Mechanical Engineering MCQs

Page No. 12

In a throttling process________________?


asteam temperature remaisn constant


bsteam pressure remains constant


csteam enthalpy remains constant


dsteam entropy remains constant



The pressure at which latent heat of vaporisation of water is zero, is_________________?


abelow atmospheric pressure


b1 kg/cm2


c100 kg/cm2


d225.6 kg/cm2


View Answer 225.6 kg/cm2

The latent heat of steam with increase of pressure__________________?


aremains same


bincreases


cdecreases


dbehaves unpredictably


View Answer decreases

At which pressure the properties of water and steam become identical_________________?


a0.1 kg/cm2


b1 kg/cm2


c100 kg/cm2


d225.6 kg/cm2


View Answer 225.6 kg/cm2

While steam expands in turbines, theoretically the entropy________________?


aremains constant


bincreases


cdecreases


dbehaves unpredictably


View Answer remains constant

Adiabatic process is________________?


aessentially an isentropic process


bnon-heat transfer process


creversible process


dconstant temperature process



Pick up the wrong statement about critical condition of steam___________________?


alatent heat is zero


bliquid directly becomes steam


cspecific volume of steam and liquid is same


dthis is the maximum pressure limit



Mechanical equivalent of heat for 1 kcal or Joule’s equivalent is equal to_________________?


a421 kgm


b421 kgm


c539 kgm


d102 kgm


View Answer 421 kgm

The evaporation of 15.653 kg of water per hour from and at 100°C is called_________________?


aevaporative capacity


bfactor of evaporation


cequivalent evaporation


done boiler h.p.


View Answer one boiler h.p.

During polytropic process_________________?


aheat transfer takes place across cylinder walls


bwork is done


csteam may be wet, dry or superheated after expansion


dall of the above


View Answer all of the above

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