Unit 5: Part 1

A gas compression process is

• adiabatic

• involves heat transfer

• both of the mentioned

• none of the mentioned

If the gas is cooled during compression, work required will be ____ the adiabatic compression work.

• more than

• equal to

• less than

• none of the mentioned

The work of compression is ____ the shaft work.

• positive of

• negative of

• equal to

• less than

The volumetric efficiency is defined as the ratio of

• total volume / piston displacement volume

• total volume / gas volume taken during suction

• swept volume / gas volume taken during suction

• gas volume taken during suction / swept volume

A power cycle continuously converts ____ into ____

• heat, heat

• work, heat

• heat, work

• work, work

In the vapour power cycle, working fluid undergoes a change of phase.

• false

• true

The path followed in a vapour power cycle is

• boiler-condenser-turbine-pump

• boiler-turbine-condenser-pump

• boiler-turbine-pump-condenser

• boiler-pump-turbine-condenser

For a fluid undergoing cycle process,

• there is no net change in its internal energy

• energy transfer as heat is equal to the energy transfer as work

• both of the mentioned

• none of the mentioned

For a vapour power cycle,

• net heat input is converted into net work output

• Q1-Q2 = Wt-Wp

• efficiency = 1 – (Q2/Q1)

• all of the mentioned

In a Rankine cycle, all the processes are ideal.

• true

• false