The propulsive efficiency is

high, with a low mass flow acceleration

low, with a low mass flow acceleration

high, with a high mass flow acceleration

The function of a labyrinth seal is to create

a restricted leakage of air between fixed and rotating components.

an airtight seal between fixed and rotating components.

an airtight seal between fixed adjacent casing surfaces.

Reduced blade vibration and improved airflow characteristics in turbines are brought by

A. shrouded turbine rotor blades

Engine rotor shaft oil seals are pressurised to ensure

B. oil is forced into the bearings.

C. that the oil is prevented from leaving the bearing housing.

Seals on a gas turbine engine restrict leakage of oil by

B. closely tolerated contacting components.

What is the purpose of a radial drive shaft?

B. To transmit the drive from the internal gearbox to the external gearbox.

A. To accommodate the components to the main gearbox.

C. To transmit the drive from the external gearbox to the auxiliary gearbox.

The basic function of FADEC (Fully Authorised Digital Engine control) is to

A. provides optimum engine efficiency for a given flight condition.

B. provides precautionary alert.

C. controls fuel metering only.

What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?

A. The oil pressure will be lower than normal

B. The oil temperature and oil pressure will be higher than normal

C. The oil pressure will be higher than normal

A jet engine gear box breather is prevented from leaking oil to atmosphere by the action of

C. impeller and centrifugal force

B. oil thrower ring and centrifugal force

Why is an A.C.U fitted to a gas turbine engine?

C. It limits the rate of increase in fuel flow during sudden acceleration

A. It increases the rate of acceleration of the engine

B. It controls the operation of the metering block during sudden acceleration

Why is the B.P.C fitted in a gas turbine engine fuel system?

A. To vary pressure pump output in relation to the pressure variation at the intake

B. To proportion the fuel flow between primary and main burner lines

C. To decrease the fuel flow to the burners with increased air intake pressure

During normal running conditions, combustion is

B. continuously supported by ignition

C. intermittently supported by ignition

To what condition does the fuel flow respond during aircraft acceleration?

A. Mass airflow rate through the engine

B. The effect of 'ram-air' at altitude

C. The change in pressure at the compressor intake

A mixture ratio of 11:1 normally refers to

A. 1 part air to 11 parts fuel volume

C. 1 part fuel to 11 parts air in weight

What causes the fuel divider valve to open in a turbine engine duplex fuel nozzle?

A. An electrically operated solenoid

C. Bleed air after the engine reaches idle RPM

A 'hot start' with excessive temperatures may be caused by

C. high electrical power supply

The purpose of an undercurrent relay in a starter-generator system is to

B. disconnect power from the starter-generator and ignition when sufficient engine speed is reached

A. keep current flow to the starter-generator under the circuit capacity maximum

C. provide a backup for the starter relay.

Igniter plugs used in turbine engines are subjected to high intensity spark discharges and yet they have a long service life because they

C. do not require continuous operation

A. operate at much lower temperatures

B. are not placed directly into the combustion chamber

The purpose of silver plated or application of compound in the thread of ignite plug is to

C. prolong the life of ignite plug.

The remedy for insufficient starter voltage in starter generator is

C. replacing the starter generator.

Normal spark rate of a typical ignition plug is

C. 60 to 100 sparks per minute.

Engine Operation & Maintenance

Authored by Muhammad Bakar

Instructional Technology

University

Used 4+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the purpose of an engine firewall?

It separates the hot section from the cold section.

It separates the accessory gearbox from the main drive shaft.

It ensures the hot air mixes with the cold air flow.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What do you understand by a part throttle rated engine?

Power intentionally limited to less than rated power.

Take off power is available before full throttle position.

Take off power is achieved on a cold day.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When removing an engine for long-term storage, bleed valves should be

removed.

locked closed.

open but blanked.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Cracks may occur in hot section of engine components if during inspection with they are marked

lead pencil.

chalk.

layout dye.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How would you carry out compressor cleaning on a gas turbine engine with stubborn stain deposits?

with grit blasting.

use water with mixture of some chemicals.

high speed water spray.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The wires in the thermocouples probes are usually made from

chromel and aluminium..

cadmium and alumel.

chromel and alumel.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The Brayton cycle is known as the constant

temperature cycle

mass cycle

pressure cycle

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Engine Operation & Maintenance

What is the purpose of an engine firewall?

What do you understand by a part throttle rated engine?

When removing an engine for long-term storage, bleed valves should be

Cracks may occur in hot section of engine components if during inspection with they are marked

How would you carry out compressor cleaning on a gas turbine engine with stubborn stain deposits?

The wires in the thermocouples probes are usually made from

The Brayton cycle is known as the constant

The highest heat to metal contact in a jet engine is the

The propulsive efficiency is

The variable inlet guide vanes are operated

Access all questions and much more by creating a free account

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