the Poissons ratio is more than unity_________________?
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A. steel

B. aluminium

C. none of the above

D. cast iron

E. copper

769. The bank of tubes at the back of domestic refrigerator are _________________?
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A. evaporator tubes

B. throttling device

C. condenser tubes

D. capillary tubes

E. refrigerant cooling tubes

770. Rivets are made of following type of material_________________?
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A. malleable

B. resilient

C. ductile

D. tough

E. hard

771. Pitch point on a cam is_________________?
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A. any point on pitch circle

B. the point on cam pitch curve having the minimum pressure angle

C. any point on pitch curve

D. none of the above

E. the point on cam pitch curve having the maximum pressure angle

772. Which is the false statement about true stress-strain method______________?
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A. It does not exist

B. It is more sensitive to changes in both metallurgical and mechanical conditions

C. It gives, a more accurate picture of the ductility

D. It can be correlated with stress-strain values in other tests like torsion, impact, combined stress tests etc.

E. It can be used for compression tests as well.

773. A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be_________________?
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A. 300 MN/m2

B. 30 MN/m2

C. 50 MN/m2

D. 200 MN/m2

E. 100 MN/m2

774. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to_________________?
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A. 500

B. 250

C. 100

D. 50

E. 25

775. Elements of pairs held together mechanically is known as ___________________?
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A. closed pair

B. rolling pair

C. none of the above

D. open pair

E. mechanical pair

776. The Ackermann steering mechanism is preferred to the Davis type in automobiles because____________________?
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A. the former is having turning pair

B. the former is mathematically accurate

C. the former is most economical

D. none of thfr above

E. the former is most rigid

777. In riveted boiler joints, all stresses, shearing, bearing and tensile are based on the_________________?
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A. smaller of the two

B. size of the drilled or reamed hole

C. size of rivet

D. average of size of rivet and hole

E. any one of the above

778. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?
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A. less

B. more

C. may have any value

D. more/less depending on composition

E. same

779. Reducing suction pressure in refrigeration cycle_________________?
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A. lowers compressor capacity because vapour is lighter

B. reduces weight displaced by piston

C. lowers evaporation temperature

D. all of the above

E. increases power required per ton of refrigeration

780. The number of links in pantograph mechanism is equal to______________?
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A. 5

B. 2

C. 3

D. 6

E. 4

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