AGTE FUNDAMENTALS

When gases pass through a convergent duct their:

• A) velocity and temperature increase and their pressure decreases

• B) their velocity increases and their temperature and pressure decrease

• C) their velocity decreases and their temperature and pressure increase

• D) they expand adiabatically

Select the correct order of best propulsive efficiency, from low to high airspeed.

• A) High bypass ratio turbojet, Low bypass ratio turbojet, Pure turbojet, Turboprop

• B) Low bypass ratio turbojet, Pure turbojet, Turboprop, High bypass ratio turbojet

• C) Pure turbojet, Turboprop, High bypass ratio turbojet, Low bypass ratio turbojet

• D) Turboprop, High bypass ratio turbojet, Low bypass ratio turbojet, Pure turbojet

The highest pressure in a gas turbine engine occurs:

• A) between the compressor and the combustion chamber

• B) in the combustion chamber

• C) in the jet pipe

• D) at the P1 probe

In a turbofan engine, the fan speed is controlled by:

• A)

  a reduction gear

• B)

  a wastegate

• C) the turbine

• D) varying the pitch

In a High Bypass Ratio engine:

• A) all of the air goes through both the low and high pressure compressors

• B) not all the air goes through the high pressure compressor

• C) not all the air goes through the low pressure compressor

• D) all the air goes through the high pressure compressor

Modular construction:

• A) is only used on turboprop engines

• B) cannot be used on high ratio engines

• C) has a weight saving function

• D) enables malfunctioning sections of the engine to be changed without changing the whole engine

The Bypass Ratio of an engine is the ratio of:

• A) primary air to tertiary air

• B) cold stream air to that flowing through the hot core of the engine

• C) exhaust gas pressure to air intake pressure

• D) primary air to secondary air

The Gas Turbine Engine uses the principle of:

• A) Newton’s Third Law of motion

• B) creating thrust equal to the weight of the aircraf

• C) expelling air at the same speed as that of the aircraf

• D) the fluid flywheel

The addition of heat in a combustion chamber allows a:

• A) large expansion at a substantially constant pressure

• B) large expansion at a constant volume

• C) large expansion at a decreasing static pressure

• D) minimum expansion at a constant volume

A Bypass Ratio of 5:1 means that:

• A) 5 pounds of air is bypassed for every 10 pounds entering the engine intake

• B) 5 pounds of goes through the HP compressor for every 10 pounds that enters the intake

• C) 10 pounds of air goes through the bypass for every 5 pounds that enters the intake

• D) 5 pounds of air is bypassed for every 1 pound that goes through the hot core of the engine