Compressors, Gas Turbines and Jet Engines

This is an MCQ-based quiz on the topic of Compressors, Gas Turbines and Jet Engines.

This includes THE GAS TURBINE CYCLE, FUNDAMENTALS OF GAS TURBINE ENGINES, THE GAS TURBINE CYCLE, SOME BASIC PRINCIPLES, and many more.

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The following property is most important for material used for gas turbine blade

Toughness Fatigue Creep Corrosion resistance

The main purpose of reheating in gas turbine is to

Increase temperature Reduce turbine size Increase power output Increase speed

In the cross compounding of the gas turbine plant

H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine Both the arrangements can be employed All are connected in series

The advantage of multistage compression over single stage compression is

Lower power consumption per unit of air delivered Higher volumetric efficiency Decreased discharge temperature All of the above

1 m of air at atmospheric condition weighs approximately

0.5 kg 1.0 kg 1.3 kg 2.2 kg

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

Increases Decreases Remain same First increases and then decreases

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

Isothermal Isentropic Adiabatic Isochoric

Inter-cooling in gas turbine results in

Increase in net output but decrease in thermal efficiency Increase in thermal efficiency but decrease in net output Increase in both thermal efficiency and net output Decrease in both thermal efficiency and net output

Reheating in gas turbine results in

Increase of work ratio Decrease of thermal efficiency Decrease of work ratio Both (A) and (B) above

Reheating in multistage expansion gas turbine results in

High thermal efficiency Reduction in compressor work Decrease of heat loss in exhaust Maximum work output

Jet engines are classified into _______ types.

5 4 3 2

__________ bypass turbo fan engines are used in sub sonic flights.

Medium Low High None of the mentioned

_________ compressors are used in turbojets.

Axial Radial Axial & Radial None of the mentioned

Gas generator core is used in turbo fans.

True False