MECHANICAL ENGINEERING (COMPRESSORS, GAS TURBINE & JET ENGINES) MCQs

The most efficient method of compressing air is to compress it

Correct! Wrong!

Adiabatic compression is one in which

Correct! Wrong!

Maximum work is done in compressing air when the compression is

Correct! Wrong!

The compressor capacity with decrease in suction temperature

Correct! Wrong!

An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes

Correct! Wrong!

Compression efficiency is compared against

Correct! Wrong!

Aeroplanes employ following type of compressor

Correct! Wrong!

Ratio of indicated H.P. and brake H.P. is known as

Correct! Wrong!

Cylinder clearance in a compressor should be

Correct! Wrong!

Volumetric efficiency is

Correct! Wrong!

The ratio of work doen per cycle to the swept volume in case of compressor is called

Correct! Wrong!

Euler’s equation is applicable for

Correct! Wrong!

In multistage compressor, the isothermal compression is achieved by

Correct! Wrong!

Separators in compressor installations are located

Correct! Wrong!

During peak load periods, the best method of controlling compressors is

Correct! Wrong!

To aviod moisture troubles, the compressed air main line should

Correct! Wrong!

During base load operation, the best method of controlling compressor is

Correct! Wrong!

The ratio of isentropic work to Euler work is known as

Correct! Wrong!

The criterion of the thermodynamic efficiency for rotary compressor is

Correct! Wrong!

Losses in a centrifugal compressor are due to

Correct! Wrong!

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called

Correct! Wrong!

Axial flow compressor has the following advantage over centrifugal compressor

Correct! Wrong!

Axial flow compressor resembles

Correct! Wrong!

Gas turbines for power generation are normally used

Correct! Wrong!

Actual compression curve is

Correct! Wrong!

Gas turbine works on

Correct! Wrong!

Mechanical efficiency of gas turbines as compared to I.C engines is

Correct! Wrong!

The air-fuel ratio in gas turbines is of the order of

Correct! Wrong!

Efficiency of gas turbine is increased by

Correct! Wrong!

The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

Correct! Wrong!

The material commonly used for air craft gas turbine is

Correct! Wrong!

Water is injected in gas turbine cycle to

Correct! Wrong!

In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

Correct! Wrong!

In jet engines, paraffin is usually used as the fuel because of its

Correct! Wrong!

A jet engine works on the principle of conservation of

Correct! Wrong!

A rocket engine for the combustion of its fuel

Correct! Wrong!

The air entry velocity m a rocket as compared to aircraft is

Correct! Wrong!

The blades of gas turbine are made of

Correct! Wrong!

Fighter bombers use following type of engine

Correct! Wrong!

Reheating in gas turbine results in

Correct! Wrong!

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