Compressors, Gas Turbines and Jet Engines MCQs

Question 1

To avoid moisture troubles, the branch connections from compressed air lines should be taken from

Accepted Answer

Top side of main

Answer

Bottom side of main

Answer

Left side of main

Answer

Right side of main

Question 2

As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

Accepted Answer

Increases

Answer

Decreases

Answer

Remain same

Answer

First increases and then decreases

Question 3

If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

Accepted Answer

Isothermal

Answer

Isentropic

Answer

Adiabatic

Answer

Isochoric

Question 4

Inter-cooling in gas turbine results in

Accepted Answer

Increase in net output but decrease in thermal efficiency

Answer

Increase in thermal efficiency but decrease in net output

Answer

Increase in both thermal efficiency and net output

Answer

Decrease in both thermal efficiency and net output

Question 5

Reheating in gas turbine results in

Accepted Answer

Both (A) and (B) above

Answer

Increase of work ratio

Answer

Decrease of thermal efficiency

Answer

Decrease of work ratio

Question 6

Reheating in multistage expansion gas turbine results in

Accepted Answer

Maximum work output

Answer

High thermal efficiency

Answer

Reduction in compressor work

Answer

Decrease of heat loss in exhaust

Question 7

In turbo fan engine, the jet velocity as compared to turbojet engine is

Accepted Answer

Less

Answer

More

Answer

Same

Answer

May be less or more depending upon speed

Question 8

Which is false statement about air receivers?

Accepted Answer

These increase compressor efficiency

Answer

These are used to dampen pulsations

Answer

These act as reservoir to take care of sudden demands

Answer

These knock out some oil and moisture

Question 9

For speed above 3000 km/hour, it is more advantageous to use

Accepted Answer

Ramjet engine

Answer

Turbojet engine

Answer

Propellers

Answer

Rockets