mechanical engineering MCQs – Page 41

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 Review each marked answer and report any item that may be outdated or unclear.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

801. The e.g. of a link in any mechanism would experience_________________?
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A. no acceleration

B. linear acceleration

C. angular acceleration

D. both angular and linear accelerations

E. none of the above

802. The stress at which extension of the material takes place more quickly as compared to the increase in load is called______________?
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A. plastic point of the material

B. elastic point of the material

C. breaking point of the material

D. ultimate point of the material

E. yielding point of the material

803. Crowning on pulleys helps__________________?
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A. in decreasing the slip of the belt

B. for automatic adjustment of belt posi-tion so that belt runs centrally

C. increase belt and pulley life

D. in increasing velocity ratio

E. none of the above

804. Shear stress induced in a shaft subjected to tension will be__________________?
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A. maximum at periphery and zero at center

B. maximum at center

C. none of the above

D. uniform throughout

E. average value in center

805. Pulley in a belt drive acts as_______________?
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A. sliding pair

B. turning pair

C. surface pair

D. cylindrical pair

E. rolling pair

806. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under_________________?
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A. increase uniformly

B. uniform throughout

C. increase rapidly first and then uniformly

D. increase uniformly first and then increase rapidly

E. first increase and then decrease

807. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight________________?
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A. of same magnitude as that of bar and applied at the lower end

B. none of the above

C. half of the square of weight of bar applied at lower end

D. half the weight of bar applied at lower end

E. one-fourth of weight of bar applied at lower end

808. The distance between the centres of the rivets in adjacent rows of zig-zag riveted joint is known as ____________________?
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A. lap

B. diagonal pitch

C. pitch

D. diametral pitch

E. back pitch

809. A beam is loaded as cantilever. If the load at the end is increased, the failure will occur ___________________?
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A. none of the above

B. at the tip below the load

C. at the support

D. anywhere

E. in the middle

810. The evolution of heat of solution takes place in ammonia absorption plant when _____________________?
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A. ammonia vapour is driven out of solution

B. lithium bromide is driven out of solution

C. weak solution mixes with strong solution

D. lithium bromide mixes with ammonia

E. ammonia vapour goes into solution

811. 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

812. The leaks in a refrigeration system using Freon are detected by____________________?
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A. smelling

B. sulphur sticks which on detection gives white smoke

C. using reagents

D. halide torch which on detection produces greenish flame lighting

E. sensing reduction in pressure

813. With single Hookes joint it is possible to connect two shafts, the axes of which have an angular misalignment up to ________________?
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A. 60.

B. 30

C. 20

D. 10

E. 40

814. 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. compression

B. bearing

C. any one of the above

D. tension

E. none of the above

815. Coulomb friction is the friction between_____________________?
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A. two lubricated surfaces

B. bodies having relative motion

C. electrically charged particles

D. two dry surfaces

E. solids and liquids

816. One watt is equal to__________________?
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A. 1 Nm/s

B. 1 kNm/mt

C. 1 N/mt

D. 1 kNm/hr

E. 1 Nm/hr

817. General gas equation is____________________?
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A. Cp-Cv = Wj

B. PV = C

C. PV=KiRT

D. PV=mRT

E. PV=nRT

818. According to kinetic theory of gases, the absolute zero temperature is attained when___________________?
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A. kinetic energy of the molecules is zero

B. mass is zero

C. specific heat of gas is zero

D. pressure of the gas is zero

E. volume of the gas is zero

819. Gases have___________________?
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A. two values of specific heat

B. under some conditions one value and sometimes two values of specific heat

C. three values of specific heat

D. no value of specific heat

E. only one value of specific heat

820. The endurance limit of a material with finished surface in comparison to rough surface is_________________?
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A. less

B. same

C. more or less depending on quantum of load

D. unpredictable

E. more

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