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Category: Mechanical Engineering Mcqs
Which is false statement about advantages of V-type engine_________________?
A. compact design requiring lesser space
B. improved distribution of air to cylinder
C. casting less liable to distortion
D. reduced torsional vibration because of shorter crankshaft
E. less overhead clearance
Slow plastic defomiation of metals under a constant stress is known as________________?
A. creep
B. fatigue
C. endurance
D. plastic deformation
E. non-plastic deformation
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
A. remain same
B. decrease
C. increase
D. unpredictable
E. none of the above
Capillary action is due to the_________________?
A. surface tension
B. cohesion of the liquid
C. adhesion of the liquid molecules and the molecules on the surface of a solid
D. all of the above
E. none of the above
One of the purposes of sub-cooling the liquid refrigerant is to________________?
A. reduce compressor overheating
B. reduce compressor discharge temperature
C. increase cooling effect
D. ensure that only liquid and not the vapour enters the expansion (throttling) valve
E. none of the above
Carbon in iron is an example of__________________?
A. substitutional solution
B. interstitial solid solution
C. intermetallic compounds
D. all of the above
E. none of the above.
Unit of thermal diffusivity is_________________?
A. m2/hr
B. m2/hr°C
C. kcal/m2 hr
D. kcal/m.hr°C
E. kcal/m2 hr°C
Change in enthalpy of a system is the heat supplied at___________________?
A. constant pressure
B. constant temperature
C. constant volume
D. constant entropy
E. N.T.P. condition
Graphical method, simplex method, and transportation method are concerned with__________________?
A. break-even analysis
B. value analysis
C. linear programming
D. queing theory
E. tnaterial handling
Belt slip may occur due to________________?
A. heavy load
B. loose belt
C. driving pulley too small
D. all of the above
E. none of the above
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