Mechanical Engineering MCQs

Page No. 19

On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?


ahorizontal straight line


bvertical straight line


cstraight inclined line


dcurved line



A wet vapour can be completely specified by__________________?


apressure only


btemperature only


cdryness fraction only


dpressure and dryness fraction



The specific heat of superheated steam in kcal/kg is generally of the order of___________________?


a0.1


b0.3


c0.5


d0.8


View Answer 0.5

One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is__________________?


a0.2


b0.8


c1.0


d0.6


View Answer 0.8

Sublimation region is the region where__________________?


asolid and vapour phases are in equi-librium


bsolid and liquid phases are in equilibrium


cliquid and vapour phases are in equilibrium


dsolid, liquid and vapour phases are in equilibrium



The equivalent evaporation of a boiler is a measure to compare _________________?


athe given boiler with the model


bthe two different boilers of the same make


ctwo different makes of boilers operat¬ing under the same operating conditions


dany type of boilers operating under any conditions



Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?


a0°C


b100°C


csaturation temperature at given pressure


droom temperature


View Answer 100°C

1 kg.m is equal to_________________?


a9.81 Joules


bAll Joules


c427 Joules


d102 Joules


View Answer 9.81 Joules

Coke is produced by__________________?


apulverising coal in inert atmosphere


bheating wood in a limited supply of air at temperatures below 300GC


cstrongly heating coal continuously for about 48 hours in the absence of air in a closed vessel


dbinding the pulverised coal into brick-etts



The critical pressure at which latent heat of vaporisation is zero is________________?


a225.65 kgf/cm2


b273 kgf/cm2


c100 kgf/cm2


d1 kgf/cm2


View Answer 225.65 kgf/cm2

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