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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 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 flow and torque exercised in a supply line
the variation of capacity by volumetric measurement exercised on the sensor
2.
The indication of a fuel float gauge varies with :1- aircraft attitude2- accelerations3- atmospheric pressure4- temperatureThe combination of correct statements is
4
1,2
1,2,4
1,2,3,4
3.
A vibration indicator receives a signal from different sensors (accelerometers). It indicates the
vibration amplitude at a given frequency
acceleration measured by the sensors, expressed in g
vibration frequency expressed in Hz
vibration period expressed in seconds
4.
A thermocouple can be made of
a single wire coil.
a three wire coil.
two metal conductors of the same nature fixed together at two points.
two metal conductors of different nature fixed together at two points.
5.
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
1,4
1,2,3,4
1,2,3
2,3,4
6.
The main advantage of a ratiometer-type temperature indicator is that it
carries out an independent measurement of the supply voltage.
can operate without an electrical power supply.
is very accurate.
is simple.
7.
Among the following engine instruments, the one operating with an aneroid pressure diaphragm is the
oil pressure gauge.
oil thermometer.
manifold pressure gauge.
fuel pressure gauge
8.
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 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.
capacity of a capacitor depends on the distance between its plates.
9.
The yellow sector of the temperature gauge corresponds to
a frequent operating range.
a normal operating range.
an exceptional operating range
a forbidden operating range
10.
The disadvantage of an electronic rpm indicator is the
necessity of providing a power supply source.
generation of spurious signals at the commutator.
high influence of line resistance on the indication.
influence of temperature on the indication.
11.
The signal supplied by a transmitter fitted with a magnetic sensor, connected to an RPM indicator is
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
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
12.
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, 5
1, 2, 3, 4
1
2, 3, 4
13.
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, 3.
1, 2, 3, 4.
2, 4.
14.
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.
cold junction is maintained constant.
hot junction is maintained at 15 °C.
hot junction is maintained constant.
15.
The pressure probe used to measure the pressure of a low pressure fuel pump is
a Bourdon tube.
an aneroid capsule.
a bellows sensor.
a differential capsule.
16.
The operating principle of an ""electronic"" tachometer is to measure the
frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
electromotive force (EMF) produced by a dynamo or an alternator.
rotation speed of an asynchronous motor energized by an alternator.
magnetic field produced by a dynamo or an alternator.
17.
The operating principle of Flowmeters, or ""unit flow meters,"" the most commonly used at the present time, is to measure across their system the
quantity of fuel movement
pressure and temperature of the fuel
volume and viscosity of the fuel
volumetric mass and di-electric resistance of the fuel
18.
A manifold pressure gauge of a piston engine measures
absolute pressure in intake system near the inlet valve
absolute airpressure entering the carburettor.
fuel pressure leaving the carburettor.
vacuum in the carburettor
19.
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.
2.
1, 3.
1, 2, 3.
20.
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, 5
1, 2
2, 3
1, 3, 4, 5
21.
The electronic tachometer sensor is composed of
a circular magnet with four poles.
the rotor of a three-phase A.C. generator.
the rotor of a single phase A.C. generator.
a notched wheel rotating in front of an electro-magnet.
22.
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
1, 2
3, 5
2, 5
1, 4
23.
The airplane outside air temperature ""probe"" measures the
""static"" air temperature minus kinetic heating effects in order to obtain the total temperature.
""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 compressibility effects in order to obtain the total temperature.
24.
If the tanks of your airplane only contain water, the capacitor gauges indicate
a mass equal to the mass of a same volume of fuel.
a mass equal to zero.
the exact mass of water contained in the tanks.
a mass of water different from zero, but inaccurate.
25.
The total air temperature (TAT) is always
higher lower than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).
lower than Static Air Temperature (SAT) depending on the altitude.
higher than Static Air Temperature (SAT) depending on the altitude.
higher than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).
26.
In an engine vibration monitoring system for a turbojet any vibration produced by the engine is
fed directly to the cockpit indicator without amplification or filtering.
amplified and filtered before being fed to the cockpit indicator.
inversely proportional to engine speed.
directly proportional to engine speed.
27.
The temperature measured by the CHT (Cylinder Head temperature) probe is the
temperature of the carburator to be monitored when the outside air temperature is between -5°C and 10°C.
temperature within the hottest cylinder, depending on its position in the engine block.
temperature of the exhaust gases.
average temperature within the whole set of cylinders.
28.
The quantity of fuel in the tanks is measured by capacitor type contents gauges. The working principle of these sensors is to measure the
charge of condensors
height of the fuel
di-electric resistivity of the fuel
volume of the fuel
29.
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
2, 3, 4
2, 3, 4, 5
1
1, 2, 3, 4, 5
30.
The sensors used to measure the exhaust gas temperature on an aircraft equipped with turbojets are
based on metallic conductors whose resistance increases linearly with temperature.
thermocouples.
capacitors whose capacity varies proportionnally with temperature.
based on metallic parts whose expansion/contraction is measured.
31.
The principle of capacity gauges is based on the
capacitance variation of a given capacitor with the type of dielectric.
capacitance variation by the volume measurement carried out on the sensor.
flow rate and torque variation occurring in a supply line.
current variation in the Wheatstone bridge.
32.
The probe used to measure the air intake pressure of a gas turbine engined powerplant
a Bourdon tube.
an aneroid capsule.
a differential capsule.
a bellows sensor.
33.
On an aeroplane equipped with a constant speed propeller, the RPM indicator enables
control of power.
on a twin-engine aeroplane, automatic engine synchronisation.
control of the propeller regulator and the display of propeller RPM
selection of engine RPM.
34.
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 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.
these metals are maintained at a temperature lower than that of the cold source.
35.
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.
1, 3, 4.
1, 2, 3, 4.
2, 3, 4.
36.
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.
37.
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, 2.
1, 2, 3.
1, 3.
2, 3.
38.
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)
39.
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.
the same as that of air and varies inversely with density.
twice that of air and varies inversely with density
40.
The signal supplied by a transmitter fitted with a 3-phase AC generator, connected to RPM indicator, is
a DC voltage varying with the RPM, the indicator is a plain voltmeter with a rev/min. scale
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
41.
Torque can be determined by measuring the
oil pressure at the fixed crown of an epicycloidal reducer of the main engine gearbox.
quantity of light passing through a rack-wheel attached to a transmission shaft.
frequency of an impulse tachometer attached to a transmission shaft.
phase difference between 2 impulse tachometers attached to a transmission shaft.
42.
A ""Bourdon Tube"" is used in
pressure sensors
turbine temperature probes
smoke detectors
vibration detectors
43.
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, 3, 4
1, 2, 4
2, 3, 4
1, 3, 4
44.
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
propeller efficency is minimum at this rating
propoller generates vibration, continuous rating is forbidden
rating is the minimum usable in cruise
45.
A thermocouple type thermometer consists of
a Wheatstone bridge connected to a voltage indicator.
a single-wire metal winding.
two metal conductors of the same type connected at two points.
two metal conductors of different type connected at one point.
46.
When compared with the volumetric fuel flowmeter, the mass fuel flowmeter takes into account the fuel
temperature.
pressure.
density.
dielectrical constant.
47.
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
2
1, 2
1,3
1, 2, 3
48.
A paddle-wheel placed in a the fuel circuit of a gas turbine engine initially measures
mass flow by measure of a voltage proportional to the rotational speed
mass flow by a tally of the impulses
volumetric flow by measure of a voltage proportional to the rotational speed
volumetric flow by a tally of the impulses
49.
The principle of detection of a vibration monitoring system is based on the use of
2 high and low frequency amplifiers.
2 high and low frequency filters.
a frequency converter.
2 accelerometers.
50.
If a manifold pressure gauge consistently registers atmospheric pressure, the cause is probably
too high float level.
leak in pressure gauge line
ice in induction system.
fuel of too low volatility.
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