Gas Turbines - Combustion Chambers: DGCA Technical General questions

Question 1

To prevent compressor stall at the rear of the compressor, bleed valves must be positioned:

Accepted Answer

At the mid stages of the compressor

Answer

At the rear stages of the compressor

Answer

At the front stages of the compressor

Answer

At the intake of the engine

Question 2

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 3

Compressor surge will occur when:

Accepted Answer

All stages have stalled

Answer

All stages are at maximum efficiency

Answer

All stages are at maximum rpm

Answer

There is a partial breakdown of airflow through the compressor

Question 4

The pressure rise across each stage of an axial flow compressor is:

Accepted Answer

Between 1.1 and 1.2 to one

Answer

Greater than that of a centrifugal compressor

Answer

Between 3 and 5 to one

Answer

Twice the inlet pressure

Question 5

Under ideal conditions the pressure rise across a single-stage centrifugal compressor can be:

Accepted Answer

Not more than 4 to 1

Answer

1.1 or 1.2 to 1

Answer

1.5 to 1

Answer

30 to 1

35 more questions in this chapter, free with an account