mechanical engineering MCQs – Page 40

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 Review each marked answer and report any item that may be outdated or unclear.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

781. The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. per ton of refrigeration__________________?
0

A. 5 to 10 h.p. per ton refrigeration

B. 0.1 to 0.5 h.p. per ton of refrigeration

C. 1 to 2 h.p. per ton of refrigeration

D. 0.5 to 0.8 h.p. per ton of refrigeration

E. 2 to 5 h.p. per ton of refrigeration

782. In higher pair, the relative motion is_____________________?
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A. purely surface contact

B. purely sliding

C. combination of sliding and turning

D. purely turning

E. purely rotary

783. In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?
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A. more

B. less for small capacity and more for high capacity

C. less

D. same

E. more for small capacity and less for high capacity

784. Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?
0

A. 1:01

B. 3:01

C. 1 : 9

D. 9:01

E. 1:03

785. The higher temperature in vapour compression cycle occurs at____________________?
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A. receiver

B. compressor discharge

C. expansion valve

D. evaporator

E. condenser discharge

786. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts_______________?
0

A. kinetics

B. mechanisms

C. kinematics

D. theory of machines

E. applied mechanics

787. The moment on the pulley which produces rotation is called ___________________?
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A. momentum

B. work

C. inertia

D. moment of momentum

E. torque

788. Davis steering gear consists of__________________?
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A. turning pairs

B. rolling pairs

C. higher pairs

D. lower pairs

E. sliding pairs

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

B. at distance from the plane base 3r

C. at distance from the plane base or

D. at distance from the plane base 3r

E. at distance from the plane base 3r

790. Any point on a link connecting double slider crank chain will trace a ________________?
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A. hyperbola

B. ellipse

C. straight line

D. parabola

E. circle

791. Longitudinal stress in a thin cylinder is__________________?
0

A. equal to the hoop stress

B. one-fourth of hoop stress

C. four times the hoop stress

D. half of the hoop stress

E. twice the hoop stress

792. The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will__________________?
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A. remain unaffected

B. decrease

C. may increase or decrease depending on the type of refrigerant used

D. increase

E. unpredictable

793. Modulus of rigidity is defined as the ratio of_________________?
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A. shear stress and shear strain

B. volumetric stress and volumetric strain

C. lateral stress and lateral strain

D. linear stress and lateral strain

E. longitudinal stress and longitudinal strain

794. 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 _________________?
0

A. 01:02.5

B. 1:04

C. 1 : 3

D. 01:02.2

E. 1:02

795. The coefficient of performance is the ratio of the refrigerant effect to the_________________?
0

A. all of the above

B. none of the above

C. work done by compressor

D. enthalpy increase in compressor

E. heat of compression

796. Highest temperature encountered in refrigeration cycle should be________________?
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A. above critical temperature

B. at critica. temperature

C. near critical temperature of refrigerant

D. much below critical temperature

E. could be anywhere

797. The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to___________________?
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A. Poissons ratio

B. bulk modulus

C. Youngs modulus

D. modulus of rigidity

E. modulus of elasticity

798. 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. creeping

B. breaking

C. none of the above

D. yielding

E. plasticity

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

B. elasticity

C. malleability

D. ductility

E. plasticity

800. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as__________________?
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A. turning pair

B. spherical pair

C. rolling pair

D. sliding pair

E. lower pair

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