Aircraft Engines: Instruments and Systems

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1
A turbo-prop engines torque meter measures the
  • Bow of the shaft
  • Speed of the shaft
  • Twist of the shaft
2
In a multi-thermocouple system, if one probe is unserviceable
  • The reading pulses to 100'
  • It has no effect
  • The reading increases by 5 to 10%
3
The tacho-indicator magnet is driven by
  • An induction motor
  • A DC motor
  • A synchronous motor
4
A ballast resistor is fitted
  • In series, to give identical resistance values for all airframes
  • In parallel, to give indentical readings for all engines
  • In parallel, to give identical resistance values for all engines
5
The tacho-indicator is driven by
  • An induction motor
  • A DC motor
  • A synchronous motor
6
A boost gauge measures
  • Gauge pressure at the injector
  • Absolute pressure on the inlet port
  • Brake mean effective pressure
7
In a multi-thermocouple system, if one probe is unserviceable
  • The reading pulses to 100'
  • The reading increases by 5 to 10%
  • It has no effect
8
A DC ratiometer is indicating in reverse. The cause of this is most likely the
  • Earth is not connected
  • Sensing inputs are connected the wrong way around
  • Sensing unit is faulty
9
A manifold pressure (Boost) gauge is compensated for the effects of altitude by
  • Spring pressure in the sealed bellows
  • The application of atmospheric pressure to both bellows
  • A sensor in the supercharger
10
In an EGT system, cold junction temperature compensation for the instrument moving coil is achieved by a
  • Bimetal spring
  • Thermistor
  • Resistor
11
In an EGT system, cold junction temperature compensation for the instrument moving coil is achieved by a
  • Resistor
  • Bimetal spring
  • Thermistor
12
A tachogenerator indicator takes its reading from
  • Eddys in the drag cup
  • A fixed frquency
  • Variable frequencies depending on the rotor speed
13
The speed of the motor in the tacho-indicator depends on
  • Current
  • Frequency
  • Voltage
14
An EPR indicator is
  • A single indicator mounted in the instrument panel with a correction card
  • A single indicator mounted in the instrument panel
  • Two independent inicators mounted in the instrument panel
15
A broadband vibration reading indicates
  • The average vibration
  • The peak allowable vibration
  • The N1 vibration
16
The speed of the motor in the tacho-indicator depends on
  • Frequency
  • Current
  • Voltage
17
An EPR indicator is
  • Two independent inicators mounted in the instrument panel
  • A single indicator mounted in the instrument panel
  • A single indicator mounted in the instrument panel with a correction card
18
A Bourbon tube instrument may be used to indicate
  • Position and quantity
  • Pressure, temperature, position and quantity
  • Pressure and temperature
19
What determines the type of thermocouple materials used in a temperature indication system
  • Length of connecting wires
  • Resistance change of the wires
  • Temperature range of the measured system
20
The temperature of the cylinder head is measured by
  • A mercury gauge
  • Two dissimilar metals bonded together which provide a voltage
  • Two dissimilar metals bonded together which expand/contract at different rates
21
An EGT system normally indicates in
  • A percentage
  • 'F
  • 'C
22
An EPR system uses the pressure ratio of
  • Inlet / Outlet
  • Outlet / Inlet
  • Outlet / Inlet-outlet
23
An EGT system normally indicates in
  • 'F
  • A percentage
  • 'C
24
A CIT sensor is made up of
  • Iron-constantan
  • Platinum-rhodium
  • Chromel-alumel
25
An EPR system uses the pressure ratio of
  • Inlet / Outlet
  • Outlet / Inlet-outlet
  • Outlet / Inlet
26
A D.C. ratiometer type temperature indicator goes to zero in flight, this could be caused by
  • A short circuit in the temperature sensor connector
  • Temperature sensor going open circuit
  • A high resistance value in the leads to the indicator
27
The temperature bulb used in an oil temperature indicating system uses a material where
  • Expansion is proportional to temperature
  • Resistance is proportional to temperature
  • Pressure is proportional to temperature
28
On an engine run, the EPR indicator reads below 1. The possible cause is
  • Failure of a thermocouple
  • A leak in the high pressure system
  • A leak in the low pressure system
29
A common type of electrically operated oil temperature gauge utilizes
  • Either a wheatstone bridge or ratiometer
  • Vapour pressure and pressure switches
  • A thermocouple type circuit
30
A fuel flow transmitter requires a motor or a synchronous motor to have a
  • Constant frequency within small tolerances
  • Low EMF as it is immersed in fuel
  • Constant voltage within small tolerances
31
A rapid response type thermocouple is fitted to a
  • Turbo-prop engine
  • Piston engine
  • Turbojet engine
32
A rapid response type thermocouple is fitted to a
  • Piston engine
  • Turbo-prop
  • Turbojet
33
Manifold pressure is measured in
  • Inches Hg
  • Mb
  • Lbs/sq in.
34
In an oil temperature indicating system, there is a break in the circuit to the bulb. This will give
  • Zero indication
  • No scale deflection
  • Full-scale deflection
35
What will be the indication in an EPR system if the aircraft encountes a headwind with no power change
  • Indication will stay the same
  • Indication will decrease
  • Indication will increase
36
A sensing element goes open circuit in a ratiometer. What will happen
  • Full scale deflection
  • Hairspring takes indicator off scale
  • Temperature indicates below ambient
37
A red triangle, dot or diamond mark on an engine face or glass indicates
  • The maximum operating limit for all normal operation
  • A restricted operating range
  • The maximum limit for high transients such as starting
38
In an oil temperature indicating system, there is a break in the circuit to the bulb. This will give
  • Full-scale deflection
  • No scale deflection
  • Zero indication
39
A short circuit in a DC ratiometer will give
  • Maximum scale reading
  • Zero scale reading
  • Minimum scale reading
40
On a modern airliner, an air start systen may use air from an
  • External source, an APU or another engine
  • External source only
  • External source and another engine only
41
The filter used in an accelerometer type vibration system is a
  • Band pass
  • High pass
  • Low pass
42
The supply to an AC ratiometer instrument is
  • 115V 3 phase 400Hz AC
  • Single-phase AC
  • 28 Volts DC
43
When carrying out an EGT calibration,
  • 20'C should always be used
  • The ambient temperature should never be taken into account
  • The ambient temperature should always be taken into account
44
The supply to an AC ratiometer instrument is
  • 28 Volts DC
  • Single-phase AC
  • 115V 3 phase 400Hz AC
45
An oil temperature indicator runs back to zero on an engine run. The problem cause is
  • Indicator pins are shorted together
  • Temperature bulb is an open circuit
  • Temperature bulb is a short circuit
46
A thermocouple is made up of
  • 3 dissimilar metals welded together
  • 2 dissimilar metals with an air gap between them
  • 2 dissimilar metals welded together
47
A thermocouple is made up of
  • 3 dissimilar metals welded together
  • 2 dissimilar metals with an air gap between them
  • 2 dissimilar metals welded together
48
The filter used in an accelerometer type vibration system is a
  • Band pass
  • High pass
  • Low pass
49
A tachogenerator, to indicate revs/min, requires
  • 28V DC aircraft electrical system
  • 115V AC from aircraft electrical system
  • No power supply
50
When carrying out an EGT calibration,
  • The ambient temperature should always be taken into account
  • 20'C should always be used
  • The ambient temperature should never be taken into account
51
An oil temperature indicator runs back to zero on an engine run. The probable cause is
  • Indicator pins are shorted together
  • Temperature bulb is an open circuit
  • Temperature bulb is a short circuit
52
A ratiometer type indicator has
  • One coil, a non linear air gap
  • Two coils, a linear air gap
  • A non-linear air gap, two coils
53
A fuel flow-meter works on principle of a
  • Drum rotating continuosly and impeller lagging
  • Drum and impeller rotating together
  • Impeller rotating continuosly and impeller lagging
54
A tachogenerator output is
  • Three phase AC
  • DC
  • Single-phase AC
55
A synchro pressure measuring system requires
  • Direct current
  • Either AC or DC
  • Alternating current
56
A tachogenerator engine speed indication system requires
  • 115 volts AC
  • 28 volts DC
  • No external power
57
In a fuel flow-meter using a vane, the danger caused by the possibility of the vane sticking overcome by
  • Applying vibration
  • A differential pressure
  • A bypass valve
58
A ratiometer type indicator has
  • Two coils, a linear air gap
  • A non-linear air gap, two coils
  • One coil, a non linear air gap
59
A synchro prssure measuring system works on the principle of changes in pressure related changes in
  • Voltage
  • Frequency
  • Flux
60
A fuel flow-meter works on principle of a
  • Impeller rotating continuosly and impeller lagging
  • Drum rotating continuosly and impeller lagging
  • Drum and impeller rotating together
61
A tachogenerator output is
  • Single-phase AC
  • DC
  • Three-phase AC
62
To read oil pressure direct from the source, you would use
  • A sensitive capsule
  • A bourdon tube
  • An electrical transmitter
63
A thermocouple indicator is basically a
  • Millameter
  • Millivoltmeter
  • Milliohmeter
64
A tacho pointer is moved by
  • An AC servo motor
  • A drag cup coupling
  • A synchronous motor
65
100% is set on an RPM gauge when
  • Maximum speed is attained during test bed runs
  • HP speed = LP SPEED
  • Maximum take-off power is used on an air test
66
In a ratiometer system, for what is the spring in the indicator.
  • To take the pointer off scale in the event of power failure
  • To act as a damping force
  • To act as a controlling force
67
A thermocouple indicator is connected to the
  • Hot junction
  • Cold junction
  • Difference between the hot junction and the cold junction
68
To read oil pressure direct from the source, you would use
  • A sensitive capsule
  • A bourdon tube
  • An electrical transmitter
69
A pulse probe system uses
  • Variable reluctance to produce an output
  • Variable resistance to produce an output
  • Variable inductance to produce an output
70
In a fuel flow-meter using a vane, the danger caused by the possibility of the vane sticking overcome by
  • A differential pressure
  • A bypass valve
  • Applying vibration
71
A typical torquemeter is
  • Direct reading type
  • A synchornous motor type
  • A differential pressure type
72
With the engine stopped on the ground, a manifold pressure gauge would read
  • One
  • Airfield pressure
  • Zero
73
In a ratiometer system, for what is the spring in the indicator.
  • To take the pointer off scale in the event of power failure
  • To act as a damping force
  • To act as a controlling force
74
A pulse probe system uses
  • Variable inductance to produce an output
  • Variable reluctance to produce an output
  • Variable resistance to produce an output
75
A tachogenerator used to measure rev/miin in turbine engines
  • 115V AC is required
  • 28V DC is required
  • Develops its own power for the system
76
An AC type of tachometer
  • Needs input DC voltage
  • Needs input AC voltage
  • Needs no electrical power
77
A temperature indicating system incorporating a resistance bulb on a selected range has pointer movement
  • Inversely proportional to bulb resistance
  • Resistance does not affect pointer movement
  • Proportional to bulb resistance
78
A thermocouple indication is taken from the
  • Difference between the hot junction and the cold junction
  • Hot junction
  • Cold junction
79
An aircraft fuel flow meter normally indicates
  • Rates of fuel consumption
  • Velocity of the fuel
  • Rate of refuelling the aircraft
80
A thermocouple indicator is basically a
  • Milliameter
  • Millivoltmeter
  • Milliohmeter
81
EGT is displayed in
  • K'
  • F'
  • C'
82
EGT thermocouples are usually made of
  • Chromel and platinum
  • Chromel and alumel
  • Nickel and platinum
83
A thermocouple is constructed of
  • Three dissimilar metals welded together
  • Two dissimilar metals welded together
  • Two dissimilar metals withan air gap between them
84
A thermocouple sensing system test set requires
  • No power
  • A serviceable battery
  • 24V DC
85
An engine oil temperature gauge indicates the temperature of the oil
  • Entering the engine
  • At the oil cooler
  • In the oil storage tank
86

Engine pressure ratio is determined by
  • Dividing engine inlet total pressure by turbine outlet total pressure
  • Multiplying engine inlet total pressure by turbine outlet total pressure
  • Dividing turbine outlet total pressure by engine inlet total pressure
87
A torque pressure measuring indicator is fed with
  • Servo operated
  • Differential pneumatic pressure
  • Direct oil pressure
88
A typical torqumeter is
  • A differential pressure type
  • A synochronous motor type
  • Direct reading type
89
Engine pressure ratio is the total pressure between the
  • Front of the engine inlet and the aft end of the compressor
  • Aft end of the compressor and the aft end of the turbine
  • Front of the compressor and the rear of the tubine
90
Engine vibration is monitored using
  • Piezoelectric accelerometer
  • Fenwall type sensor
  • Electromechanical devices
91
An EMF is produced by a thermocouple. This is sensed
  • At the hot junction
  • At the cold junction
  • Between the hot and the cold junction
92
EPR is
  • Pt7/Tt2
  • Pt7/Pt2
  • Tt2/Pt7
93
An EPR gauge indicates 1.You should
  • Do nothing this is what it should read with the engine shut down
  • Replace the indicator, there is no adjustment
  • Adjust the indicator back to zero
94
An EPR system reads slightly over 1, this would mean
  • The transmitter datum point has moved and needs replacing
  • The indicator need re-calibrating back to 1
  • No action required this is normal
95
Fuel flow indication is taken from
  • After the HP pump
  • After either HP pump or LP pump
  • After LP pump
96
Fuel flow is measured in
  • lbs/hr or kg/hr
  • lbs/min or kg/min
  • litres
97
An increase in fuel flow through the impeller type fuel flow transmitter is measured by
  • Drum lagging the impeller
  • Impeller lagging the drum
  • Decreasing angle between the two
98
How are EGT thermocouples connected
  • Series
  • Parallel / Series
  • Parallel
99
How are EGT thermocouples connected
  • Series
  • Parallel
  • Parallel / Series
100
An open circuit in a DC ratiometer will give
  • Off-scale reading
  • Maximum scale reading
  • Zero scale reading
101
How are the dissimilar metals in a thermocouple connected
  • By an air gap between the two metals
  • Three metals joined together
  • By welding the two metals
102
Boost pressure is
  • Atmospheric above ambient
  • The absolute of the manifold chamber
  • Atmospheric below ambient
103
How is the engine vibration information presented to the pilot
  • Proportionally
  • Decibels
  • Hertz
104
Boost pressure is a measure of
  • Atmospheric pressure less turbocharge inlet pressure
  • Atmospheric pressure plus turbocharge inlet pressure
  • Manifold pressure
105
How is the N1 and N2 measured on a triple spool engine
  • Tachometer connected to the external gearbox
  • Tachometer connected to the internal gearbox
  • Pulse type speed probes
106
Boost pressure is measured in
  • PSI
  • Inches of water
  • Inches of Hg
107
If the thermocouple leads were inadvertently crossed at installation what would the EGT gauge pointer be
  • Normal temperature for prevailing conditions
  • Moves off scale on the zero side of the meter
  • Moves off the scale on the high side of the meter
108
Calibration for a ratiometer type temperature indicator takes into account
  • The material of the sensing element
  • The material of the coils
  • The type of representation on the dial
109
If there is a restriction in the oil pressure gauge lin , the gauge will
  • Fluctuate
  • Read high
  • Read low
110
In a captive type fuel quantiity indicating system the tank units are connected in
  • Parallel
  • Series / Parallel
  • Series
111
Connection to a tachogenerator
  • 3 phase star
  • 3 phase delta
  • 2 phase star
112
In a multi-thermocouple loop, if one thermocouple goes open circuit, the indication
  • Will have no effect on temperature indication
  • Will show a decrese of 10-15C'
  • Will show an increse of 10-15C'
113
EGT thermocouples are usually made of
  • Chromel and alumel
  • Nickel and platinum
  • Chromel and platinum
114
In a ratiometer indicator, the needle deflection is a result of
  • The resultant forces from two coils deflection in a permanent magnetic field
  • The resultant forces from two coils
  • One coil deflection due to a permanent magnetic field
115
EPR is a measure of
  • Exhaust pressure compared to compressor inlet pressure
  • Exhaust pressure compared to combustor pressure
  • Combustion pressure compared to compressor inlet pressure
116
In a tachometer generator
  • Frequency output is proportional to engine speed
  • The frequency output is inversely proportional to engine speed
  • The frequency output is constant
117
EPR is measure between inlet and
  • Front of turbine
  • Jet pipe
  • Cold and hot exhaust
118
In a thermocouple system, the size of the EMF that is produced is a result of
  • The cold juntion only
  • The difference between the hot and cold junction
  • The hot junction only
119
EPR of a turbo fan engine is a ratio of
  • P4 to P1
  • P-fan to P1
  • P6 to P1
120
In a thermocouple temperature sensing system, what is the purpose of the compensating resistor
  • To corret for varying ambient temperatures at the hot junction
  • To standardise the reading for differnt engine types
  • To correct for varying ambient temperatures at the cold junction
121
From where is manifold pressure taken on a supercharged engine
  • Between the supercharger and the throttle
  • Between the carburettor and the supercharger
  • Between the carburettor and induction ports
122
In a thermocouple temperature sensing system, why are the extension leads made of the same material as the main lead
  • To prevent errors due to presence of microjunctions
  • To make installation easier
  • To prevent disiimilar metal corrosion
123
In a turbine engine, where is the turbine discharge pressure indicator sensor located
  • At the aft end of the compressor section
  • At a location in the exhaust cone that is determined to be subject to the highest pressures
  • Immediately aft of the last turbine stage
124
In addition to fuel quantity, a computerized fuel system with a totalizer indicator provides indication of how many of the following
  • Fuel flow rate, fuel used since reset or initial start up, fuel time remaining at current power setting, fuel temperature
  • Fuel flow rate, fuel used since reset or initial start up, fuel temperature
  • Fuel flow rate, fuel used since reset or initial start up, fuel time remaining at current power setting
125
Gas type fire wires operate by utilizing
  • The change in the gas dielectric level
  • The change in gas pressure
  • The change in the electrical resistance of the gas
126
How are the dissimilar metals in a thermocouple connected
  • By welding the two metals
  • By an air gap between the two metals
  • Three metals joined together
127
In what units are gas turbine engine tachometers calibrated
  • Percent of engine RPM
  • Actual engine RPM
  • Percent of engine pressure ratio
128
Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type
  • Vane with calibrated spring
  • Bourdon tube
  • Diaphragm or bellows
129
How does a boost gauge compenstae for altitude changes
  • There is no compensation
  • Spring sealed bellows
  • Two bellows against atmospheric pressure
130
How is manifold boost pressure measured
  • By two bellows in tandem
  • By a single direct pressure with one capsule
  • By a differential measuring system
131
Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type
  • Bourdon tube
  • Diaphragm or bellows
  • Vane with calibrated spring
132
Integrating fuel flow gives
  • Total fuel consumed
  • Fuel flow and acceleration
  • Average fuel flow
133
How is power indicated on a fixed pitch propeller
  • Torque gauge
  • RPM gauge
  • Horsepower gauge
134
How is the N1 and N2 measured on a triple spool engine
  • Tachometer connected to external gearbox
  • Pulse type speed probes
  • Tachometer connected to internal gearbox
135
Modern oil pressure servo transmitters sense
  • Differential pressure
  • Absolute pressure
  • HP oil pressure
136
Motor driven impeller and turbine fuel flow transmitters are designed to transmit data
  • Using aircraft electrical system power
  • Mechanically
  • By fuel pressure
137
If a tacho generator indicated in reverse, the probable cause is
  • Supply and transmitter cross connected
  • Two phases cross connected
  • Worng input frquency
138
In a thermocouple system, one thermocouple goes open circuit. What error is detected at the indicator
  • No indication
  • Guage freezes at last known reading
  • None
139
N2 is taken from
  • A tachometer on the accessory gear box
  • A tachometer attatched on the N1 gearbox
  • A speed transducer on the fan rear frame
140
Oil temperature thermocouples are usually constructed of
  • Chromel alumel
  • Iron constantan
  • Alumel Constantan
141
In a dive, with the throttes fixed, EPR will
  • Decrease
  • Increase
  • Not change
142
In a gas turbine, if air is tapped from the HP bleed
  • EPR stays constant and EGT decreases
  • EPR decreases and EGT increases
  • EPR increases and EGT decreases
143
On an aircraft turbine engine, operating at a constant power, the application of engine anti-icing will result in
  • Noticeable shift in EPR
  • An increase in EPR
  • A false EPR reading
144
On an EGT thermocouple system, the hot junction
  • Is placed up stream of the combustion chamber
  • Is placed in cockpit
  • Is placed downstream of the combustion chamber
145
In a motor drived fuel flow type meter, the pick off coils
  • Are perfectly aligned
  • Have a slight angular difference
  • Are perpendicular to each other
146
In a multiple probe thermocouple system, what is the effect if one probe fails
  • No noticeable effect
  • Increase in temperature reading
  • Reduction in temperature reading
147
On an RPM system using a synchronous generator, the point is deflected by
  • A wheatstone bridge
  • An AC servometer
  • A potentiometer
148
Regarding an engine EGT detection system, which of the following statements is true
  • Alumel can be either positive or negative depending on the application
  • Alumel is positive and chromel negative
  • Chromel is positive and alumel negative
149
In a ratiometer indicator, the needle deflection is a result of
  • The resultant forces from two coils
  • The resultant forces from two coil deflection in a permanent magnetic field
  • One coil deflection due to a permanent magnetic field
150
In a temperature sensing ratiometer what determines the actual temperature
  • The material of the sensing coil
  • The material of the balancing coil
  • The material of the sensor
151
Some types of oil temperature indication systems utilise
  • A strain gauge
  • A wheatsone bridge / ratiometer
  • A synchronous motor
152
The compensation device on an EGT system must be re-calibrated after
  • Manufacture and overhaul
  • Does not need calibration
  • Each time a part of the system is replaced
153
In a thermocouple circuit on a non FADEC engine, what is the purpose of the ballast resistor
  • To compensate for ambient temperature
  • To compensate for altitude
  • To standardise both engines EGT readings
154
In a thermocoupe temperature sensing system, what is the purpose of the compensating resistor
  • To standardise the reading for different engine types
  • To correct for varying ambient temperatures at the cold junction
  • To correct fop varying ambient temperatures at the hot junction
155
The drag cup in a tachogenerator is balanced by
  • Adjustment screw
  • Calibrated hairspring
  • Adjustable counterbalance weights
156
The exhaust gas temperature indicator on a gas turbine engine provides a relative indication of the
  • Temperature of the exhaust gases as they pass the exhaust cone
  • Exhaust temperature
  • Turbine inlet temperature
157
In a thermocouple temperature sensing system, why are extension leads made of the same material as the main lead
  • To prevent errors due to presence of microjunctions
  • To make installation easier
  • To prevent dissimilar metal corrosion
158
Integrated fuel flow gives
  • Average fuel flow
  • Total fuel consumed
  • Fuel flow and acceleration
159
The fuel flow indication data sent from motor driven impeller and turbine, and motorless type fuel flow transmitters is a measure of
  • Fuel flow volume
  • Engine burner pressure drop
  • Fuel flow mass
160
The fuel flow indicator rotor and needle for a motor impeller and turbine indicating system is driven by
  • An electrical signal
  • A mechanical gear trim
  • Direct coupling to the motor shaft
161
Leads to measure thermocouple temperature are
  • Calibrated for the circuit in use and cannot be shortened
  • Insulated by heat lagging device to reduce errors in the indication end
  • Affected by magnetic and electrical interference
162
Manifold prssure is measured
  • At inlet port above and below ambient
  • At inlet port indicating boost pressure
  • At inlet port above and below standard atmosphere at sea level
163
The gauge on a bulb type temperature indicator shows zero. This could be caused by
  • Open circuit in the wiring
  • Two cables shorting together by the sensor
  • Temperature bulb going open circuit
164
The indication on a thermocouple type EGT indicator is produced by
  • Resistance changes in two dissimilar metals
  • A difference in voltage between two dissimilar metals
  • A current generated by the temperature difference between dissimilar metal hot and cold junctions
165
Manifold pressure is measured in
  • Differential pressure in millibar
  • Direct absolute pressure in bar
  • Direct absolute pressure in Inch of Hg
166
No power to EGT is indicated by
  • Yellow flag in front counter
  • Bug moves in the X direction
  • Bug moves in the Y direction
167
The indicator of a tachometer system is responsive to change in
  • Frequency
  • Current flow
  • Voltage
168
The principle behind the working of ratiometer circuit is that
  • There is no current induced in the circuit
  • The current induced in the two coils balances of each other in presence of a permanent magnetic field
  • The current induced in the two coil balances ech other
169
The resistance of a temperature bulb
  • Decreases with an increase in temperature
  • Increases with an increase in temperature
  • Remians constant regardless of temperature
170
Oil quantity is transmitted to the EICAS by
  • A reed switch ladder activated by a magnetic float in oil tank
  • A belt type capacitor system
  • A float switch in the oil tank
171
On a fixed pitch propeller single engine aircraft, what is indicated as a measure of power
  • Engine speed
  • Cylinder head temperature
  • Oil pressure
172
The RPM indication of a synchronous AC motor tachometer is governed by the generator
  • Voltage
  • Frequency
  • Current
173
Thermocouple leads
  • May be installed with either lead to either post of indicator
  • May be repaired using solderless connectors
  • Are designed for a specific installation and may not be altered
174
On a fuel flow measuring device located on the engine
  • No adjustment can be made
  • External adjustment can be made for minimum rate fuel flow
  • External adjustment can be made for maximum rate fuel flow
175
On a large engine EGT system, when a thermocouple fails, the temperature reading will
  • Under read
  • Stay the same
  • Over read
176
Thermocouple metals most commonly used are
  • Constantan and copper
  • Austenitic stainless steel and copper
  • Titanium and copper
177
Thrust in a high bypass engine
  • Is indicated by measuring fuel flow
  • Is indicated by measuring N3 RPM
  • Is not indicated in flight
178
Piezoelectric transducers convert
  • A tensile stress into a current output
  • A pressure input into a resistance output
  • A force input into a voltage output
179
Propeller speeed is measured from
  • A tachometer on the LP turbine shaft
  • A pulse probe at the engine side of the reduction gear
  • A slip ring pulse probe
180
Thrust in a high by pass fan engine is idicated by
  • N3 RPM or P1/P4 ratio
  • N1 RPM or N3 RPM
  • N1 RPM or EPR
181
Torque measurement in a gas turbine engine is
  • Not always reliable
  • Required only when the turbine drives a propeller
  • Higly reliable
182
Propeller torque is analogue to
  • Propeller RPM
  • Engine RPM
  • Shaft horsepower
183
Pure jet engine use
  • Variable resistance thermocouples
  • Rapid response themocouples
  • Stagnation thermocouples
184
Torque pressure is usually read from a
  • Tension gauge
  • Direct reading pressure gauge
  • Torque meter
185
Ratiometer pointer movement is achieved by
  • Two opposing coils providing a torque in a uniform permanent magnetic field
  • Two opposing coils providing a torque in a non-uniform permanent magnetic field
  • One coil providing a torque against a permanent magnet
186
Regarding an engine EGT detection system, which of the following statements is true
  • Alumel is positive and chromel negative
  • Chromel is postive and alumel is negative
  • Alumel can be either positive or negative depending on the application
187
Vibration pick-ups are located
  • On the fan/compressor case
  • On the turbine case
  • On both the fan and turbine cases
188
Vibration signals, when picked up,
  • Go through half wave rectifier to indicator
  • The frequencies are filtered to exclude unwanted frequencies
  • Go straight to indicator
189
Relative permittivity of fuel is also known as
  • Dielectric constant of the fuel
  • Density of the fuel
  • Weight of the fuel
190
Strain gauges may be used to measure
  • RPM
  • Thrust
  • Torque
191
What happens when bulb type thermometer resistive element goes open circuit
  • No reading given
  • Reads more than ambient
  • Reads less than ambient
192
The EMF generated by a thermocouple is dependent upon the
  • Temperature difference between hot junction and the cold junction
  • Temperature of the twometals at the cold junction only
  • Temperature of the twometals at the hot junction only
193
Th EPR reading is taken from a ratio of
  • Turbine inlet pressure to compressor delivery presure
  • Jet pipe pressure to compressor inlet pressure
  • Compressor delivery pressure to compressor inlet pressure
194
The optimum turbine speed is defined as
  • The most efficient speed of the turbine
  • 100% RPM of the engine
  • 95% RPM of the engine
195
What is the Engine Pressure Ratio used for
  • To indicate the thrust produced by the engine
  • As a cross check for minimum acceptable thrust
  • To limit the maimum exhaust gas temperature
196
What is the Engine Pressure Ratio used to indcate
  • As a cross check for minimum acceptable thrust
  • The thrust produced by the engine
  • The power produced by the negine
197
The physial law used for calibrating a thermocouple indicator depends on
  • The range that the meter is require to read- i.e. Operating scale
  • The materials of the coils in the meter
  • The materials of the sensing element
198
The principle of operation of a DC ratiometer is
  • One coil moving in a uniform magnetic field
  • Two coils moving in a uniform magnetic field
  • Two coils moving in a non-uniform magnetic field
199
What is the primary purpose of the tachometer on an axial compressor turbine stage
  • Monitor engine RPM during cruise conditions
  • Monitor engine RPM during starting to indicate overspeed conditions
  • It is the most accurate instrument for establishing thrust settings under all conditions
200
The starter light is on during a start cycle (Low voltage electrical starter)
  • If the light stays on after 30 seconds action is required
  • Indicates electrical power is flowing to the starter
  • This is normal for 30 seconds, take no action
201
The tacho generator output has
  • A fixed frequency
  • A variable frequency
  • DC output
202
The term 'Mass Flow Rate' means
  • Total mass of air divided by time
  • Total volume of air multiplied relative density
  • Total volume multiplied by velocity airflow
203
The test switch of a continuous loop fire detector gives a
  • Bonding check
  • Insulation check
  • Continuity check
204
The total power in a turboprop engine is the
  • BHP
  • ESHP
  • SHP
205
The vane in a vane type fuel flow measuring device becomes stuck. What safety backup is available for the engine flow
  • A bypass valve
  • A differential pressure bypass valve
  • A fuel bleed valve
206
Thrust in a high bypass engine is measured by measuring
  • Fuel flow
  • Neither the N3 RPM or fuel flow, thrust is not indicated in flight
  • N3 RPM
207
Thrust in a high bypass fan engine is indicated by
  • N1 RPM or EPR
  • N1 RPM or N3 RPM
  • N3 RPM or P1/P4 ratio
208
To check/test a temperature indicator you would
  • Connect a decade box in series with the temperature sensing element
  • Connect a decade box in parallel with the temperature sensing element
  • Connect a decade box in place of the temperature sensing element
209
To measure oil temperature, which of the following would most likely be used
  • Resistance temperature measurement
  • Optical pyrometer
  • Thermocouple measurement
210
Torque is a useful measure
  • On engines where a portion of thrust produces torque
  • On all engines
  • On engine which only produce thrust
211
Torque is measured in gas turbine engines
  • Where there is a free turbine providing the power
  • On small pure jet engines
  • Never
212
Torque measurement is taken from
  • Reduction gearbox
  • Prop shaft
  • Free turbine shaft
213
Torque pressure indication to measure power output of an engine is
  • Used in all gas turbine engines
  • Not used in gas turbine engines
  • Only used when engine output power is used for torque not for thrust
214
Transient torque along an engine shaft caused by the aircraft electrical system can be damped by
  • Installing a clutch damper
  • Connecting using a shear shaft
  • A damping circuit built in to aircraft G.C.U
215
Turboprop thermocouple probes are
  • Rapid response
  • Surface mounted
  • Stagnation
216
Typically a torque pressure indication system is
  • Remote synchronous type
  • Differential pressure type
  • Direct oil pressure sensing type
217
Vibration analysers determine which compnents is vibrating by analysing
  • Amplitude
  • Voltage
  • Frequency
218
What are the types of continuous fire detection system
  • Capcitive and resistive
  • Inductive and capactive
  • Capacitive
219
What are the units of manifold pressure on a normally aspirated engine
  • Inches of mercury
  • Inches of water
  • PSI
220
What exactly does a thermocople measure
  • The difference between the hot and cold junction
  • Hot junction temperature
  • Cold junction temperature
221
What indication does the pilot receive that thrust reversers have deployed
  • An audible warning
  • A feeling of rapid deceleration
  • A sequence of lights
222
What is EPR
  • Reduction of Jet pipe to compressor pressure
  • Ratio of Jet pipe to inlet pressures
  • Ratio of compressor to inlet pressures
223
What is the supply voltage to tacho generators
  • It has no supply
  • 115V AC
  • 28V DC
224
What is unit of measurement for vibration
  • Decibel
  • Frekans
  • Relative amplitude
225
What power supply is required for a thermocouple system to work
  • Alternating current
  • Neither of these
  • Direct currrent
226
What will happen if the forward speed is increased and the thrust levers remain stationary
  • No effect on EPR
  • EPR decreases
  • EPR increases
227
What would you use to test a thermocouple system
  • A calibrated heat
  • 115V Supply
  • A servicable battery
228
When an EGT harness goes through a bulkhead disconnect you must ensure that
  • The pins etc should be silver soldered and their connections properly made
  • Pins and sockets must be correctly crimped or braised and tested using 250V megger
  • Pins and sockets are of the same material as the thermocouple leads
229
When terminating connections for a EGT sensing system
  • Ensure that the pins and sockets are correctly crimped and braised
  • Pins and sockets are of the same material as the leads
  • Ensure all the connections are silver soldered
230
When using a test set to test an EGT thermocouple circuit
  • No compensation for ambient temperature is required
  • Always compensate for ambient temperature
  • Only consider ambient temperature compensation if the ambient temperature is over 20'
231
When using an engine protection and control unit test set, the speed limit is tested
  • By increasing the engine speed above normal datum
  • By increasing the engine temperature
  • Lower than the normal datum
232
Where is EGT measured
  • Upstream of the combusation chamber
  • Downstream of the combustion chamber
  • In the combustion chamber
233
Where is the hot junction of a EGT thermocouple system found
  • In the indicator
  • Downstream of the combustion chamber
  • Upstream of the combustion chamber
234
Which statement is true about engine trend monitoring
  • It shows the pilot the trends for engine performance
  • It analyses engine data on the ground to detect engine parameters that indicates a trend towards limit
  • It only analyses engine data in order to show when the engine has to be overhauled
235
With an aircraft with a fixed pitch propeller, what indication has the pilot got of the output power
  • Fuel flow
  • Engine speed indicatior
  • Oil pressure
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