Gas Turbine Engines 1Front: On an axial flow, dual compressor forward fan engine, the fan turns the same speed as the: Back: low pressure turbine. Front: A turbo jet engine gives: Back: large acceleration to a small mass of air. Front: The basic gas tur

On an axial flow, dual compressor forward fan engine, the fan turns the same speed as the

low pressure turbine.

A turbo jet engine gives

large acceleration to a small mass of air.

The basic gas turbine engine is divided into two main sections: the cold section and the hot section

The hot section includes the combustor, turbine, and exhaust.

A jet engine derives its thrust by

reaction of the propelling gases.

Which of the following might be used to identify turbine discharge pressure?

Pt7.

In a free turbine

there is no mechanical connection with the compressor.

Bernoulli's Theorem states that at any point in a flow of gas

the total energy remains constant.

The working fluid of a gas turbine engine is

air.

Which statements are true regarding aircraft engine propulsion?

An engine driven propeller imparts a relatively small amount of acceleration to a large mass of air.

As subsonic air flows through a convergent nozzle the velocity

increases.

In a twin spool compressor system, the first stage turbine drives the

N2 compressor.

At what point in an axial flow turbojet engine will the highest gas pressures occur?

At the compressor outlet.

Which of the following units are generally used to measure aircraft noise?

Effective perceived noise decibels (EPNdB).

The diffuser section is located between

the compressor section and the burner section.

If the LP shaft shears

turbine runaway occurs.

The term Pt7 means

the total pressure at station No. 7.

What section provides proper mixing of the fuel and efficient burning of the gases?

Combustion section only.

Of the following, which engine type would most likely have a noise suppression unit installed?

Turbojet.

The pressure of supersonic air as it flows through a divergent nozzle

decreases.

The symbol for designating the speed of a LP compressor in a twin spool engine is

N1.

A turbojet engine is smoother running than a piston engine because

it has no reciprocating parts.

A gas turbine engine comprises which three main sections?

Turbine, compressor, and combustion.

When a volume of air is compressed

no heat is lost or gained.

The pressure of subsonic air as it flows through a convergent nozzle

decreases.

If a volume of air is 546 cubic feet at 273K, at 274K it will be

2 cubic feet greater.

In what section of a turbojet engine is the jet nozzle located?

Exhaust.

Newton's First Law of Motion (the Law of Inertia) states

Every body persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force.

A high bypass engine results in

overall slower airflow and greater propulsive efficiency.

Bernoulli's Theorem states that at any point in a flow of gas

the total energy remains constant.

The Brayton cycle is known as the constant

pressure cycle.

In a choked nozzle, velocity increases, and

pressure increases.

Using standard atmospheric conditions, the standard sea level temperature is

59°F.

Standard sea level pressure is

29.92 inches Hg.

The highest pressure in a gas turbine is

just after the last compressor stage but before the burner.

The velocity of subsonic air as it flows through a convergent nozzle

increases.

A turboprop engine derives its thrust by

reaction of the prop-wash.

Adiabatic compression is

one where there is no loss or gain of heat.

In a ducted fan engine, the fan is driven by the

turbine.

A modular constructed gas turbine engine means that

its major components can be removed and replaced without disturbing the rest of the engine.

The accessory gearbox of a high bypass engine is

on the HP Compressor housing.

On a gas turbine engine, what is the fan driven by?

LP turbine.

Which law relates to the kinetic, pressure, and potential energy in a fluid flow?

Bernoulli's theorem.

The density of gas may be expressed as

weight/volume.

E S HP is

Shaft horse power + exhaust efflux.

A divergent duct will cause subsonic flow to

decrease in velocity, increase pressure.

The Brayton cycle is

the continuous combustion cycle taking place in a gas turbine engine.

The purpose of a diffuser is to

increase the static pressure of the air.

On a triple spool engine, the first stage of turbines drive

intermediate pressure (IP) compressor

Ram effect is

conversion of kinetic energy to pressure energy at the face of the compressor.

On a high bypass ratio turbofan

both the compressor and combustion chamber are smaller than their turbojet equivalent.

In the dual axial flow or twin spool compressor system with a free power turbine, Nf would be an indication of

free power turbine speed.

A waisted drive shaft is primarily to

reduce weight

The 'core engine' or 'gas generator' is made up of

Turbine, combustion chamber, compressor.

The principle of jet propulsion is

every action has an equal and opposite reaction.

Boyle's law states that, at constant temperature, if a gas is compressed

its absolute pressure is inversely proportional to its volume.

What part of a jet engine has the most potential energy?

Just before the combustion chamber.