mechanical engineering MCQs – Page 38

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 Review each marked answer and report any item that may be outdated or unclear.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

741. One of the purposes of sub-cooling the liquid refrigerant is to________________?
0

A. ensure that only liquid and not the vapour enters the expansion (throttling) valve

B. none of the above

C. reduce compressor overheating

D. increase cooling effect

E. reduce compressor discharge temperature

742. The stress developed in a material at breaking point in extension is called_________________?
0

A. ultimate tensile stress

B. breaking stress

C. yield point stress

D. fracture stress

E. proof stress

743. The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is______________________?
0

A. chain coupling

B. flexible coupling

C. Oldhams coupling

D. universal coupling

E. American coupling

744. True stress-strain curve for materials is plotted between__________________?
0

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

B. load/instantaneous area and instantaneous area/original area

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

D. none of the above

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

745. Oldhams coupling is the ____________________?
0

A. fourth inversion of double slider crank chain

B. third inversion of slider crank chain

C. second inversion of double slider crank chain

D. third inversion of double slider crank chain

E. second inversion of single slider crank chain

746. The indicator using Watt mechanism is known as________________?
0

A. Simplex indicator

B. none of the above

C. Thompson indicator

D. Richard indicator

E. Thomson indicator

747. A non-yielding support implies that the_________________?
0

A. none of the above

B. support is frictionless

C. slope of the beam at the support is zero

D. support can take any amount of reaction

E. support holds member firmly

748. The safe twisting moment for a compound shaft is equal to the _________________?
0

A. extreme value

B. maximum calculated value

C. none of the above

D. minimum calculated value

E. mean value

749. A cable with a uniformly distributed load per horizontal metre run will take the following shape_________________?
0

A. hyperbola

B. elliptical

C. parabola

D. straight line

E. part of a circle

750. The algebraic sum of moments of the forces forming couple about any point in their plane is__________________?
0

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

751. The property of a material by virtue of which a body returns to its original, shape after removal of the load is called____________________?
0

A. ductility

B. malleability

C. resilience

D. plasticity

E. elasticity

752. Where does the lowest temperature occur in a vapour compression cycle ?
0

A. compressor

B. receiver

C. expansion valve

D. condenser

E. evaporator

753. The maximum frictional force which comes into play when a body just begins to slide over another surface is called________________?
0

A. dynamic friction

B. kinematic friction

C. limiting friction

D. sliding friction

E. rolling friction

754. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P_____________________?
0

A. none of the above

B. equally.

C. less

D. unpredictable

E. more

755. In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?
0

A. wet vapour

B. saturated liquid

C. liquid

D. sub-cooled liquid

E. dry vapour

756. The ratio of lateral strain to the linear strain within elastic limit is known as_______________?
0

A. Poissons ratio

B. bulk modulus

C. modulus of rigidity

D. modulus of elasticity

E. Youngs modulus

757. Creep in belt drive is due to____________________?
0

A. material of the pulley

B. expansion of belt

C. larger size of the driver pulley

D. material of the belt

E. uneven extensions and contractions due to varying tension

758. The advantage of dry compression is that________________?
0

A. all of the above

B. it permits complete evaporation in the evaporator

C. it results in high volumetirc and mechanical efficiency

D. none of the above

E. it permits higher speeds to be used

759. The refrigerant for a refrigerator should have ___________________?
0

A. high sensible heat

B. low sensible heat

C. low latent heat

D. high total heat

E. high latent heat

760. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella ________________________?
0

A. more inclined when standing

B. less inclined when moving

C. none of the above

D. more inclined when moving

E. less inclined when standing

Previous Next

Showing 741 to 760 of 4266 mcqs