Compressors Gas dynamics and Gas Turbines MCQ with Answers

Compressors Gas dynamics and Gas Turbines MCQ with Answers

81) The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Intercooler pressure, and p₃ = Delivery pressure o

Answer is:

p₂ = p₁ x p₃

82) The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.

Answer is:

less than

83) The pressure ratio in a centrifugal compressor can be increased by increasing the tip speed and lowering the inlet temperature.

Answer is:

Correct

84) Free air is the air at atmospheric conditions at any specific location.

Answer is:

Right

Explanation:

Free air delivery is the actual volume delivered by a compressor when reduced to the normal temperature and pressure conditions. The capacity of a compressor is generally given in terms of free air delivery.

85) A gas turbine used in air-craft should have low weight and small frontal area.

Answer is:

81) The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p1 = Intake pressure of air, p2 = Intercooler pressure, and p3 = Delivery pressure o

p2 = p1 x p3

82) The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.

less than

83) The pressure ratio in a centrifugal compressor can be increased by increasing the tip speed and lowering the inlet temperature.

Correct

84) Free air is the air at atmospheric conditions at any specific location.

Right

85) A gas turbine used in air-craft should have low weight and small frontal area.

Correct

81) The intercooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Intercooler pressure, and p₃ = Delivery pressure o

p₂ = p₁ x p₃