Gas Turbines - Compressors: DGCA Technical General questions

Question 1

Compressor blades are designed to produce:

Accepted Answer

A steady velocity with a pressure rise over the engine speed range

Answer

A given pressure and velocity rise

Answer

A constant flow over the engine speed range

Answer

Turbulent flow into the combustion chamber

Question 2

A compressor stall causes:

Accepted Answer

An increase in the turbine gas temperature and the vibration level

Answer

The vibration level to increase with a decrease in the turbine gas temperature

Answer

The rotation of the engine to stop suddenly

Answer

The airflow through the engine to stop suddenly

Question 3

In a compressor:

Accepted Answer

The air temperature rises with a pressure rise

Answer

The air temperature is steady with a pressure rise

Answer

The air temperature falls with a pressure rise

Answer

The drop in air temperature is inversely proportional to the pressure rise

Question 4

In the event of a surge occurring the correct action to be taken is:

Accepted Answer

To close the throttle slowly

Answer

To close the throttle quickly

Answer

To open the throttle fully

Answer

To close the LP fuel valve

Question 5

Compressor blades increase in size:

Accepted Answer

From the high pressure section of the compressor to the low-pressure section

Answer

From the root to the tip to increase the temperature

Answer

From the low-pressure section of the compressor to the high-pressure section to maintain a constant airflow velocity

Answer

From the tip to the root to decrease the temperature

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