WorksheetsEngine Operation & Maintenance
Total questions: 50
Worksheet time: 50mins
Name
Class
Date
1.
What is the purpose of an engine firewall?
a)
It separates the hot section from the cold section.
b)
It separates the accessory gearbox from the main drive shaft.
c)
It ensures the hot air mixes with the cold air flow.
2.
What do you understand by a part throttle rated engine?
a)
Power intentionally limited to less than rated power.
b)
Take off power is available before full throttle position.
c)
Take off power is achieved on a cold day.
3.
When removing an engine for long-term storage, bleed valves should be
a)
removed.
b)
locked closed.
c)
open but blanked.
4.
Cracks may occur in hot section of engine components if during inspection with they are marked
a)
lead pencil.
b)
chalk.
c)
layout dye.
5.
How would you carry out compressor cleaning on a gas turbine engine with stubborn stain deposits?
a)
with grit blasting.
b)
use water with mixture of some chemicals.
c)
high speed water spray.
6.
The wires in the thermocouples probes are usually made from
a)
chromel and aluminium..
b)
cadmium and alumel.
c)
chromel and alumel.
7.
The Brayton cycle is known as the constant
a)
temperature cycle
b)
mass cycle
c)
pressure cycle
8.
The highest heat to metal contact in a jet engine is the
a)
burner cans
b)
turbine blades
c)
turbine inlet guide vanes
9.
The propulsive efficiency is
a)
low, with a low mass flow acceleration
b)
high, with a low mass flow acceleration
c)
high, with a high mass flow acceleration
10.
The variable inlet guide vanes are operated
a)
by fuel pressure
b)
electrically from cockpit
c)
using N1 fan speed
11.
What component creates a vortex in a gas turbine flame tube?
a)
Tertiary hole
b)
Swirl vanes
c)
Cascade vanes
12.
The function of a labyrinth seal is to create
a)
a restricted leakage of air between fixed and rotating components.
b)
an airtight seal between fixed and rotating components.
c)
an airtight seal between fixed adjacent casing surfaces.
13.
Reduced blade vibration and improved airflow characteristics in turbines are brought by
a)
shrouded turbine rotor blades
b)
impulse type blades
c)
fir tree blade attachment
14.
Reduced blade vibration and improved airflow characteristics in turbines are brought by
a)
A. shrouded turbine rotor blades
b)
B. impulse type blades
c)
C. fir tree blade attachment
15.
24. Cooling air for turbine blade utilizes H.P (high pressure) air which is fed into the blade via the
a)
A. trailing edge holes.
b)
B. blade root.
c)
C. grill holes.
16.
Engine rotor shaft oil seals are pressurised to ensure
a)
A. minimum oil loss.
b)
B. oil is forced into the bearings.
c)
C. that the oil is prevented from leaving the bearing housing.
17.
A carbon seal has which type of sealing arrangement?
a)
A. Full contact with race
b)
B. Full contact with casing
c)
C. Full contact with labyrinth
18.
Seals on a gas turbine engine restrict leakage of oil by
a)
A. spring pressure.
b)
B. closely tolerated contacting components.
c)
C. air pressure.
19.
Bearing seal failure would most probably cause
a)
A. high oil temperature
b)
B. high oil consumption
c)
C. low oil pressure
20.
What is the purpose of a radial drive shaft?
a)
A. To accommodate the components to the main gearbox.
b)
B. To transmit the drive from the internal gearbox to the external gearbox.
c)
C. To transmit the drive from the external gearbox to the auxiliary gearbox.
21.
The inputs received by the EEC (Electronic Engine Control) are analysed up to
a)
A. 60 times per second.
b)
B. 80 times per second.
c)
C. 70 times per second.
22.
The basic function of FADEC (Fully Authorised Digital Engine control) is to
a)
A. provides optimum engine efficiency for a given flight condition.
b)
B. provides precautionary alert.
c)
C. controls fuel metering only.
23.
Which of these characteristics is desirable in turbine engine oil?
a)
A. High volatility
b)
B. High flash point
c)
C. Low flash point
24.
A scavenge filter is incorporated in a gas turbine lubrication system to protect the
a)
A. scavenge pump
b)
B. oil cooler
c)
C. pressure pump
25.
What filters are used to protect oil pressure spray jets?
a)
A. Felt/paper filters
b)
B. Micronic filters
c)
C. In-line thread filters
26.
Oil picks up the most heat from which of the following turbine engine components?
a)
A. Compressor bearing
b)
B. Rotor coupling
c)
C. Turbine bearing
27.
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)
A. The oil pressure will be lower than normal
b)
B. The oil temperature and oil pressure will be higher than normal
c)
C. The oil pressure will be higher than normal
28.
Which of the following is a function of the fuel oil heat exchanger on a turbojet engine?
a)
A. Aerates the fuel
b)
B. Emulsifies the oil
c)
C. Increases fuel temperature
29.
In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a
a)
A. vent
b)
B. relief valve
c)
C. bypass valve
30.
What filter is used in an oil scavenge pump in the inlet side of the pump?
a)
A. Wire wound filter
b)
B. Threaded filter
c)
C. Wire mesh filter
31.
A jet engine gear box breather is prevented from leaking oil to atmosphere by the action of
a)
A. air or oil valve
b)
B. oil thrower ring and centrifugal force
c)
C. impeller and centrifugal force
32.
Why is an A.C.U fitted to a gas turbine engine?
a)
A. It increases the rate of acceleration of the engine
b)
B. It controls the operation of the metering block during sudden acceleration
c)
C. It limits the rate of increase in fuel flow during sudden acceleration
33.
Why is the B.P.C fitted in a gas turbine engine fuel system?
a)
A. To vary pressure pump output in relation to the pressure variation at the intake
b)
B. To proportion the fuel flow between primary and main burner lines
c)
C. To decrease the fuel flow to the burners with increased air intake pressure
34.
Specific fuel consumption at altitude will
a)
A. decrease
b)
B. increase
c)
C. remain constant
35.
A fuel heater prevents
a)
A. L.P filter icing
b)
B. H.P filter icing
c)
C. Neither
36.
During normal running conditions, combustion is
a)
A. self-supporting
b)
B. continuously supported by ignition
c)
C. intermittently supported by ignition
37.
To what condition does the fuel flow respond during aircraft acceleration?
a)
A. Mass airflow rate through the engine
b)
B. The effect of 'ram-air' at altitude
c)
C. The change in pressure at the compressor intake
38.
The B.P.C controls the F.C.U by
a)
A. pressure sensing
b)
B. temperature sensing
c)
C. density sensing
39.
A mixture ratio of 11:1 normally refers to
a)
A. 1 part air to 11 parts fuel volume
b)
B. a stoichiometric mixture
c)
C. 1 part fuel to 11 parts air in weight
40.
What causes the fuel divider valve to open in a turbine engine duplex fuel nozzle?
a)
A. An electrically operated solenoid
b)
B. Fuel pressure
c)
C. Bleed air after the engine reaches idle RPM
41.
If air is taken from the compressor for air conditioning or anti-icing thrust will
a)
A. increase EGT will increase
b)
B. decrease EGT will increase
c)
C. decrease EGT will decrease
42.
A 'hot start' with excessive temperatures may be caused by
a)
A. wrong grade of fuel
b)
B. throttle partly open
c)
C. high electrical power supply
43.
What type of turbine blade is most commonly used in air starter motors?
a)
A. Impulse
b)
B. Reaction
c)
C. Impulse-reaction
44.
After placing an engine into storage, details would be recorded in
a)
A. Technical Log
b)
B. Engine log book
c)
C. Aircraft log book
45.
The purpose of an undercurrent relay in a starter-generator system is to
a)
A. keep current flow to the starter-generator under the circuit capacity maximum
b)
B. disconnect power from the starter-generator and ignition when sufficient engine speed is reached
c)
C. provide a backup for the starter relay.
46.
Igniter plugs used in turbine engines are subjected to high intensity spark discharges and yet they have a long service life because they
a)
A. operate at much lower temperatures
b)
B. are not placed directly into the combustion chamber
c)
C. do not require continuous operation
47.
The purpose of silver plated or application of compound in the thread of ignite plug is to
a)
A. prevent hot corrosion.
b)
B. prevent seizing.
c)
C. prolong the life of ignite plug.
48.
The remedy for insufficient starter voltage in starter generator is
a)
A. charging the batteries.
b)
B. replacing switch.
c)
C. replacing the starter generator.
49.
In a turbo starting system, which of the following is the typical power source for engine starting?
a)
A. Bleed Air
b)
B. Battery
c)
C. Hydraulic Pressure
50.
Normal spark rate of a typical ignition plug is
a)
A. 60 to 100 sparks per sec.
b)
B. 6 to 100 sparks per minute.
c)
C. 60 to 100 sparks per minute.
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