mechanical engineering MCQs – Page 143

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 Review each marked answer and report any item that may be outdated or unclear.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

2841. When it is indicated that a member is elastic, it means that when force is applied, it will________________?
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A. none of the above

B. be safest

C. stretch

D. not stretch

E. not deform

2842. The value of shear stress which is induced in the shaft due to the applied couple varies____________________?
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A. from maximum at the center to zero at the circumference

B. from zero at the center to maximum at the circumference

C. from maximum at the center to mini-mum at the cricumference

D. from minimum at the centro to maxi-mum at the circumference

E. none of the above

2843. The total strain energy stored in a body is termed as__________________?
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A. resilience

B. modulus of resilience

C. proof resilience

D. toughness

E. impact energy

2844. The stress developed in a material at breaking point in extension is called_________________?
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A. ultimate tensile stress

B. breaking stress

C. proof stress

D. fracture stress

E. yield point stress

2845. The Youngs modulus of a wire is defined as the stress which will increase the length of wire compared to its original length________________?
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A. same amount

B. half

C. one-fourth

D. double

E. four times

2846. For steel, the ultimate strength in shear as compared to in tension is nearly _________________?
0

A. one-third

B. same

C. one-fourth

D. half

E. two-third

2847. Hookes law holds good up to____________________?
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A. elastic limit

B. breaking point

C. yield point

D. limit of proportionality

E. plastic limit

2848. Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________?
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A. area at the time of fracture

B. average of A. and B.

C. original cross-sectional area

D. minimum area after fracture

E. none of the above.

2849. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called______________________?
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A. internal resistanpe

B. tensile stress

C. compressive stress

D. transverse stress

E. working stress

2850. If the radius of wire stretched by a load is doubled, then its Youngs modulus will be_______________?
0

A. become four times

B. become one-fourth

C. remain unaffected

D. doubled

E. halved

2851. In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
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A. P between W and F

B. W between P and F

C. F between W and P

D. W, P and F all on one side

E. none of the above

2852. The ultimate tensile stress of mild steel compared to ultimate compressive stress is__________________?
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A. less

B. same

C. unpredictable

D. more or less depending on other factors

E. more

2853. Modulus of rigidity is defined as the ratio of_________________?
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A. volumetric stress and volumetric strain

B. longitudinal stress and longitudinal strain

C. shear stress and shear strain

D. lateral stress and lateral strain

E. linear stress and lateral strain

2854. The stress developed in a material at breaking point in extension is called__________?
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A. Breaking stress

B. Proof stress

C. Fracture stress

D. Yield point stress

2855. 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. first increase and then decrease

B. uniform throughout

C. increase uniformly first and then increase rapidly

D. increase rapidly first and then uniformly

E. increase uniformly

2856. The unit of Youngs modulus is__________________?
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A. kg/cm

B. kg

C. kg cm2

D. kg/cm2

E. mm/mm

2857. Solids and liquids have___________________?
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A. one value under some conditions and two values under other conditions

B. one value of specific heat (ft) two values of specific heat

C. three values of specific heat

D. no value of specific heat

2858. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?
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A. temperature

B. volume

C. internal energy

D. entropy

E. pressure

2859. Brayton cycle consists of following four processes____________________?
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A. two isentropics and two constant volumes

B. two isentropics and two constant pres-sures

C. two isentropics, one constant volume and one constant pressure

D. none of the above

E. two isothermals and two isentropics

2860. Which of the following cycles is not a reversible cycle_____________________?
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A. Stirling

B. none of the above

C. Joule

D. Carnot

E. Ericsson

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