Jet Engine and Turbine Multiple Choice Questions

On an axial flow, dual compressor forward fan engine, the fan rotates at the same speed as the:

• Low pressure turbine (LP turbine)

• High pressure compressor (HP compressor)

• High pressure turbine

• Intermediate pressure compressor

A turbojet engine produces thrust by:

• Imparting a large acceleration to a small mass of air

• Imparting a large acceleration to a large mass of air

• Imparting a small acceleration to a large mass of air

• Imparting equal acceleration to all airflow

The hot section of a gas turbine engine consists of:

• Compressor, combustor, and turbine

• Combustor, diffuser, and exhaust

• Combustor, turbine, and exhaust

• Compressor, turbine, and exhaust

Jet engine thrust is generated by:

• Drawing air into the compressor

• Impingement of exhaust gases on ambient air

• Reaction of the exhaust gases

• Pressure difference across the compressor

Which notation represents turbine discharge total pressure?

• Pt7

• Pt2

• Tt7

• P7

In a free turbine engine:

• A clutch connects the compressor and output shaft

• A free-wheel unit connects the shafts

• There is no mechanical connection between compressor and power turbine

• The compressor directly drives the propeller

Bernoulli’s theorem states that in a flowing fluid:

• Static pressure equals dynamic pressure

• Static pressure is always less than dynamic pressure

• Total energy remains constant along a streamline

• Velocity is always constant

The working fluid in a gas turbine engine is:

• Fuel

• Combustion gases

• Air

• Air-fuel mixture

Which statement about propulsion is correct?

• Turbojets accelerate a small mass of air to high velocity

• Turboprops accelerate a small mass of air to high velocity

• Propellers accelerate a large mass of air to low velocity

• Turbofans accelerate equal masses of air at equal speeds

For subsonic flow in a convergent nozzle, velocity will:

• Decrease

• Increase

• Remain constant

• Become sonic immediately