mechanical engineering MCQs – Page 142

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 Review each marked answer and report any item that may be outdated or unclear.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

2821. In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be____________________?
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A. increase key length

B. none of the above

C. increase key width

D. increase key depth

E. double all the dimensions

2822. The C.G. of a plane lamina will not be at its geometrical centre in the case of a __________________?
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A. equilateral triangle

B. circle

C. rectangle

D. square

E. right angled triangle

2823. Flow stress corresponds to___________________?
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A. rupture stress

B. breaking point

C. plastic deformation of solids

D. none of the above

E. fluids in motion

2824. 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. 250

B. 500

C. 25

D. 50

E. 100

2825. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called_____________?
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A. breaking

B. plasticity

C. yielding

D. creeping

E. none of the above

2826. Coulomb friction is the friction between_____________________?
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A. two dry surfaces

B. solids and liquids

C. bodies having relative motion

D. two lubricated surfaces

E. electrically charged particles

2827. The impact strength of a material is an index of its ___________________?
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A. toughness

B. hardness

C. fatigue strength

D. tensile strength

E. capability of being cold worked

2828. The internal reaction in bottom 80 cm length will be________________?
0

A. same in both cases

B. zero in first case

C. different in both cases

D. data are not sufficient to determine same

E. none of the above

2829. 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. friction

B. limiting friction

C. kinematic friction

D. static friction

E. repose

2830. The energy absorbed in a body, when it is strained within the elastic limits, is known as________________?
0

A. proof resilience

B. strain energy

C. modulus of resilience

D. resilience

E. toughness

2831. For which material the Poissons ratio is more than unity_________________?
0

A. copper

B. cast iron

C. aluminium

D. steel

E. none of the above

2832. The value of Poissons ratio for cast iron is_________________?
0

A. 0.1 to 0.2

B. 0.25 to 0.33

C. 0.23 to 0.27

D. 0.4 to 0.6

E. 3 to 4

2833. 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. none of the above

C. criss-cross riveted joint

D. diamond riveted joint

E. zig-zag riveted joint

2834. The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called___________________?
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A. yeiled stress

B. none of the above

C. longitudinal stress

D. hoop stress

E. ultimate stress

2835. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly_______________?
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A. 62.5 m

B. 38 m

C. 124 m

D. 96 m

E. 240 m

2836. A material capable of absorbing large amount of energy before fracture is known as________________?
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A. plasticity

B. ductility

C. resilience

D. shock proof

E. toughness

2837. The percentage reduction in area of a cast iron specimen during tensile test would be of the order of_________________?
0

A. 1025%

B. 510%

C. 2550%

D. negligible

E. more than 50%

2838. A cable with a uniformly distributed load per horizontal metre run will take the following shape_________________?
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A. straight line

B. elliptical

C. hyperbola

D. part of a circle

E. parabola

2839. A key is subjected to side pressure as well at shearing forces. These pressures are called_________________?
0

A. none of the above

B. resultant stresses

C. crushing stresses

D. fatigue stresses

E. bearing stresses

2840. Which of the following is the example of lever of first order__________________?
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A. arm of man

B. all of the above

C. none of the above

D. pair of clinical tongs

E. pair of scissors

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