ENGINE & INSTRUMENTS – Air – DGCA Question Bank For Politics

#1. What type of sensor is used to measure the output of a low pressure booster pump

What type of sensor is used to measure the output of a low pressure booster pump

aneroid capsule

bellows

differential capsule

#2. A vibration meter measures

frequency in Hz

amplitude at a given frequency

period in seconds

acceleration in g

#3. Which of the following are used to measure temperature 1. thermocouple 2. resistance 3. reactance 4. mercury

1,2,3,4

1,2, & 4

2,3, & 4

1,3,& 4

#4. A millivoltmeter measuring electromotive force between a hot and a cold junction of a thermocouple can be graduated to read temperature if: -

the hot junction is kept at a constant temperature

the cold junction is maintained at 15 degrees C

the hot junction is maintained at 15 degrees C

the cold junction is maintained at a constant temperature

#5. If both displays of an EICAS system fail what information will be displayed on the standby engine indicator

N1,EPR,N2

N1,EPR, EGT

N2,EPR, EGT

EGT,N1, FF

#6. A capacitive type gauging system may measure mass due to:

fuel dielectric constant being equal to that of air and proportional to density

fuel dielectric constant being equal to that of air and proportional to1/density

fuel dielectric constant being twice that of air and proportional to density

fuel dielectric constant being twice that of air and proportional to 1/density

#7. If the intake probe of an EPR system becomes blocked with ice this will cause the EPR gauge to

under-read during take off

be unaffected

read zero

#8. The power output of a turbo-propeller aircraft is measured by the amount of torque being produced. The indication can be in which of the following units. 1. Newton metres 2. PSI 3. Percentage 4. Pounds feet 5. EPR

1,2,3,4,5

1,2,3,5

2,3,4,5

1,2,3,4

#9. If one probe of a multi-sensor T.G.T. system failed , the reading would:

increase by 20 – 30 degrees C

decrease by 20 – 30 degrees C

be practically unaffected

fall to zero

#10. During the take-off run , the effect of increasing airspeed is to cause the EPR indication to :

remain constant

increase

decrease

increase and subsequently decrease

#11. An advisory message on the EICAS system screen would be:

displayed in amber on the lower screen with associated caution lights and aural tones

displayed in red, normally on the upper screen , and requiring immediate corrective action

displayed in amber, normally on the upper screen with aural warnings .

displayed in amber, normally on the upper screen, indented one space to the right.

#12. A supercharged aircraft is climbing at its maximum permitted boost of 8 psi (16in.Hg) from sea level to its full throttle height of 10,000 feet. If sea level pressure is 29.92in.Hg , when the aircraft reaches 5000 feet, where the pressure is 24.72in.Hg, what will be the approximate indication on the MAP gauge.

18 in Hg

33 in Hg

41 in Hg

46 in Hg

#13. An aircraft has a compensated capacitance fuel contents gauging system and is refuelled so that the total fuel contents are 76000kg at a temperature of 18 degrees C and an S.G. of 0.81. Whilst the aircraft is parked the temperature increases to 26 degrees C and the S.G. becomes 0.80. The indicated fuel contents have.

increased by 5%

increased by 10%

decreased by 5%

remained the same

#14. The working principle of a capacitive fuel contents gauging system is based upon

volume of fuel

changes in capacitance

height of fuel

dielectric value

#15. A volumetric fuel flow meter is different to a mass flow meter because the mass flow meter compensates for:

dielectric

density

volume

pressure

#16. Cylinder head temperature measurement works on the principle of

differential expansion

wheatstone bridge

ratiometer

thermocouple

#17. The electrical tacho generator system uses

single phase a.c. whose frequency varies with the speed of the engine delivered to a single phase synchronous motor and drag cup.

three phase a.c. whose frequency varies with the speed of the engine delivered to a three phase synchronous motor (squirrel cage) and drag cup.

Single phase d.c. whose frequency varies with speed of the engine converted to a square wave pulse delivered to a servo driven instrument

#18. Where very accurate temperature indication is required the indicator used will be.

galvanometer

direct reading

moving coil

ratiometer

#19. Total Air Temperature (TAT) is equal to:

SAT + ram rise

RAT + friction rise

SAT – RAT

RAT + ram rise

#20. The principle of the fuel-monitoring device giving the fuel burnt is:

multiplying flight time by fuel consumption

capacitance variation of a capacitor

difference of indication according to departure value

integration of instantaneous flow

#21. To measure the fuel quantity on a heavy aircraft we use: 1 capacitor gauges 2 electric gauges with round floats 3 the indication can directly be indicated as a mass 4 the indication can not be indicated as a mass The combination of all correct statements is

1,4

2,3

2,4

1,3

#22. For a capacitor gauge: 1 the fuel dielectric value is half that of air 2 the fuel dielectric value varies proportionally to the temperature of the fuel 3 the probes are connected in parallel 4 fuel dielectric value varies inversely with the fuel level 5 the gauge accuracy is within 2% The correct statements are:

3,5

2,3

3,4

1,2

#23. The capacitor gauge principle is based on:

variation of capacitance of a capacitor with the nature of the dielectric

variation of capacitance by volume measure at the probe

variation of the EMF in a wheastone bridge

variation of outflow and couple in the system

#24. Among the following parameters: EGT EPR FF N1 N2 Oil pressure Fuel pressure The ones that can be used to monitor a gas turbine thrust setting are:

EGT, N1, N2, oil pressure

EGT, N1, FF, EPR

EGT, EPR, FF, High-pressure fuel

fuel pressure, N1, N2, oil pressure

#25. The most significant parameters and the most important that express the thrust of a gas turbine engine are;

EGT or N2

N2 and FF

FF and EGT

N1 and EPR

#26. On a modern twin spool turbofan, the main handling parameter is:

the temperature upstream the turbine or EGT

a rotational speed and a temperature

the rotational speed of the high-pressure compressor

the rotational speed of the low-pressure compressor

#27. Two main indications used to evaluate a turbojet thrust are:

rotational speed of the fan (N1 ) or the total pressure at the outlet of the low-pressure turbine

fan rotational speed (N1 ) or total pressure at the high-pressure compressor outlet

fan rotational speed (N1 ) or EPR

high pressure turbine rotational speed or EPR

#28. The measure of a torque can be made by measuring:

oil pressure at a fixed crown of an epicyclical reduction gear of the transmission box

the amount of light through a gear linked to a transmission shaft

the frequency of a phonic wheel linked to a transmission shaft

the frequency difference between two phonic wheels linked to a transmission shaft

#29. Among these instruments, which one uses aneroid capsules?

oil thermometer

air intake pressure sensor

oil pressure sensor

fuel pressure sensor

#30. In a three phase tachometer installation: 1 the transmitter is a DC generator 2 we measure an EMF proportional to the driving speed of the transmitter 3 we measure a frequency proportional to the driving speed of the transmitter 4 the receiver is a galvometer 5 the receiver is an synchronised motor driving a magnetic tachometer The correct statements are:

1,2

2,5

1,4

3,5

#31. The working principle of mass flow meters mostly used now days, is to measure in their system:

the volume and viscosity of the fuel

the temperature and pressure of the fuel

volume mass and dielectric value of fuel

kinetic energy transmitted

#32. The advantage of a ratiometer is

doesn’t require an electrical supply

does not suffer from errors due to variations of supply voltage

is calibrated at sea level and will be inaccurate at high altitudes

it requires an ac voltage and therefore has no commutator.

#33. What is a synchroscope used for

reducing vibration

putting the propellers in phase

allowing the pilot to adjust several engines to the same RPM

viewing the underside of the aircraft during flight

#34. On an EICAS display what does the yellow arc on the temperature gauge signify

Forbidden operating range

Exceptional operating range

Frequent operating range

#35. An RPM gauge has a red line at the upper end of the green arc, in the middle of the green arc is a smaller red arc. What is the significance of this smaller red arc

it indicates an RPM that must not be used continuously because of the increased vibration level from the engine/propeller

it is maximum continuous RPM

it is the RPM at which there is an increased likelihood of oil leakage

it indicates an RPM that must not be used continuously because there is insufficient cooling air for the engine

#36. In an ECAM system if a caution message appears the system will

illuminate the page number that requires to be selected

display a diagrammatic view of the affected system

will alert the pilot by an audible warning only

will cause the relevant buttons to light up

#37. A cylinder head temperature measuring system in a piston engine has a sensor

One in each cylinder head to average the temperature

One in the coolest running cylinder

One in the hottest running cylinder

One in each of the two banks of cylinders in a horizontally opposed engine

#38. The principles used in an electrical RPM indicating system are:- 1. Tacho probe and phonic wheel 2. DC generator producing AC 3. 3 phase AC generator driving a 3 phase AC motor 4. Single phase AC generator driving a single phase AC motor

1 and 4

1 and 3

2 and 3

2 and 4

#39. What does the yellow band on an EICAS generated engine gauge indicate?

Precautionary operating range

Maximum operating range

Warning limit

Normal range

#40. Advantage of a ratiometer type measuring circuit is

Very Accurate

Simple

Changes indication if voltage changes

No external power supply is required

#41. In a Turbojet thrust is measured by

Fan Speed (N1) and Turbine Inlet Pressure

N1 and EPR

Compressor outlet pressure and jet pipe pressure

Compressor inlet pressure and combustion chamber pressure

#42. How will a system failure warning be shown to the pilot in the ECAM system

The failure will appear as a wording on the screen

The master warning caption will illuminate and the pilot will manually select failure mode.

The master warning will illuminate and the primary screen will display a check list while the secondary shows a graphical display of the problem

The Engine parameter displays will be replaced by the Flight Mode screen

#43. What is used to measure gas turbine inlet pressure

Bourdon Tube

Differential capsule

Aneroid capsule

Bellows

#44. What does a bourdon tube measure

Temperature

Quantity

Capacitance

Pressure

#45. What are the disadvantages of an electrical float fuel quantity measuring system 1 Attitude 2 Acceleration 3 Temperature 4 Ambient pressure 5 Needs an AC power supply

1,2,3,4,5

1,2,3

1,2,5

2,3,4,5

#46. What are the disadvantages of an electrical float fuel quantity measuring system 1 Attitude 2 Acceleration 3 Temperature 4 Ambient pressure 5 Needs an AC power supply

1,2,3,4,5

1,2,3

1,2,5

2,3,4,5

#47. How can temperature be measured 1. Resistance 2. Mercury 3. Thermocouple 4. Reactance

1,2,3,4

1,2,4

1,2,3

1,3,4

#48. A Thermocouple would normally be used to measure the temperature of the:

Turbine

Exterior

Cabin

Oil

#49. The Bourdon Tube is used in:

Temperature probes in front of the engine

Smoke detectors

Pressure measurement

Vibration detectors

#50. The principle upon which flowmeters (mass flow) most commonly used today work, is to measure:

The Volume and Viscosity of the fuel

The Pressure and Temperature of the fuel

Density and Dielectric constant of the fuel

The Kinetic energy transferred

#51. A small turbine placed in the flow of fuel to the burners of a Gas Turbine engine measures:

Volume of flow by the measurement of magnetic impulses

Mass flow by the measurement of magnetic impulses

Mass flow by the measurement of frequency

Volume flow by the measurement of reactance

#52. The torquemeter is an instrument:

Allowing automatic synchronisation of the engines

Giving the power available by the engine

Giving the power from the propeller by direct reading

Allowing the determination of the power from the propeller by using a formula which is a function of the RPM

#53. Torque can be calculated in a torquemeter system by the measurement:

Of the oil pressure resisting lateral movement of the gearing in an epicyclic reduction gearbox

Of the amount of light through a gear wheel connected to the transmission

Of the frequency of a phonic wheel connected to the planet gears of an epicyclic gearbox

Of the difference between 2 phonic wheels connected to the transmission

Dgca Question Bank For Pilots

Results

#1. What type of sensor is used to measure the output of a low pressure booster pump

#2. A vibration meter measures

#3. Which of the following are used to measure temperature 1. thermocouple 2. resistance 3. reactance 4. mercury

#4. A millivoltmeter measuring electromotive force between a hot and a cold junction of a thermocouple can be graduated to read temperature if: -

#5. If both displays of an EICAS system fail what information will be displayed on the standby engine indicator

#6. A capacitive type gauging system may measure mass due to:

#7. If the intake probe of an EPR system becomes blocked with ice this will cause the EPR gauge to

#8. The power output of a turbo-propeller aircraft is measured by the amount of torque being produced. The indication can be in which of the following units. 1. Newton metres 2. PSI 3. Percentage 4. Pounds feet 5. EPR

#9. If one probe of a multi-sensor T.G.T. system failed , the reading would:

#10. During the take-off run , the effect of increasing airspeed is to cause the EPR indication to :

#11. An advisory message on the EICAS system screen would be:

#14. The working principle of a capacitive fuel contents gauging system is based upon

#15. A volumetric fuel flow meter is different to a mass flow meter because the mass flow meter compensates for:

#16. Cylinder head temperature measurement works on the principle of

#17. The electrical tacho generator system uses

#18. Where very accurate temperature indication is required the indicator used will be.

#19. Total Air Temperature (TAT) is equal to:

#20. The principle of the fuel-monitoring device giving the fuel burnt is:

#21. To measure the fuel quantity on a heavy aircraft we use: 1 capacitor gauges 2 electric gauges with round floats 3 the indication can directly be indicated as a mass 4 the indication can not be indicated as a mass The combination of all correct statements is

#23. The capacitor gauge principle is based on:

#24. Among the following parameters: EGT EPR FF N1 N2 Oil pressure Fuel pressure The ones that can be used to monitor a gas turbine thrust setting are:

#25. The most significant parameters and the most important that express the thrust of a gas turbine engine are;

#26. On a modern twin spool turbofan, the main handling parameter is:

#27. Two main indications used to evaluate a turbojet thrust are:

#28. The measure of a torque can be made by measuring:

#29. Among these instruments, which one uses aneroid capsules?

#31. The working principle of mass flow meters mostly used now days, is to measure in their system:

#32. The advantage of a ratiometer is

#33. What is a synchroscope used for

#34. On an EICAS display what does the yellow arc on the temperature gauge signify

#35. An RPM gauge has a red line at the upper end of the green arc, in the middle of the green arc is a smaller red arc. What is the significance of this smaller red arc

#36. In an ECAM system if a caution message appears the system will

#37. A cylinder head temperature measuring system in a piston engine has a sensor

#38. The principles used in an electrical RPM indicating system are:- 1. Tacho probe and phonic wheel 2. DC generator producing AC 3. 3 phase AC generator driving a 3 phase AC motor 4. Single phase AC generator driving a single phase AC motor

#39. What does the yellow band on an EICAS generated engine gauge indicate?

#40. Advantage of a ratiometer type measuring circuit is

#41. In a Turbojet thrust is measured by

#42. How will a system failure warning be shown to the pilot in the ECAM system

#43. What is used to measure gas turbine inlet pressure

#44. What does a bourdon tube measure

#45. What are the disadvantages of an electrical float fuel quantity measuring system 1 Attitude 2 Acceleration 3 Temperature 4 Ambient pressure 5 Needs an AC power supply

#46. What are the disadvantages of an electrical float fuel quantity measuring system 1 Attitude 2 Acceleration 3 Temperature 4 Ambient pressure 5 Needs an AC power supply

#47. How can temperature be measured 1. Resistance 2. Mercury 3. Thermocouple 4. Reactance

#48. A Thermocouple would normally be used to measure the temperature of the:

#49. The Bourdon Tube is used in:

#50. The principle upon which flowmeters (mass flow) most commonly used today work, is to measure:

#51. A small turbine placed in the flow of fuel to the burners of a Gas Turbine engine measures:

#52. The torquemeter is an instrument:

#53. Torque can be calculated in a torquemeter system by the measurement: