Compressors, Gas Turbines and Jet Engines MCQs

Question 1

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

Accepted Answer

Mean effective pressure

Answer

Compression index

Answer

Compression ratio

Answer

Compressor efficiency

Question 2

Axial flow compressor resembles

Accepted Answer

Turbine

Answer

Centrifugal pump

Answer

Reciprocating pump

Answer

Sliding vane compressor

Question 3

Cylinder clearance in a compressor should be

Accepted Answer

As small as possible

Answer

As large as possible

Answer

About 50% of swept volume

Answer

About 100% of swept volume

Question 4

The volumetric efficiency for reciprocating air compressors is about

Accepted Answer

70 to 90%

Answer

10 to 40%

Answer

40 to 60%

Answer

60 to 70%

Question 5

Isothermal compression efficiency, even when running at high speed, can be approached by using

Accepted Answer

Both (A) and (B) above

Answer

Multistage compression

Answer

Cold water spray

Answer

Fully insulating the cylinder

Question 6

A rotary compressor is driven by an

Accepted Answer

Either (A) or (B)

Answer

Electric motor

Answer

Engine

Answer

None of these

Question 7

The capacity of a compressor is expressed in

Accepted Answer

m3/min

Answer

kg/m2

Answer

kg/m3

Answer

m3/kg

Question 8

Ramjet engine

Accepted Answer

Is not self operating at zero flight speed

Answer

Is self operating at zero flight speed

Answer

Requires no air for its operation

Answer

Produces a jet consisting of plasma

Question 9

The blades of gas turbine are made of

Accepted Answer

High nickel alloy

Answer

Stainless steel

Answer

Carbon steel

Answer

High alloy steel