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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 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, 3.
1, 2.
2, 3.
1, 3.
2.
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 vibration level of the engine under consideration.
moves when the corresponding value is exceeded and remains positioned at the maximum value that has been reached.
shows the limit value not to be exceeded.
3.
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.
4.
A paddle-wheel placed in a the fuel circuit of a gas turbine engine initially measures
volumetric flow by a tally of the impulses
mass flow by a tally of the impulses
mass flow by measure of a voltage proportional to the rotational speed
volumetric flow by measure of a voltage proportional to the rotational speed
5.
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
6.
The yellow sector of the temperature gauge corresponds to
a forbidden operating range
an exceptional operating range
a frequent operating range.
a normal operating range.
7.
A ""Bourdon Tube"" is used in
smoke detectors
turbine temperature probes
vibration detectors
pressure sensors
8.
The measurement of the turbine temperature or of the EGT (Exhaust Gas Temperature) is carried out at the
high pressure turbine outlet.
combustion chamber intake.
high pressure chamber intake.
combustion chamber outlet
9.
Among the following engine instruments, the one operating with an aneroid pressure diaphragm is the
fuel pressure gauge
manifold pressure gauge.
oil pressure gauge.
oil thermometer.
10.
A thermocouple type thermometer consists of
two metal conductors of different type connected at one point.
two metal conductors of the same type connected at two points.
a single-wire metal winding.
a Wheatstone bridge connected to a voltage indicator.
11.
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
12.
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
1,3
1, 2, 3
1, 2
13.
The airplane outside air temperature ""probe"" measures the
""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.
""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.
14.
Given :M is the Mach numberTs is the static temperatureTt is the total temperature
Ts = Tt.(1+0.2. M²)
Ts = Tt.(0.2. M²)
Ts = Tt/( 0.2 M²)
Ts = Tt /(1+0.2. M²)
15.
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
16.
The operating principle of Flowmeters, or ""unit flow meters,"" the most commonly used at the present time, is to measure across their system the
volume and viscosity of the fuel
pressure and temperature of the fuel
quantity of fuel movement
volumetric mass and di-electric resistance of the fuel
17.
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
18.
The principle of detection of a vibration monitoring system is based on the use of
a frequency converter.
2 accelerometers.
2 high and low frequency filters.
2 high and low frequency amplifiers.
19.
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
2, 3, 4
1, 2, 4
1, 3, 4
20.
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
21.
The principle of capacitor gauges is based on
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
the variation in capacity of a condensor with the nature of the dielectric
22.
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
23.
The total air temperature (TAT) is always
higher than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).
lower than Static Air Temperature (SAT) depending on the altitude.
higher lower than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).
higher than Static Air Temperature (SAT) depending on the altitude.
24.
The quantity of fuel in the tanks is measured by capacitor type contents gauges. The working principle of these sensors is to measure the
height of the fuel
di-electric resistivity of the fuel
charge of condensors
volume of the fuel
25.
The pressure probe used to measure the pressure of a low pressure fuel pump is
a bellows sensor.
a differential capsule.
an aneroid capsule.
a Bourdon tube.
26.
The capacity fuel gauges provide information
which is independent of the temperature of the fuel.
on mass whose indication varies with the temperature of the fuel.
on mass whose indication is independent of the temperature of the fuel.
which varies with the temperature of the fuel.
27.
On an aeroplane equipped with a constant speed propeller, the RPM indicator enables
control of power.
selection of engine RPM.
control of the propeller regulator and the display of propeller RPM
on a twin-engine aeroplane, automatic engine synchronisation.
28.
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, 4
3, 5
1, 2
2, 5
29.
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.
30.
A vibration indicator receives a signal from different sensors (accelerometers). It indicates the
vibration frequency expressed in Hz
acceleration measured by the sensors, expressed in g
vibration period expressed in seconds
vibration amplitude at a given frequency
31.
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
rating is the maximum possible in continuous mode
propeller efficency is minimum at this rating
32.
The electronic tachometer sensor is composed of
the rotor of a three-phase A.C. generator.
a circular magnet with four poles.
a notched wheel rotating in front of an electro-magnet.
the rotor of a single phase A.C. generator.
33.
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
1, 3.
2, 3, 4.
2, 4.
1, 2, 3, 4.
34.
In order to measure temperature the cylinder head temperature (CHT) gauge utilises a
bourdon tube.
wheatstone bridge circuit.
ratiometer circuit.
a) thermocouple consisting of two dissimilar metals.
35.
To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle
bi-metallic strip
thermocouple
liquid expansion
gas pressure
36.
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
1, 2, 3, 4
2, 3, 4, 5
1
37.
A synchroscope is used on aircraft to
reduce the rpm of each engine.
set several engines to the same speed.
reduce the vibration of each engine.
achieve optimum control of on-board voltages.
38.
Torque can be determined by measuring the
quantity of light passing through a rack-wheel attached to a transmission shaft.
phase difference between 2 impulse tachometers attached to a transmission shaft.
frequency of an impulse tachometer attached to a transmission shaft.
oil pressure at the fixed crown of an epicycloidal reducer of the main engine gearbox.
39.
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 constant.
cold junction is maintained at 15 °C.
hot junction is maintained at 15 °C.
hot junction is maintained constant.
40.
The probe used to measure the air intake pressure of a gas turbine engined powerplant
a differential capsule.
a Bourdon tube.
an aneroid capsule.
a bellows sensor.
41.
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.
42.
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
43.
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.
a mass of water different from zero, but inaccurate.
the exact mass of water contained in the tanks.
44.
The sensors used to measure the exhaust gas temperature on an aircraft equipped with turbojets are
thermocouples.
based on metallic parts whose expansion/contraction is measured.
capacitors whose capacity varies proportionnally with temperature.
based on metallic conductors whose resistance increases linearly with temperature.
45.
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.
internal resistance 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.
46.
When compared with the volumetric fuel flowmeter, the mass fuel flowmeter takes into account the fuel
temperature.
dielectrical constant.
pressure.
density.
47.
The temperature measured by the CHT (Cylinder Head temperature) probe is the
temperature of the exhaust gases.
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.
average temperature within the whole set of cylinders.
48.
The indication of a fuel float gauge varies with :1- aircraft attitude2- accelerations3- atmospheric pressure4- temperatureThe combination of correct statements is
1,2,4
1,2,3,4
4
1,2
49.
A manifold pressure gauge of a piston engine measures
absolute pressure in intake system near the inlet valve
absolute airpressure entering the carburettor.
vacuum in the carburettor
fuel pressure leaving the carburettor.
50.
The disadvantage of an electronic rpm indicator is the
influence of temperature on the indication.
high influence of line resistance on the indication.
generation of spurious signals at the commutator.
necessity of providing a power supply source.
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