GATE AE Centrifugal Compressor PYQs & Answers

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Centrifugal Compressor

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Questions 1–9 of 9. Imported answers require independent review unless marked reviewed.

Topic practice 9 questionsPage 1 of 1

A centrifugal compressor has a constant-width radial diffuser. The diameters at the diffuser inlet and outlet are 0.2 m and 0.3 m, respectively. The flow at the diffuser inlet and outlet is assumed to be steady and uniform. The average velocity at the diffuser inlet and outlet are

m/s and

m/s, respectively. If the flow through the diffuser is treated as steady and incompressible, the value of

is ________ (rounded off to the nearest integer).

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In a centrifugal compressor, the eye tip diameter is 10 cm. For a shaft rotational speed of 490 rotations per second, the tangential speed at the inducer tip is ____ m/s (rounded off to one decimal place).

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A centrifugal compressor is designed to operate with air. At the leading edge of the tip of the inducer (eye of the impeller), the blade angle is

, and the relative Mach number is 1.0. The stagnation temperature of the incoming air is 300 K. Consider

. Neglect pre-whirl and slip. The inducer tip speed is ________ m/s (rounded off to the nearest integer).

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The operating characteristics of a pump were measured to be

, where power coefficient

is the flow coefficient,

is a constant, D is a length scale,

is the rotation rate,

is fluid density, and P is the power required. The flow coefficient is a dimensionless volume flow rate scaled with

and D. Assuming that the flow rate remains the same, if the rotation rate is increased to

, the power changes to

. The value of

is _______. (round off to two decimal places)

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A centrifugal air compressor has inlet root diameter of 0.25 m and the outlet diameter of the impeller is 0.6 m. The pressure ratio is 5.0. The air at the inlet of the rotor is at 1 atm and 25°C. The polytropic efficiency is 0.8 and slip factor is 0.92. Use

kJ/kg-K and

. The impeller speed in revolutions per minute (RPM) is __________. (round off to the nearest integer)

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The ratio of exit stagnation pressure to inlet stagnation pressure across the rotating impeller of a centrifugal compressor, operating with a closed exit, is

Your answerChoose one option.

0.5

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The relative velocity of air leaving a straight radial impeller of a centrifugal compressor is 100 m/s. If the impeller tip speed is 200 m/s, for a slip free operation, the absolute velocity (in m/s) at the impeller exit is ________ (accurate to one decimal place).

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In the vane-less space between the impeller and the diffuser vanes in a Centrifugal Compressor, the angular momentum varies in the following manner in the radial direction

Your answerChoose one option.

Increases

Remains constant

Decreases

First increases and then decreases

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A centrifugal compressor requires 1800 kW of power to compress 10 kg/s of air. Consider the whirl velocity component is equal to the impeller speed (i.e., no slip) and no losses in the impeller. If the impeller has to rotate at 1900 rad/s, the diameter of the impeller is to be ________ m (in two decimal place).

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GATE AE Centrifugal Compressor PYQs

How to practice Centrifugal Compressor

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