mechanical engineering MCQs – Page 141

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 Review each marked answer and report any item that may be outdated or unclear.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

2801. The C.G. of a solid hemisphere lies on the central radius 3r_________________?
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A. at distance from the plane base 3r

B. at distance from the plane base 3r

C. at distance from the plane base

D. at distance from the plane base or

E. at distance from the plane base 3r

2802. The safe twisting moment for a compound shaft is equal to the _________________?
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A. minimum calculated value

B. mean value

C. maximum calculated value

D. none of the above

E. extreme value

2803. True stress-strain curve for materials is plotted between__________________?
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A. load/instantaneous area and instantaneous area/original area

B. load/original cross-sectional area and change in length/original length

C. none of the above

D. load/instantaneous cross-sectional area original area and log

E. load/instantaneous cross-sectional area and change in length/original length

2804. If a part is constrained to move and heated, it will develop ____________________?
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A. principal stress

B. compressive stress

C. tensile stress

D. no stress

E. shear stress

2805. The property of a material which allows it to be drawn into a smaller section is called________________?
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A. drawabihty

B. malleability

C. plasticity

D. ductility

E. elasticity

2806. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one_______________?
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A. ellipse

B. hyperbola

C. parabola

D. none of the above

E. circle

2807. The stress necessary to initiate yielding is_________________?
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A. greater than that necessary to stop it

B. considerably lesser than that necessary to continue it

C. equal to that necessary to stop it

D. lesser than that necessary to stop it

E. considerably greater than that necessary to continue it

2808. The co-efficient of friction depends upon _________________?
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A. nature of surfaces

B. ail of the above.

C. A. and B. above

D. area of contact

E. shape of the surfaces

2809. The materials which exhibit the same elastic properties in all directions are called______________?
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A. isentropic

B. homogeneous

C. isotropic

D. inelastic

E. visco-elastic.

2810. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella ________________________?
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A. less inclined when standing

B. more inclined when moving

C. more inclined when standing

D. less inclined when moving

E. none of the above

2811. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of___________________?
0

A. r/2

B. r/A

C. r/%

D. 0.134 r

E. 3r/8

2812. A single force and a couple acting in the same plane upon a rigid body_________________?
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A. are equivalent

B. cannot balance each other

C. none of the above

D. balance each other

E. produce moment of a couple

2813. A cylindrical section having no joint is known as ____________________?
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A. jointless section

B. seamless section

C. homogeneous section

D. manufactured section

E. perfect section

2814. The value of Poissons ratio for steel is between_________________?
0

A. 3 to 4

B. 0.25 to 0.33

C. 0.01 to 0.1

D. 0.4 to 0.6

E. 0.23 to 0.27

2815. The algebraic sum of moments of the forces forming couple about any point in their plane is__________________?
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A. equal to the moment of the couple

B. constant

C. both of above are correct

D. both of above are wrong

E. none of the above

2816. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?
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A. same

B. less

C. more/less depending on composition

D. may have any value

E. more

2817. The ratio of lateral strain to the linear strain within elastic limit is known as_______________?
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A. bulk modulus

B. modulus of elasticity

C. modulus of rigidity

D. Youngs modulus

E. Poissons ratio

2818. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?
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A. none of the above

B. 22 tonnes/cm2

C. 4 tonnes/cm2

D. 8 tonnes/cm2

E. 16 tonnes/cm2

2819. If n = number of members andy = number of joints, then for a perfect frame, n =________________?
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A. 2/ -4

B. 2/-3

C. j-2

D. 3/-2

E. 2j-l

2820. A beam is loaded as cantilever. If the load at the end is increased, the failure will occur ___________________?
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A. anywhere

B. in the middle

C. at the tip below the load

D. none of the above

E. at the support

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