TURBINE MIDTERM 2

Select a cause of a low air density condition from the following:

High temperature

Low temperature

Low humidity

Low altitude

Which of the following best defines the term “power”?

A change in velocity with respect to time

The capacity to do work

Force multiplied by distance

The time rate of doing work

What affect does a convergent duct have on static air pressure?

Pressure will increase

Pressure will decrease

It will not have an affect on static pressure; only dynamic pressure and thrust will change

Who cares; I hate the Habs

Which of the following defines the relationship between pressure and volume in a jet engine ...

Bernoulli’s principle

Brayton cycle

Otto cycle

Uni cycle

Where is the highest static pressure zone in a gas turbine engine?

Inlet to the compressors

Diffuser section

Combustion chamber

Exhaust nozzle

Choose the correct statement from the following:

Thrust increases as temperature decreases

Thrust increases as temperature increases

Thrust increases as density decreases

Thrust is measured in pounds per square inch

Which of the following best describes an engine’s thermal efficiency?

Ratio of kinetic energy to useful work produced by the engine

Ratio of the work produced by the engine to the fuel energy input

It is a measure of the fuel consumption rate

Ratio of exhaust gas temperature versus thrust

Identify the exhaust gas velocity to aircraft speed ratio that has the greatest propulsive efficiency

6:1

4:1

2:1

1:1

Identify an advantage of using a modular engine construction

There are fewer moving parts

It takes less time to remove the engine from the aircraft

Reduced maintenance costs

Who cares; I hate the Habs

Which type of duct design is used on a subsonic aircraft?

Divergent

Convergent

Detergent

Reverse flow

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