# Compressors, Gas Turbines and Jet Engines – Set 10

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## Q1. If the flow of air through the compressor is parallel to its axis, then the compressor is

(A) Reciprocating compressor
(B) Centrifugal compressor
(C) Axial flow compressor
(D) Turbo compressor

## Q2. A compressor at high altitudes will require __ power.

(A) Same
(B) Less
(C) More
(D) None of these

## Q3. The volume of air delivered by the compressor is called

(A) Free air delivery
(B) Compressor capacity
(C) Swept volume
(D) None of these

## Q4. The pressure ratio of an ideal vaned compressor with increase in mass flow rate

(A) Increases
(B) Decreases
(C) Remain constant
(D) First decreases and then increases

## Q5. Pick up the wrong statement

(A) Centrifugal compressors deliver practically constant pressure over a considerable range of capacities
(B) Axial flow compressors have a substantially constant delivery at variable pressures
(C) Centrifugal compressors have a wider stable operating range than axial flow compressors
(D) Axial flow compressors are bigger in diameter compared to centrifugal type

## Q6. Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is

(A) Higher
(B) Lower
(C) Equal
(D) Can’t be compared

(A) (p₁ – p₂)/2
(B) (p₁ + p₂)/2
(C) p₁/p₂
(D) p₁ p₂

## Q8. The compression ratio for the compressor is always _ unity.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

## Q9. Efficiency of gas turbine is increased by

(A) Reheating
(B) Inter cooling
(C) Adding a regenerator
(D) All of the above

(A) 1.03 kg/cm²
(B) 1.06 kg/cm²
(C) 1.00 kg/cm²
(D) 0.53 kg/cm²

## Q11. The work ratio of a gas turbine plant is defined as the ratio of

(A) Net work output and heat supplied
(B) Net work output and work done by turbine
(C) Actual heat drop and isentropic heat drop
(D) Net work output and isentropic heat drop

## Q12. The inlet pressure is always __ the discharge pressure.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

Q13. In a centrifugal compressor, an increase in speed at a given pressure ratio causes

(A) Increase in flow
(B) Decrease in flow
(C) Increase in efficiency
(D) Increase in flow and decrease in efficiency

## Q14. Euler’s equation can be used for

(A) Radial flow compressors
(B) Axial flow compressors
(C) Pumps
(D) All of these

## Q15. Gas turbine blades are given a rake

(A) Equal to zero
(B) In the direction of motion of blades
(C) Opposite to the direction of motion of blades
(D) Depending on the velocity

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