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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.
A synchroscope is used on aircraft to
reduce the vibration of each engine.
reduce the rpm of each engine.
achieve optimum control of on-board voltages.
set several engines to the same speed.
2.
The quantity of fuel in the tanks is measured by capacitor type contents gauges. The working principle of these sensors is to measure the
di-electric resistivity of the fuel
charge of condensors
height of the fuel
volume of the fuel
3.
If the tanks of your airplane only contain water, the capacitor gauges indicate
a mass of water different from zero, but inaccurate.
a mass equal to zero.
a mass equal to the mass of a same volume of fuel.
the exact mass of water contained in the tanks.
4.
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
rating is the maximum possible in continuous mode
rating is the minimum usable in cruise
propeller efficency is minimum at this rating
propoller generates vibration, continuous rating is forbidden
5.
A vibration indicator receives a signal from different sensors (accelerometers). It indicates the
vibration amplitude at a given frequency
vibration period expressed in seconds
vibration frequency expressed in Hz
acceleration measured by the sensors, expressed in g
6.
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
2, 3
1, 2, 5
1, 3, 4, 5
7.
The red pointer which is normally on the red line on the EGT (Exhaust Gas Temperature) indicators
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.
shows the vibration level of the engine under consideration.
8.
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
hot junction is maintained constant.
hot junction is maintained at 15 °C.
cold junction is maintained at 15 °C.
cold junction is maintained constant.
9.
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, 2, 4
1, 2, 3, 4
1, 3, 4
2, 3, 4
10.
The sensors used to measure the exhaust gas temperature on an aircraft equipped with turbojets are
based on metallic parts whose expansion/contraction is measured.
thermocouples.
capacitors whose capacity varies proportionnally with temperature.
based on metallic conductors whose resistance increases linearly with temperature.
11.
The airplane outside air temperature ""probe"" measures the
""total"" air temperature minus kinetic heating effects in order to obtain the static temperature.
""total"" air temperature minus compressibility effects in order to obtain the static temperature.
""static"" air temperature minus kinetic heating effects in order to obtain the total temperature.
""static"" air temperature minus compressibility effects in order to obtain the total temperature.
12.
Torque can be determined by measuring the
frequency of an impulse tachometer attached to a transmission shaft.
quantity of light passing through a rack-wheel attached to a transmission shaft.
phase difference between 2 impulse tachometers attached to a transmission shaft.
oil pressure at the fixed crown of an epicycloidal reducer of the main engine gearbox.
13.
A thermocouple can be made of
two metal conductors of different nature fixed together at two points.
a single wire coil.
a three wire coil.
two metal conductors of the same nature fixed together at two points.
14.
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 not the same as those constituting the thermocouple.
these metals are maintained at a temperature lower than that of the cold source.
contact points are maintained at equal temperature between these different metals.
these metals are maintained at a temperature higher than that of the cold source.
15.
The electronic tachometer sensor is composed of
the rotor of a single phase A.C. generator.
the rotor of a three-phase A.C. generator.
a notched wheel rotating in front of an electro-magnet.
a circular magnet with four poles.
16.
To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle
gas pressure
thermocouple
bi-metallic strip
liquid expansion
17.
The static air temperature (SAT) is
a differential temperature expressed in degrees Kelvin
a relative temperature expressed in degrees Celsius
an absolute temperature expressed in degrees Celsius
a relative temperature expressed in degrees Kelvin
18.
A manifold pressure gauge of a piston engine measures
vacuum in the carburettor
fuel pressure leaving the carburettor.
absolute pressure in intake system near the inlet valve
absolute airpressure entering the carburettor.
19.
When compared with the volumetric fuel flowmeter, the mass fuel flowmeter takes into account the fuel
density.
dielectrical constant.
pressure.
temperature.
20.
The basic principle used for measuring a quantity of fuel in a transport airplane equipped with ""capacitor"" gauges is that the
capacity of a capacitor depends on the nature of the dielectric in which it isimmersed.
capacity of a capacitor depends on the distance between its plates.
internal resistance of a capacity depends on the nature of the dielectric in which it is immersed.
electromotive force of a capacity depends on the nature of the dielectric in which it is immersed.
21.
A ""Bourdon Tube"" is used in
vibration detectors
pressure sensors
turbine temperature probes
smoke detectors
22.
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 varying with the RPM, the indicator rectifies the signal via a diode bridge and is provided with a voltmeter
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
23.
The probe used to measure the air intake pressure of a gas turbine engined powerplant
an aneroid capsule.
a bellows sensor.
a Bourdon tube.
a differential capsule.
24.
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
quantity of fuel movement
volume and viscosity of the fuel
volumetric mass and di-electric resistance of the fuel
25.
The capacity fuel gauges provide information
on mass whose indication varies with the temperature of the fuel.
which is independent of the temperature of the fuel.
which varies with the temperature of the fuel.
on mass whose indication is independent of the temperature of the fuel.
26.
The pressure probe used to measure the pressure of a low pressure fuel pump is
a Bourdon tube.
a bellows sensor.
an aneroid capsule.
a differential capsule.
27.
In a 3-phase synchronous motor type tachometer indicator :1- the transmitter is a direct current generator2- the voltage is proportional to the transmitter drive speed 3- the frequency is proportional to the transmitter drive speed4- the speed indicating element is a galvanometer5. the speed indicating element is an asynchronous motor driving a magnetic tachometerThe combination regrouping all the correct statements is
3, 5
1, 4
2, 5
1, 2
28.
In an engine vibration monitoring system for a turbojet any vibration produced by the engine is
inversely proportional to engine speed.
fed directly to the cockpit indicator without amplification or filtering.
amplified and filtered before being fed to the cockpit indicator.
directly proportional to engine speed.
29.
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
3,1,2
3,2,1
2,1,3
30.
The main advantage of a ratiometer-type temperature indicator is that it
is simple.
can operate without an electrical power supply.
is very accurate.
carries out an independent measurement of the supply voltage.
31.
In order to measure temperature the cylinder head temperature (CHT) gauge utilises a
ratiometer circuit.
a) thermocouple consisting of two dissimilar metals.
wheatstone bridge circuit.
bourdon tube.
32.
The operating principle of an ""electronic"" tachometer is to measure the
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.
electromotive force (EMF) produced by a dynamo or an alternator.
33.
The disadvantage of an electronic rpm indicator is the
influence of temperature on the indication.
high influence of line resistance on the indication.
necessity of providing a power supply source.
generation of spurious signals at the commutator.
34.
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
twice that of air and varies directly with density.
the same as that of air and varies directly with density.
the same as that of air and varies inversely with density.
twice that of air and varies inversely with density
35.
Among the following engine instruments, the one operating with an aneroid pressure diaphragm is the
manifold pressure gauge.
oil thermometer.
fuel pressure gauge
oil pressure gauge.
36.
On an aeroplane equipped with a constant speed propeller, the RPM indicator enables
control of the propeller regulator and the display of propeller RPM
selection of engine RPM.
on a twin-engine aeroplane, automatic engine synchronisation.
control of power.
37.
The operating principle of the ""induction"" type of tachometer is to measure the
electromotive force (EMF) produced by a dynamo or an alternator.
magnetic field 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.
38.
The principle of capacitor gauges is based on
the variation in capacity of a condensor with the nature of the dielectric
the current variation in a Wheastone bridge
the variation of capacity by volumetric measurement exercised on the sensor
the variation of flow and torque exercised in a supply line
39.
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
1,4
1,2,3,4
2,3,4
40.
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, 2, 3.
2.
1, 3.
41.
The yellow sector of the temperature gauge corresponds to
an exceptional operating range
a normal operating range.
a frequent operating range.
a forbidden operating range
42.
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.
43.
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.
higher lower than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).
lower than Static Air Temperature (SAT) depending on the altitude.
44.
The principle of detection of a vibration monitoring system is based on the use of
2 accelerometers.
2 high and low frequency filters.
a frequency converter.
2 high and low frequency amplifiers.
45.
The indication of a fuel float gauge varies with :1- aircraft attitude2- accelerations3- atmospheric pressure4- temperatureThe combination of correct statements is
1,2,3,4
4
1,2
1,2,4
46.
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.
47.
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)
48.
The white sector of the arc of a temperature gauge corresponds to
a normal operating range.
an exceptional operating range.
a special operating range.
a forbidden operating range.
49.
The float type fuel gauges provide information on
volume whose indication varies with the temperature of the fuel.
mass whose indication varies with the temperature of the fuel.
volume whose indication is independent of the temperature of the fuel.
mass whose indication is independent of the temperature of the fuel.
50.
The disavantages of an ""electric"" fuel (float) gauge are :1- the design is complex2- the indications are influenced by the airplane attitude variations3- the indications are influenced by the accelerations 4- the indications are influenced by temperature variations5- that an alternative current supply is necessaryThe combination regrouping all the correct statements is
2, 3, 4
2, 3, 4, 5
1
1, 2, 3, 4
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