gas turbine compressor

#15. The purpose of the diffuser vanes in a centrifugal compressor is to:

• AIncrease the charge temperature.
• BConvert pressure energy into kinetic energy.
• CIncrease the air velocity.
• DConvert kinetic energy into pressure energy.

#1. The pressure ratio of a gas turbine engine compressor is:

• AEqual to the number of compression stages.
• BThe ratio between compressor outlet and compressor inlet pressure.
• CThe ratio between exhaust inlet and exhaust outlet pressure.
• DNever greater than 5 to 1.

#2. The compressor idling speed of a gas turbine engine will increase:

• AAt higher ambient temperature.
• BWith higher than sea level density.
• CAt altitudes lower than sea level.
• DAt lower ambient temperature.