PRESSURE FUEL AND TEMPERATURE GAUGE – Air – DGCA Question Bank For Politics

#1. If a manifold pressure gauge consistently registers atmospheric pressure, the cause is probably

fuel of too low volatility.

ice in induction system.

too high float level.

leak in pressure gauge line

#2. A manifold pressure gauge of a piston engine measures :

absolute pressure in intake system near the inlet valve

vacuum in the carburettor

absolute airpressure entering the carburettor.

fuel pressure leaving the carburettor.

#3. 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

2,1,3

3,2,1

#4. Among the following engine instruments, the one operating with an aneroid pressure diaphragm is the :

fuel pressure gauge

oil pressure gauge.

manifold pressure gauge.

oil thermometer.

#5. The pressure probe used to measure the pressure of a low pressure fuel pump is:

an aneroid capsule.

a bellows sensor.

a Bourdon tube.

a differential capsule.

#6. The probe used to measure the air intake pressure of a gas turbine engined powerplant

a differential capsule.

an aneroid capsule.

a Bourdon tube.

a bellows sensor.

#7. A ""Bourdon Tube"" is used in:

smoke detectors

vibration detectors

turbine temperature probes

pressure sensors

#8. The yellow sector of the temperature gauge corresponds to:

an exceptional operating range

a forbidden operating range

a normal operating range.

a frequent operating range.

#9. The white sector of the arc of a temperature gauge corresponds to:

a forbidden operating range.

an exceptional operating range.

a normal operating range.

a special operating range.

#10. The sensors used to measure the exhaust gas temperature on an aircraft equipped with turbojets are:

thermocouples.

based on metallic conductors whose resistance increases linearly with temperature.

capacitors whose capacity varies proportionnally with temperature.

based on metallic parts whose expansion/contraction is measured.

#11. The measurement of the turbine temperature or of the EGT (Exhaust Gas Temperature) is carried out at the :

high pressure chamber intake.

combustion chamber intake.

high pressure turbine outlet.

combustion chamber outlet

#12. 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)

#13. A thermocouple type thermometer consists of:

two metal conductors of different type connected at one point.

a single-wire metal winding.

a Wheatstone bridge connected to a voltage indicator.

two metal conductors of the same type connected at two points.

#14. The total air temperature (TAT) is always :

higher than Static Air Temperature (SAT) depending on the Calibrated Air Speed (CAS).

higher lower 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.

#15. The static air temperature (SAT) is :

a relative temperature expressed in degrees Kelvin

a differential temperature expressed in degrees Kelvin

a relative temperature expressed in degrees Celsius

an absolute temperature expressed in degrees Celsius

#16. In order to measure temperature the cylinder head temperature (CHT) gauge utilises a :

wheatstone bridge circuit.

a) thermocouple consisting of two dissimilar metals.

ratiometer circuit.

bourdon tube.

#17. To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle:

thermocouple

liquid expansion

gas pressure

bi-metallic strip

#18. 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 of the exhaust gases.

average temperature within the whole set of cylinders.

temperature within the hottest cylinder, depending on its position in the engine block.

#19. A thermocouple can be made of:

a single wire coil.

two metal conductors of different nature fixed together at two points.

a three wire coil.

two metal conductors of the same nature fixed together at two points.

#20. 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 compressibility 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 kinetic heating effects in order to obtain the total temperature.

#21. 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 :

2, 3

1, 3, 4, 5

1, 2

1, 2, 5

#22. 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 simple.

is very accurate.

#23. 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.

hot junction is maintained constant.

hot junction is maintained at 15 °C.

cold junction is maintained at 15 °C.

#24. 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.

contact points are maintained at equal temperature between these different metals.

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.

#25. A synchroscope is used on aircraft to:

set several engines to the same speed.

reduce the vibration of each engine.

reduce the rpm of each engine.

achieve optimum control of on-board voltages.

#26. The red pointer which is normally on the red line on the EGT (Exhaust Gas Temperature) indicators:

shows the limit value not to be exceeded.

allows the display of the parameter value to be adopted during take-off.

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.

#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:

1, 2

3, 5

2, 5

1, 4

#28. The disadvantage of an electronic rpm indicator is the :

necessity of providing a power supply source.

high influence of line resistance on the indication.

influence of temperature on the indication.

generation of spurious signals at the commutator.

#29. 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

#30. The signal supplied by a transmitter fitted with a magnetic sensor, connected to an RPM indicator is :

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 simple voltmeter with a rev/min. scale

a three-phase voltage frequency varies with the RPM, the indicator is provided with a motor which drives a magnetic tachometer

#31. 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 :

1,2,3,4

1,2,3

1,4

2,3,4

#32. The operating principle of an ""electronic"" tachometer is to measure the:

rotation speed of an asynchronous motor energized by an alternator.

electromotive force (EMF) produced by a dynamo or an alternator.

magnetic field produced by a dynamo or an alternator.

frequency of the electric impulse created by a notched wheel rotating in a magnetic field.

#33. On an aeroplane equipped with a constant speed propeller, the RPM indicator enables :

control of power.

control of the propeller regulator and the display of propeller RPM

selection of engine RPM.

on a twin-engine aeroplane, automatic engine synchronisation.

#34. The operating principle of the ""induction"" type of tachometer is to measure the:

rotation speed of an asynchronous motor energized by an alternator.

magnetic field produced by a dynamo or an alternator

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.

#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, 3, 4.

1, 2, 4.

1, 3, 4.

2, 3, 4.

#36. 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.

1, 2, 3.

#37. 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:

2,4

2, 3, 4.

1, 2, 3, 4.

1, 3.

#38. 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, 3.

1, 2.

2.

1, 3.

#39. 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

volumetric mass and di-electric resistance of the fuel

quantity of fuel movement

#40. A paddle-wheel placed in a the fuel circuit of a gas turbine engine initially measures:

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

volumetric flow by a tally of the impulses

#41. When compared with the volumetric fuel flowmeter, the mass fuel flowmeter takes into account the fuel :

pressure.

dielectrical constant.

temperature.

density.

#42. The float type fuel gauges provide information on:

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.

mass whose indication varies with the temperature of the fuel.

#43. The capacity fuel gauges provide information:

which varies with 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 is independent of the temperature of the fuel.

#44. 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.

current variation in the Wheatstone bridge.

flow rate and torque variation occurring in a supply line.

#45. 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

volume of the fuel

height of the fuel

di-electric resistivity of the fuel

#46. 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

#47. The principle of capacitor gauges is based on:

the variation of flow and torque exercised in a supply line

the current variation in a Wheastone bridge

the variation in capacity of a condensor with the nature of the dielectric

the variation of capacity by volumetric measurement exercised on the sensor

#48. 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

2, 3, 4

1, 2, 3, 4, 5

2, 3, 4, 5

#49. 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

#50. 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, 3

1,3

1, 2

#51. The basic principle used for measuring a quantity of fuel in a transport airplane equipped with ""capacitor"" gauges is that the:

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.

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.

#52. If the tanks of your airplane only contain water, the capacitor gauges indicate:

a mass of water different from zero, but inaccurate.

the exact mass of water contained in the tanks.

a mass equal to the mass of a same volume of fuel.

a mass equal to zero.

#53. 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

#54. 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 inversely with density

twice that of air and varies directly with density.

the same as that of air and varies inversely with density.

the same as that of air and varies directly with density.

#55. 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.

#56. The principle of detection of a vibration monitoring system is based on the use of:

2 high and low frequency filters.

2 accelerometers.

a frequency converter.

2 high and low frequency amplifiers.

#57. 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.

directly proportional to engine speed.

inversely proportional to engine speed.

amplified and filtered before being fed to the cockpit indicator.

#58. A vibration indicator receives a signal from different sensors (accelerometers). It indicates the :

vibration period expressed in seconds

vibration amplitude at a given frequency

vibration frequency expressed in Hz

acceleration measured by the sensors, expressed in g

#59. 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 minimum usable in cruise

propeller efficency is minimum at this rating

propoller generates vibration, continuous rating is forbidden

rating is the maximum possible in continuous mode

#60. The electronic tachometer sensor is composed of:

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.

a circular magnet with four poles.

Dgca Question Bank For Pilots

Results

#1. If a manifold pressure gauge consistently registers atmospheric pressure, the cause is probably

#2. A manifold pressure gauge of a piston engine measures :

#3. 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

#4. Among the following engine instruments, the one operating with an aneroid pressure diaphragm is the :

#5. The pressure probe used to measure the pressure of a low pressure fuel pump is:

#6. The probe used to measure the air intake pressure of a gas turbine engined powerplant

#7. A ""Bourdon Tube"" is used in:

#8. The yellow sector of the temperature gauge corresponds to:

#9. The white sector of the arc of a temperature gauge corresponds to:

#10. The sensors used to measure the exhaust gas temperature on an aircraft equipped with turbojets are:

#11. The measurement of the turbine temperature or of the EGT (Exhaust Gas Temperature) is carried out at the :

#12. Given :M is the Mach numberTs is the static temperatureTt is the total temperature

#13. A thermocouple type thermometer consists of:

#14. The total air temperature (TAT) is always :

#15. The static air temperature (SAT) is :

#16. In order to measure temperature the cylinder head temperature (CHT) gauge utilises a :

#17. To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle:

#18. The temperature measured by the CHT (Cylinder Head temperature) probe is the :

#19. A thermocouple can be made of:

#20. The airplane outside air temperature ""probe"" measures the :

#21. 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 :

#22. The main advantage of a ratiometer-type temperature indicator is that it:

#23. 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:

#24. The electromotive force of a thermocouple is not modified if one or several intermediate metals are inserted in the circuit provided that:

#25. A synchroscope is used on aircraft to:

#26. The red pointer which is normally on the red line on the EGT (Exhaust Gas Temperature) indicators:

#28. The disadvantage of an electronic rpm indicator is the :

#29. The signal supplied by a transmitter fitted with a 3-phase AC generator, connected to RPM indicator, is :

#30. The signal supplied by a transmitter fitted with a magnetic sensor, connected to an RPM indicator is :

#32. The operating principle of an ""electronic"" tachometer is to measure the:

#33. On an aeroplane equipped with a constant speed propeller, the RPM indicator enables :

#34. The operating principle of the ""induction"" type of tachometer is to measure the:

#36. 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:

#39. The operating principle of Flowmeters, or ""unit flow meters,"" the most commonly used at the present time, is to measure across their system the :

#40. A paddle-wheel placed in a the fuel circuit of a gas turbine engine initially measures:

#41. When compared with the volumetric fuel flowmeter, the mass fuel flowmeter takes into account the fuel :

#42. The float type fuel gauges provide information on:

#43. The capacity fuel gauges provide information:

#44. The principle of capacity gauges is based on the:

#45. The quantity of fuel in the tanks is measured by capacitor type contents gauges. The working principle of these sensors is to measure the :

#46. The indication of a fuel float gauge varies with :1- aircraft attitude2- accelerations3- atmospheric pressure4- temperatureThe combination of correct statements is :

#47. The principle of capacitor gauges is based on:

#51. The basic principle used for measuring a quantity of fuel in a transport airplane equipped with ""capacitor"" gauges is that the:

#52. If the tanks of your airplane only contain water, the capacitor gauges indicate:

#54. 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:

#55. Torque can be determined by measuring the :

#56. The principle of detection of a vibration monitoring system is based on the use of:

#57. In an engine vibration monitoring system for a turbojet any vibration produced by the engine is :

#58. A vibration indicator receives a signal from different sensors (accelerometers). It indicates the :

#59. 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 :

#60. The electronic tachometer sensor is composed of: