Mechanical Engineering MCQs

Page No. 12

In a throttling process________________?


asteam temperature remaisn constant

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bsteam pressure remains constant

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csteam enthalpy remains constant

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dsteam entropy remains constant

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


abelow atmospheric pressure

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b1 kg/cm2

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c100 kg/cm2

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d225.6 kg/cm2

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View Answer 225.6 kg/cm2

The latent heat of steam with increase of pressure__________________?


aremains same

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bincreases

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cdecreases

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dbehaves unpredictably

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View Answer decreases

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


a0.1 kg/cm2

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b1 kg/cm2

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c100 kg/cm2

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d225.6 kg/cm2

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View Answer 225.6 kg/cm2

While steam expands in turbines, theoretically the entropy________________?


aremains constant

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bincreases

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cdecreases

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dbehaves unpredictably

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View Answer remains constant

Adiabatic process is________________?


aessentially an isentropic process

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bnon-heat transfer process

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creversible process

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dconstant temperature process

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Pick up the wrong statement about critical condition of steam___________________?


alatent heat is zero

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bliquid directly becomes steam

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cspecific volume of steam and liquid is same

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dthis is the maximum pressure limit

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


a421 kgm

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b421 kgm

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c539 kgm

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d102 kgm

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View Answer 421 kgm

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


aevaporative capacity

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bfactor of evaporation

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cequivalent evaporation

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done boiler h.p.

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View Answer one boiler h.p.

During polytropic process_________________?


aheat transfer takes place across cylinder walls

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bwork is done

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csteam may be wet, dry or superheated after expansion

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dall of the above

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View Answer all of the above

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