mechanical engineering MCQs – Page 140

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 Review each marked answer and report any item that may be outdated or unclear.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

2781. In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are ?
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A. average of the sum of moduli of elas-ticity

B. proportional to their respective moduli of elasticity

C. none of the above

D. equal

E. inversely proportional to their moduli of elasticity

2782. The necessary condition for forces to be in equilibrium is that these should be_____________________?
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A. coplanar

B. meet at one point ;

C. both A. and B. above

D. all be equal

E. something else

2783. Resilience of a material is considered when it is subjected to_________________?
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A. shock loading

B. frequent heat treatment

C. resonant condition

D. creep

E. fatigue

2784. Dynamic friction as compared to static friction is __________________?
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A. has no correlation

B. less

C. may be less of more depending on nature of surfaces and velocity

D. same

E. more

2785. The materials having same elastic properties in all directions are called________________?
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A. ideal materials

B. isotropic materials

C. elastic materials

D. uniform materials

E. paractical materials

2786. The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be _________________?
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A. 1:04

B. 01:02.2

C. 01:02.5

D. 1 : 3

E. 1:02

2787. Which of the following materials is most elastic_________________?
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A. rubber

B. glass

C. steel

D. brass

E. plastic

2788. The change in the unit volume of a material under tension with increase in its Poissons ratio will ________________?
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A. remain same

B. unpredictable

C. increase

D. decrease

E. increase initially and then decrease

2789. The intensity of stress which causes unit strain is called_______________?
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A. modulus of elasticity

B. principal stress

C. unit stress

D. modulus of rigidity

E. bulk modulus

2790. The elasticity of various materials is controlled by its___________________?
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A. stress at yield point

B. stress at elastic limit

C. proof stress

D. tensile stress

E. ultimate tensile stress

2791. When two plates are butt together and riveted with cover plates with two rows of rivets, the joi;it is known as ___________________?
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A. lap point

B. double riveted double cover butt joint

C. single riveted double cover butt joint

D. butt joint

E. single riveted single cover butt joint

2792. Rupture stress is________________?
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A. maximum stress

B. maximum load/original cross-sectional area

C. load at breaking point/neck area

D. load at breaking point/A

E. breaking stress

2793. A non-yielding support implies that the_________________?
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A. support is frictionless

B. support holds member firmly

C. slope of the beam at the support is zero

D. none of the above

E. support can take any amount of reaction

2794. The property of a material by virtue of which it can be beaten or rolled into plates is called _________________?
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A. ductility

B. malleability

C. elasticity

D. plasticity

E. reliability

2795. Shear stress induced in a shaft subjected to tension will be__________________?
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A. uniform throughout

B. maximum at periphery and zero at center

C. none of the above

D. average value in center

E. maximum at center

2796. Proof resilience per material is known as________________?
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A. toughness

B. modulus of resilience

C. impact energy

D. proof resilience

E. resilience

2797. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal__________________?
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A. metal is twice as dense as unknown fluid

B. density of metal cant be determined

C. metal is twice as dense as water

D. metal will float in water

E. none of the above

2798. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to__________________?
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A. Wsin(a + )

B. Wcos(a + )

C. Wtan(a-)

D. Wtan(a + )

E. W (sin a + cos ).

2799. Percentage reduction of area in performing tensile test on cast iron may be of the order of__________________?
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A. 50%

B. 0%

C. 15%

D. 25%

E. 60%.

2800. Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the unpunched plate in_________________?
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A. none of the above

B. any one of the above

C. compression

D. tension

E. bearing

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