# Compressors, Gas Turbines and Jet Engines – Set 08

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## Q1. The temperature of air at the beginning of the compression stroke is __ the atmospheric temperature.

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

## Q2. Pick up the wrong statement about advantages of multistage compression

(A) Better lubrication is possible advantages of multistage
(B) More loss of air due to leakage past the cylinder
(C) Mechanical balance is better
(D) Air can be cooled perfectly in between

## Q3. The ratio of isentropic work to Euler’s work is known as

(A) Compressor efficiency
(B) Isentropic efficiency
(C) Euler’s efficiency
(D) Pressure coefficient

## Q4. During peak load periods, the best method of controlling compressors is

(A) Start-stop motor
(C) Relief valve
(D) Variable speed

## Q5. For perfect intercooling in a three stage compressor

(A) p₂/p₁ = p₃/p₂ = p₄/p₃
(B) p₃/p₁ = p₄/p₂
(C) p₁ p₂ = p₃ p₄
(D) p₁ p₃ = p₂ p₄

## Q6. A closed cycle gas turbine consists of a

(A) Compressor
(B) Heating chamber
(C) Cooling chamber
(D) All of these

## Q7. In a single acting reciprocating air compressor, without clearance, the compression of air may be

(A) Isothermal
(B) Polytropic
(C) Isentropic
(D) Any one of these

## Q8. The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called

(A) Slip factor
(B) Velocity factor
(C) Velocity coefficient
(D) None of the above

## Q9. Diffuser in a compressor is used to

(A) Increase velocity
(B) Make the flow streamline
(C) Convert pressure energy into kinetic energy
(D) Convert kinetic energy into pressure energy

## Q10. A compressor at high altitude will draw

(A) More power
(B) Less power
(C) Same power
(D) More/less power depending on other factors

## Q11. When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is __ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

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

## Q12. Which one of the following is the effect of blade shape on performance of a centrifugal compressor?

(A) Backward curved blades has poor efficiency
(C) Forward curved blades has higher efficiency
(D) Forward curved blades produce lower pressure ratio

## Q14. Losses in a centrifugal compressor are due to

(A) Inlet losses
(B) Impeller channel losses
(C) Diffuser losses
(D) All of the above

## Q15. For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

(A) Increase
(B) Decrease
(C) Remain unaffected
(D) Other factors control it

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