1A turbo-prop engines torque meter measures the
- Bow of the shaft
- Speed of the shaft
- Twist of the shaft
2In 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%
3The tacho-indicator magnet is driven by
- An induction motor
- A DC motor
- A synchronous motor
4A 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
5The tacho-indicator is driven by
- An induction motor
- A DC motor
- A synchronous motor
6A boost gauge measures
- Gauge pressure at the injector
- Absolute pressure on the inlet port
- Brake mean effective pressure
7In 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
8A 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
9A 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
10In an EGT system, cold junction temperature compensation for the instrument moving coil is achieved by a
- Bimetal spring
- Thermistor
- Resistor
11In an EGT system, cold junction temperature compensation for the instrument moving coil is achieved by a
- Resistor
- Bimetal spring
- Thermistor
12A tachogenerator indicator takes its reading from
- Eddys in the drag cup
- A fixed frquency
- Variable frequencies depending on the rotor speed
13The speed of the motor in the tacho-indicator depends on
14An 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
15A broadband vibration reading indicates
- The average vibration
- The peak allowable vibration
- The N1 vibration
16The speed of the motor in the tacho-indicator depends on
- Frequency
- Current
- Voltage
17An 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
18A Bourbon tube instrument may be used to indicate
- Position and quantity
- Pressure, temperature, position and quantity
- Pressure and temperature
19What 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
20The 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
21An EGT system normally indicates in
22An EPR system uses the pressure ratio of
- Inlet / Outlet
- Outlet / Inlet
- Outlet / Inlet-outlet
23An EGT system normally indicates in
24A CIT sensor is made up of
- Iron-constantan
- Platinum-rhodium
- Chromel-alumel
25An EPR system uses the pressure ratio of
- Inlet / Outlet
- Outlet / Inlet-outlet
- Outlet / Inlet
26A 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
27The 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
28On 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
29A common type of electrically operated oil temperature gauge utilizes
- Either a wheatstone bridge or ratiometer
- Vapour pressure and pressure switches
- A thermocouple type circuit
30A 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
31A rapid response type thermocouple is fitted to a
- Turbo-prop engine
- Piston engine
- Turbojet engine
32A rapid response type thermocouple is fitted to a
- Piston engine
- Turbo-prop
- Turbojet
33Manifold pressure is measured in
34In 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
35What 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
36A sensing element goes open circuit in a ratiometer. What will happen
- Full scale deflection
- Hairspring takes indicator off scale
- Temperature indicates below ambient
37A 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
38In 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
39A short circuit in a DC ratiometer will give
- Maximum scale reading
- Zero scale reading
- Minimum scale reading
40On 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
41The filter used in an accelerometer type vibration system is a
- Band pass
- High pass
- Low pass
42The supply to an AC ratiometer instrument is
- 115V 3 phase 400Hz AC
- Single-phase AC
- 28 Volts DC
43When 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
44The supply to an AC ratiometer instrument is
- 28 Volts DC
- Single-phase AC
- 115V 3 phase 400Hz AC
45An 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
46A thermocouple is made up of
- 3 dissimilar metals welded together
- 2 dissimilar metals with an air gap between them
- 2 dissimilar metals welded together
47A thermocouple is made up of
- 3 dissimilar metals welded together
- 2 dissimilar metals with an air gap between them
- 2 dissimilar metals welded together
48The filter used in an accelerometer type vibration system is a
- Band pass
- High pass
- Low pass
49A tachogenerator, to indicate revs/min, requires
- 28V DC aircraft electrical system
- 115V AC from aircraft electrical system
- No power supply
50When 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
51An 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
52A ratiometer type indicator has
- One coil, a non linear air gap
- Two coils, a linear air gap
- A non-linear air gap, two coils
53A 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
54A tachogenerator output is
- Three phase AC
- DC
- Single-phase AC
55A synchro pressure measuring system requires
- Direct current
- Either AC or DC
- Alternating current
56A tachogenerator engine speed indication system requires
- 115 volts AC
- 28 volts DC
- No external power
57In 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
58A ratiometer type indicator has
- Two coils, a linear air gap
- A non-linear air gap, two coils
- One coil, a non linear air gap
59A synchro prssure measuring system works on the principle of changes in pressure related changes in
60A 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
61A tachogenerator output is
- Single-phase AC
- DC
- Three-phase AC
62To read oil pressure direct from the source, you would use
- A sensitive capsule
- A bourdon tube
- An electrical transmitter
63A thermocouple indicator is basically a
- Millameter
- Millivoltmeter
- Milliohmeter
64A tacho pointer is moved by
- An AC servo motor
- A drag cup coupling
- A synchronous motor
65100% 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
66In 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
67A thermocouple indicator is connected to the
- Hot junction
- Cold junction
- Difference between the hot junction and the cold junction
68To read oil pressure direct from the source, you would use
- A sensitive capsule
- A bourdon tube
- An electrical transmitter
69A pulse probe system uses
- Variable reluctance to produce an output
- Variable resistance to produce an output
- Variable inductance to produce an output
70In 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
71A typical torquemeter is
- Direct reading type
- A synchornous motor type
- A differential pressure type
72With the engine stopped on the ground, a manifold pressure gauge would read
- One
- Airfield pressure
- Zero
73In 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
74A pulse probe system uses
- Variable inductance to produce an output
- Variable reluctance to produce an output
- Variable resistance to produce an output
75A tachogenerator used to measure rev/miin in turbine engines
- 115V AC is required
- 28V DC is required
- Develops its own power for the system
76An AC type of tachometer
- Needs input DC voltage
- Needs input AC voltage
- Needs no electrical power
77A 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
78A thermocouple indication is taken from the
- Difference between the hot junction and the cold junction
- Hot junction
- Cold junction
79An aircraft fuel flow meter normally indicates
- Rates of fuel consumption
- Velocity of the fuel
- Rate of refuelling the aircraft
80A thermocouple indicator is basically a
- Milliameter
- Millivoltmeter
- Milliohmeter
82EGT thermocouples are usually made of
- Chromel and platinum
- Chromel and alumel
- Nickel and platinum
83A thermocouple is constructed of
- Three dissimilar metals welded together
- Two dissimilar metals welded together
- Two dissimilar metals withan air gap between them
84A thermocouple sensing system test set requires
- No power
- A serviceable battery
- 24V DC
85An 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
87A torque pressure measuring indicator is fed with
- Servo operated
- Differential pneumatic pressure
- Direct oil pressure
88A typical torqumeter is
- A differential pressure type
- A synochronous motor type
- Direct reading type
89Engine 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
90Engine vibration is monitored using
- Piezoelectric accelerometer
- Fenwall type sensor
- Electromechanical devices
91An EMF is produced by a thermocouple. This is sensed
- At the hot junction
- At the cold junction
- Between the hot and the cold junction
93An 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
94An 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
95Fuel flow indication is taken from
- After the HP pump
- After either HP pump or LP pump
- After LP pump
96Fuel flow is measured in
- lbs/hr or kg/hr
- lbs/min or kg/min
- litres
97An 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
98How are EGT thermocouples connected
- Series
- Parallel / Series
- Parallel
99How are EGT thermocouples connected
- Series
- Parallel
- Parallel / Series
100An open circuit in a DC ratiometer will give
- Off-scale reading
- Maximum scale reading
- Zero scale reading
101How 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
102Boost pressure is
- Atmospheric above ambient
- The absolute of the manifold chamber
- Atmospheric below ambient
103How is the engine vibration information presented to the pilot
- Proportionally
- Decibels
- Hertz
104Boost pressure is a measure of
- Atmospheric pressure less turbocharge inlet pressure
- Atmospheric pressure plus turbocharge inlet pressure
- Manifold pressure
105How 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
106Boost pressure is measured in
- PSI
- Inches of water
- Inches of Hg
107If 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
108Calibration 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
109If there is a restriction in the oil pressure gauge lin , the gauge will
- Fluctuate
- Read high
- Read low
110In a captive type fuel quantiity indicating system the tank units are connected in
- Parallel
- Series / Parallel
- Series
111Connection to a tachogenerator
- 3 phase star
- 3 phase delta
- 2 phase star
112In 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'
113EGT thermocouples are usually made of
- Chromel and alumel
- Nickel and platinum
- Chromel and platinum
114In 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
115EPR is a measure of
- Exhaust pressure compared to compressor inlet pressure
- Exhaust pressure compared to combustor pressure
- Combustion pressure compared to compressor inlet pressure
116In a tachometer generator
- Frequency output is proportional to engine speed
- The frequency output is inversely proportional to engine speed
- The frequency output is constant
117EPR is measure between inlet and
- Front of turbine
- Jet pipe
- Cold and hot exhaust
118In 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
119EPR of a turbo fan engine is a ratio of
- P4 to P1
- P-fan to P1
- P6 to P1
120In 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
121From 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
122In 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
123In 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
124In 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
125Gas 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
126How 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
127In what units are gas turbine engine tachometers calibrated
- Percent of engine RPM
- Actual engine RPM
- Percent of engine pressure ratio
128Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type
- Vane with calibrated spring
- Bourdon tube
- Diaphragm or bellows
129How does a boost gauge compenstae for altitude changes
- There is no compensation
- Spring sealed bellows
- Two bellows against atmospheric pressure
130How is manifold boost pressure measured
- By two bellows in tandem
- By a single direct pressure with one capsule
- By a differential measuring system
131Instruments 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
132Integrating fuel flow gives
- Total fuel consumed
- Fuel flow and acceleration
- Average fuel flow
133How is power indicated on a fixed pitch propeller
- Torque gauge
- RPM gauge
- Horsepower gauge
134How 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
135Modern oil pressure servo transmitters sense
- Differential pressure
- Absolute pressure
- HP oil pressure
136Motor driven impeller and turbine fuel flow transmitters are designed to transmit data
- Using aircraft electrical system power
- Mechanically
- By fuel pressure
137If a tacho generator indicated in reverse, the probable cause is
- Supply and transmitter cross connected
- Two phases cross connected
- Worng input frquency
138In a thermocouple system, one thermocouple goes open circuit. What error is detected at the indicator
- No indication
- Guage freezes at last known reading
- None
139N2 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
140Oil temperature thermocouples are usually constructed of
- Chromel alumel
- Iron constantan
- Alumel Constantan
141In a dive, with the throttes fixed, EPR will
- Decrease
- Increase
- Not change
142In 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
143On 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
144On 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
145In a motor drived fuel flow type meter, the pick off coils
- Are perfectly aligned
- Have a slight angular difference
- Are perpendicular to each other
146In a multiple probe thermocouple system, what is the effect if one probe fails
- No noticeable effect
- Increase in temperature reading
- Reduction in temperature reading
147On an RPM system using a synchronous generator, the point is deflected by
- A wheatstone bridge
- An AC servometer
- A potentiometer
148Regarding 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
149In 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
150In 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
151Some types of oil temperature indication systems utilise
- A strain gauge
- A wheatsone bridge / ratiometer
- A synchronous motor
152The 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
153In 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
154In 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
155The drag cup in a tachogenerator is balanced by
- Adjustment screw
- Calibrated hairspring
- Adjustable counterbalance weights
156The 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
157In 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
158Integrated fuel flow gives
- Average fuel flow
- Total fuel consumed
- Fuel flow and acceleration
159The 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
160The 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
161Leads 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
162Manifold 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
163The 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
164The 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
165Manifold pressure is measured in
- Differential pressure in millibar
- Direct absolute pressure in bar
- Direct absolute pressure in Inch of Hg
166No power to EGT is indicated by
- Yellow flag in front counter
- Bug moves in the X direction
- Bug moves in the Y direction
167The indicator of a tachometer system is responsive to change in
- Frequency
- Current flow
- Voltage
168The 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
169The resistance of a temperature bulb
- Decreases with an increase in temperature
- Increases with an increase in temperature
- Remians constant regardless of temperature
170Oil 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
171On a fixed pitch propeller single engine aircraft, what is indicated as a measure of power
- Engine speed
- Cylinder head temperature
- Oil pressure
172The RPM indication of a synchronous AC motor tachometer is governed by the generator
- Voltage
- Frequency
- Current
173Thermocouple 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
174On 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
175On a large engine EGT system, when a thermocouple fails, the temperature reading will
- Under read
- Stay the same
- Over read
176Thermocouple metals most commonly used are
- Constantan and copper
- Austenitic stainless steel and copper
- Titanium and copper
177Thrust in a high bypass engine
- Is indicated by measuring fuel flow
- Is indicated by measuring N3 RPM
- Is not indicated in flight
178Piezoelectric transducers convert
- A tensile stress into a current output
- A pressure input into a resistance output
- A force input into a voltage output
179Propeller 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
180Thrust 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
181Torque measurement in a gas turbine engine is
- Not always reliable
- Required only when the turbine drives a propeller
- Higly reliable
182Propeller torque is analogue to
- Propeller RPM
- Engine RPM
- Shaft horsepower
183Pure jet engine use
- Variable resistance thermocouples
- Rapid response themocouples
- Stagnation thermocouples
184Torque pressure is usually read from a
- Tension gauge
- Direct reading pressure gauge
- Torque meter
185Ratiometer 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
186Regarding 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
187Vibration pick-ups are located
- On the fan/compressor case
- On the turbine case
- On both the fan and turbine cases
188Vibration signals, when picked up,
- Go through half wave rectifier to indicator
- The frequencies are filtered to exclude unwanted frequencies
- Go straight to indicator
189Relative permittivity of fuel is also known as
- Dielectric constant of the fuel
- Density of the fuel
- Weight of the fuel
190Strain gauges may be used to measure
191What happens when bulb type thermometer resistive element goes open circuit
- No reading given
- Reads more than ambient
- Reads less than ambient
192The 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
193Th 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
194The optimum turbine speed is defined as
- The most efficient speed of the turbine
- 100% RPM of the engine
- 95% RPM of the engine
195What 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
196What 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
197The 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
198The 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
199What 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
200The 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
201The tacho generator output has
- A fixed frequency
- A variable frequency
- DC output
202The 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
203The test switch of a continuous loop fire detector gives a
- Bonding check
- Insulation check
- Continuity check
204The total power in a turboprop engine is the
205The 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
206Thrust 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
207Thrust in a high bypass fan engine is indicated by
- N1 RPM or EPR
- N1 RPM or N3 RPM
- N3 RPM or P1/P4 ratio
208To 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
209To measure oil temperature, which of the following would most likely be used
- Resistance temperature measurement
- Optical pyrometer
- Thermocouple measurement
210Torque is a useful measure
- On engines where a portion of thrust produces torque
- On all engines
- On engine which only produce thrust
211Torque is measured in gas turbine engines
- Where there is a free turbine providing the power
- On small pure jet engines
- Never
212Torque measurement is taken from
- Reduction gearbox
- Prop shaft
- Free turbine shaft
213Torque 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
214Transient 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
215Turboprop thermocouple probes are
- Rapid response
- Surface mounted
- Stagnation
216Typically a torque pressure indication system is
- Remote synchronous type
- Differential pressure type
- Direct oil pressure sensing type
217Vibration analysers determine which compnents is vibrating by analysing
- Amplitude
- Voltage
- Frequency
218What are the types of continuous fire detection system
- Capcitive and resistive
- Inductive and capactive
- Capacitive
219What are the units of manifold pressure on a normally aspirated engine
- Inches of mercury
- Inches of water
- PSI
220What exactly does a thermocople measure
- The difference between the hot and cold junction
- Hot junction temperature
- Cold junction temperature
221What indication does the pilot receive that thrust reversers have deployed
- An audible warning
- A feeling of rapid deceleration
- A sequence of lights
222What is EPR
- Reduction of Jet pipe to compressor pressure
- Ratio of Jet pipe to inlet pressures
- Ratio of compressor to inlet pressures
223What is the supply voltage to tacho generators
- It has no supply
- 115V AC
- 28V DC
224What is unit of measurement for vibration
- Decibel
- Frekans
- Relative amplitude
225What power supply is required for a thermocouple system to work
- Alternating current
- Neither of these
- Direct currrent
226What will happen if the forward speed is increased and the thrust levers remain stationary
- No effect on EPR
- EPR decreases
- EPR increases
227What would you use to test a thermocouple system
- A calibrated heat
- 115V Supply
- A servicable battery
228When 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
229When 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
230When 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'
231When 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
232Where is EGT measured
- Upstream of the combusation chamber
- Downstream of the combustion chamber
- In the combustion chamber
233Where is the hot junction of a EGT thermocouple system found
- In the indicator
- Downstream of the combustion chamber
- Upstream of the combustion chamber
234Which 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
235With an aircraft with a fixed pitch propeller, what indication has the pilot got of the output power
- Fuel flow
- Engine speed indicatior
- Oil pressure