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CPL Test Series
Question Bank
Questions for PRESSURE FUEL AND TEMPERATURE GAUGE( 1428-1487)
Answer the following questions
Test Mode
Training Mode
1.
The main advantage of a ratiometer-type temperature indicator is that it
is very accurate.
is simple.
carries out an independent measurement of the supply voltage.
can operate without an electrical power supply.
2.
Different pressure sensors are used according to the intensity of the pressure measured (low, medium or high)Classify the following sensors by order of increasing pressure for which they are suitable :1- bellows type2- Bourdon tube type3- aneroid capsule type
1,2,3
3,2,1
3,1,2
2,1,3
3.
In order to measure temperature the cylinder head temperature (CHT) gauge utilises a
ratiometer circuit.
bourdon tube.
a) thermocouple consisting of two dissimilar metals.
wheatstone bridge circuit.
4.
The red pointer which is normally on the red line on the EGT (Exhaust Gas Temperature) indicators
shows the vibration level of the engine under consideration.
allows the display of the parameter value to be adopted during take-off.
shows the limit value not to be exceeded.
moves when the corresponding value is exceeded and remains positioned at the maximum value that has been reached.
5.
The pressure probe used to measure the pressure of a low pressure fuel pump is
a differential capsule.
a Bourdon tube.
a bellows sensor.
an aneroid capsule.
6.
Given :M is the Mach numberTs is the static temperatureTt is the total temperature
Ts = Tt.(0.2. M²)
Ts = Tt.(1+0.2. M²)
Ts = Tt/( 0.2 M²)
Ts = Tt /(1+0.2. M²)
7.
The static air temperature (SAT) is
a relative temperature expressed in degrees Kelvin
an absolute temperature expressed in degrees Celsius
a differential temperature expressed in degrees Kelvin
a relative temperature expressed in degrees Celsius
8.
The operating principle of Flowmeters, or ""unit flow meters,"" the most commonly used at the present time, is to measure across their system the
pressure and temperature of the fuel
volumetric mass and di-electric resistance of the fuel
quantity of fuel movement
volume and viscosity of the fuel
9.
A millivoltmeter measuring the electromotive force between the ""hot junction"" and the ""cold junction"" of a thermocouple can be directly graduated in temperature values provided that the temperature of the
cold junction is maintained at 15 °C.
hot junction is maintained at 15 °C.
cold junction is maintained constant.
hot junction is maintained constant.
10.
The electronic tachometer sensor is composed of
a notched wheel rotating in front of an electro-magnet.
the rotor of a three-phase A.C. generator.
the rotor of a single phase A.C. generator.
a circular magnet with four poles.
11.
The advantages of single-phase A.C. generator tachometer are:1- the suppression of spurious signals due to a D.C. generator commutator2- the importance of line resistance on the information value3- the independence of the information in relation to the airborne electrical power supply4- the ease of transmission of the informationThe combination regrouping all the correct statements is
2, 3, 4.
1, 2, 3, 4.
2, 4.
1, 3.
12.
The principle of capacity gauges is based on the
capacitance variation of a given capacitor with the type of dielectric.
flow rate and torque variation occurring in a supply line.
capacitance variation by the volume measurement carried out on the sensor.
current variation in the Wheatstone bridge.
13.
When compared with the volumetric fuel flowmeter, the mass fuel flowmeter takes into account the fuel
density.
temperature.
pressure.
dielectrical constant.
14.
The disadvantage of an electronic rpm indicator is the
high influence of line resistance on the indication.
generation of spurious signals at the commutator.
necessity of providing a power supply source.
influence of temperature on the indication.
15.
The advantages of an electrical induction tachometer are:1- the display is not sensitive to line resistance2- the measurement is independent of aircraft power supply3- the measurement is independent of temperature variations4- the option to use without restriction several indicators connected in parallel to a single transmitterThe combination regrouping all the correct statements is
1, 2, 4.
2, 3, 4.
1, 3, 4.
1, 2, 3, 4.
16.
The electromotive force of a thermocouple is not modified if one or several intermediate metals are inserted in the circuit provided that
these metals are maintained at a temperature lower than that of the cold source.
these metals are maintained at a temperature higher than that of the cold source.
contact points are maintained at equal temperature between these different metals.
these metals are not the same as those constituting the thermocouple.
17.
Torque can be determined by measuring the
phase difference between 2 impulse tachometers attached to a transmission shaft.
quantity of light passing through a rack-wheel attached to a transmission shaft.
oil pressure at the fixed crown of an epicycloidal reducer of the main engine gearbox.
frequency of an impulse tachometer attached to a transmission shaft.
18.
The total air temperature (TAT) is always
higher than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).
higher than Static Air Temperature (SAT) depending on the altitude.
lower than Static Air Temperature (SAT) depending on the altitude.
higher lower than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).
19.
The gauge indicating the quantity of fuel measured by a capacity gauging system can be graduated directly in weight units because the dielectric constant of fuel is
the same as that of air and varies directly with density.
twice that of air and varies directly with density.
twice that of air and varies inversely with density
the same as that of air and varies inversely with density.
20.
The float type fuel gauges provide information on
mass whose indication varies with the temperature of the fuel.
volume whose indication varies with the temperature of the fuel.
mass whose indication is independent of the temperature of the fuel.
volume whose indication is independent of the temperature of the fuel.
21.
The operating principle of an ""electronic"" tachometer is to measure the
electromotive force (EMF) produced by a dynamo or an alternator.
rotation speed of an asynchronous motor energized by an alternator.
frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
magnetic field produced by a dynamo or an alternator.
22.
The basic principle used for measuring a quantity of fuel in a transport airplane equipped with ""capacitor"" gauges is that the
electromotive force of a capacity depends on the nature of the dielectric in which it is immersed.
capacity of a capacitor depends on the distance between its plates.
capacity of a capacitor depends on the nature of the dielectric in which it isimmersed.
internal resistance of a capacity depends on the nature of the dielectric in which it is immersed.
23.
The yellow sector of the temperature gauge corresponds to
a frequent operating range.
an exceptional operating range
a normal operating range.
a forbidden operating range
24.
A ""Bourdon Tube"" is used in
pressure sensors
vibration detectors
turbine temperature probes
smoke detectors
25.
The temperature measured by the CHT (Cylinder Head temperature) probe is the
average temperature within the whole set of cylinders.
temperature of the exhaust gases.
temperature within the hottest cylinder, depending on its position in the engine block.
temperature of the carburator to be monitored when the outside air temperature is between -5°C and 10°C.
26.
The measurement of the turbine temperature or of the EGT (Exhaust Gas Temperature) is carried out at the
high pressure chamber intake.
combustion chamber outlet
high pressure turbine outlet.
combustion chamber intake.
27.
On an aeroplane equipped with a constant speed propeller, the RPM indicator enables
control of the propeller regulator and the display of propeller RPM
control of power.
selection of engine RPM.
on a twin-engine aeroplane, automatic engine synchronisation.
28.
The principle of detection of a vibration monitoring system is based on the use of
a frequency converter.
2 high and low frequency filters.
2 high and low frequency amplifiers.
2 accelerometers.
29.
The advantages of an electric float gauge are:1- ease of manufacture2- independence of the indication relative to the variations of the aircraft power system if the measurement is made by a ratiometer3- independence of the indication relative to the variations of the aircraft power system if the measurement is made by a galvanometer4- independence of the indication relative to temperature variationsThe combination regrouping all the correct statements is
1, 3, 4
1, 2, 3, 4
1, 2, 4
2, 3, 4
30.
The advantages of a D.C. generator tachometer are:1- easy transmission of the information.2- independence of the information relative to the airborne electrical power supply.3- freedom from any spurious current due to the commutator.The combination regrouping all the correct statements is
1, 3.
2, 3.
1, 2, 3.
1, 2.
31.
In an average or heavy weight transport airplane, generally, the fuel quantity is measured by ""capacitor"" gauges because these give :1- indications partly independent of fuel temperature variations2- indications almost independent of the airplane's attitude and accelerations3- indications expressed in densityThe combination regrouping all the correct statements is
1, 2, 3
2
1, 2
1,3
32.
The RPM indicator (or tachometer) of a piston engine can include a small red arc within the arc normally used (green arc)In the RPM range corresponding to this small red arc the
propoller generates vibration, continuous rating is forbidden
rating is the minimum usable in cruise
propeller efficency is minimum at this rating
rating is the maximum possible in continuous mode
33.
The transmitter of RPM indicator may consist of :1- a magnetic sensor supplying an induced AC voltage2- a DC generator supplying a DC voltage3- a single-phase AC generator supplying an AC voltage4- a three-phase AC generator supplying a three-phase voltageThe combination of correct statements is
1,2,3
1,2,3,4
1,4
2,3,4
34.
The airplane outside air temperature ""probe"" measures the
""total"" air temperature minus compressibility effects in order to obtain the static temperature.
""total"" air temperature minus kinetic heating effects in order to obtain the static temperature.
""static"" air temperature minus compressibility effects in order to obtain the total temperature.
""static"" air temperature minus kinetic heating effects in order to obtain the total temperature.
35.
In transport airplanes, the temperatures are generally measured with :1- resistance thermometers2- thermocouple thermometers3- reactance thermometers4- capacitance thermometers5- mercury thermometersThe combination regrouping all the correct statements is
1, 2
1, 3, 4, 5
2, 3
1, 2, 5
36.
In an engine vibration monitoring system for a turbojet any vibration produced by the engine is
directly proportional to engine speed.
fed directly to the cockpit indicator without amplification or filtering.
inversely proportional to engine speed.
amplified and filtered before being fed to the cockpit indicator.
37.
The operating principle of the ""induction"" type of tachometer is to measure the
frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
magnetic field produced by a dynamo or an alternator
electromotive force (EMF) produced by a dynamo or an alternator.
rotation speed of an asynchronous motor energized by an alternator.
38.
A thermocouple type thermometer consists of
two metal conductors of the same type connected at two points.
a Wheatstone bridge connected to a voltage indicator.
two metal conductors of different type connected at one point.
a single-wire metal winding.
39.
The signal supplied by a transmitter fitted with a magnetic sensor, connected to an RPM indicator is
a DC voltage varying with the RPM , the indicator is a simple voltmeter with a rev/min. scale
an AC voltage, the frequency of which varies with the RPM, the indicator converts the signal into square pulses which are then counted
a three-phase voltage frequency varies with the RPM, the indicator is provided with a motor which drives a magnetic tachometer
an AC voltage varying with the RPM , the indicator rectifies the signal via a diode bridge and is provided with a voltmeter
40.
The sensors used to measure the exhaust gas temperature on an aircraft equipped with turbojets are
capacitors whose capacity varies proportionnally with temperature.
thermocouples.
based on metallic conductors whose resistance increases linearly with temperature.
based on metallic parts whose expansion/contraction is measured.
41.
To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle
bi-metallic strip
gas pressure
liquid expansion
thermocouple
42.
A synchroscope is used on aircraft to
achieve optimum control of on-board voltages.
reduce the vibration of each engine.
set several engines to the same speed.
reduce the rpm of each engine.
43.
The signal supplied by a transmitter fitted with a 3-phase AC generator, connected to RPM indicator, is
a three-phase voltage, the frequency of which varies with the RPM, the indicator is provided with a motor which drives a magnetic tachometer
an AC voltage, the frequency of which varies with the RPM, the indicator converts the signal into square pulses which are then counted
a DC voltage varying with the RPM, the indicator is a plain voltmeter with a rev/min. scale
an AC voltage varying with the RPM, the indicator rectifies the signal via a diode bridge and is provided with a voltmeter
44.
If a manifold pressure gauge consistently registers atmospheric pressure, the cause is probably
too high float level.
fuel of too low volatility.
ice in induction system.
leak in pressure gauge line
45.
The advantages of an ""electric"" fuel (float) gauge are :1- easy construction2- independence of indications with regard to airplane attitude3- independence of indications with regard to the accelerations 4- independence of indications with regard to temperature variations5- independence of indications with regard to vibrationsThe combination regrouping all the correct statements is
1
1, 2, 3, 4, 5
2, 3, 4
2, 3, 4, 5
46.
The probe used to measure the air intake pressure of a gas turbine engined powerplant
a Bourdon tube.
a bellows sensor.
an aneroid capsule.
a differential capsule.
47.
The disadvantages of a single-phase A.C. generator tachometer are:1- the presence of spurious signals due to a D.C. generator commutator2- the importance of line resistance on the information value3- the influence of temperature on the tachometer informationThe combination regrouping all the correct statements is
1, 2.
1, 3.
1, 2, 3.
2.
48.
A thermocouple can be made of
a single wire coil.
two metal conductors of different nature fixed together at two points.
two metal conductors of the same nature fixed together at two points.
a three wire coil.
49.
A manifold pressure gauge of a piston engine measures
absolute airpressure entering the carburettor.
vacuum in the carburettor
fuel pressure leaving the carburettor.
absolute pressure in intake system near the inlet valve
50.
A vibration indicator receives a signal from different sensors (accelerometers). It indicates the
acceleration measured by the sensors, expressed in g
vibration period expressed in seconds
vibration frequency expressed in Hz
vibration amplitude at a given frequency
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