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CPL Test Series
Question Bank
Questions for KW ENGINE MONITORING
Answer the following questions
Test Mode
Training Mode
1. Turbine outlet pressure is detected by?
Aneroid capsule.
Bellows.
Bourden tube.
Differential capsule.
2. The disadvantages of a single-phase A.C. generator tachometer are: 1. The pressure of spurious signals due to D.C. generator commutator. 2. The importance of line resistance on the information value. 3. The influence of temperature on the techometer information. The combination regrouping all the correct statements is?
1, 2.
2.
1, 2, 3.
1, 3.
3. A millivolmeter measuring the electromotive force between the "hot junction " and the "cold junction" of a thermocouple can be directly gradusted 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.
4. The probe used to measure the air intake pressure of a gas turbine engined powerplant is?
A Bourdon tube.
An anerold capsule.
A bellows sensor.
A differential capsule.
5. The pressure probe used to measure the pressure of a low pressure fuel pump is?
A Bourdon tube.
A bellows sensor.
An anerold capsule.
A differential capsule.
6. Vibration sensors on a turbofan engine are typically located?
Radially pointing on the fan and turbine casings.
On the HP spool and by-pass duct.
On the gearboxes and output shafts.
Longitudinally pointing, on the fan and turbine casings.
7. A synchroscope is used on aircraft to?
Reduce the rpm of each engine.
Reduce the vibration of each engine.
Achieve optimum control of on-board voltages.
Set several engines to the same speed.
8. Vibration is measured using? 1. Accelerometers. 2. Pieza crystals. 3. Inductive coils. 4. Capacitive elements. 5. Strain gauges.
3, 4, 5.
2, 3, 4, 5.
1, 2, 3, 4.
1, 2, 3.
9. Cylinder head temperature on a piston engine is measured using a _________ on the ________?
Resistive element hottest cylinder.
Thermocouple hottest cylinder.
Thermocouple coolest cylinder.
Resistive element exhaust manifold.
10. On an aeroplane equipped with a constant speed propeller, the RPM indicator enables?
On a twin-engine aeroplane, automatic engine synchronisation.
Control of the propeller regulator and the display of propeller RPM.
Selection of engine RPM.
Control of power.
11. If the EPR gauge over reads during the take-off run?
There is a danger that the aircraft will fall to take-off safely.
Climb performance will be improved.
The engines will not start.
The engine will exceed its limiting pressures and teperatures.
12. Where is EGT measured?
At the LP turbine inlet.
At the LP turbine outlet.
At the HP turbine inlet.
At the HP turbine outlet.
13. The operating principle of an "electronic" 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.
14. The squirrel cage tachometer employs?
A three phase AC generator producing a voltage proportional to RPM.
External AC power supply modified by the speed sensor.
A three phase AC generator producing a signal frequency proportional to RPM.
External DC power supply modified by the speed sensor.
15. Thermocouples are?
Two dissimilar metals separated by a dielectric material.
Two dissimilar metals connected at one point.
Two similar metals connect at two points.
Two dissimilar metals connected at two points.
16. The squirrel cage motor in a tacho-Indicator?
Is driven directly by the engine.
Is driven by three phase AC current from a tacho-generator driven by the engine.
Is driven by the output from a DC tacho-generator driven by the engine.
Drives the indicator needle directly.
17. What does the amber are on an EGT gauge indicate?
Maximum EGT for normal operations.
Mass limited EGT.
Time limited EGT.
Altitude limited EGT.
18. The transmitter of RPM indicator may consist of: 1. A magnetic senor supplying an inducted AC voltage. 2. A DC generator supplying a DC voltage. 3. A single-phase AC generator supplying an AC voltage. 4. A three-phase AC generator supplying a three-phase voltage. The combination of correct statements is?
1, 4.
1, 2, 3, 4.
2, 3, 4.
1, 2, 3.
19. The operating principle of the "Induction" type of tachometer is to measure the?
Frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
Magnetic field produced by a dynamo or an alternator.
Rotation speed of an asynchronous motor energized by an alternator.
Electromotive force (EMF) produced by a dynamo or an alternator.
20. Temperature is measured in aircraft engine by means of? 1. Thermocouples, 2. Mercury. 3. Resistive elements. 4. Capacitive elements.
3, 4.
1, 2.
2, 3.
1, 3.
21. A synchroscope is used to?
To ensure that AC generators are properly synchronised before coupling.
To indicate RPM difference between engines in multi prop aircraft.
Coordinate the RPM of the high a low speed on turbofans.
Coordinate fan RPMs in multi turbofan aircraft.
22. Which of the following is used to measure temperature? 1. The seebeck effect. 2. the variation of electrical resistance with changes in temperature. 3. The variation of capacitance with changes in temperature. 4. Thermal expansion of liquids and solids.
1, 2, 4.
1, 2, 3.
1, 3, 4.
1, 4, 3.
23. Arrange the following sensors in increasing order of the pressures they would be used to sense? 1. Capsule, 2. Bellows. 3. Bourden tube.
1, 2, 3.
1, 3, 2.
2, 3, 1.
3, 1, 2.
24. Jet engine exhaust gas temperature is measured using?
A thermistor.
A thermocouple.
A number of thermocouples connected in series.
A number of thermocouples connected in parallel.
25. The advantage 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, 3.
2, 3.
1, 2.
26. A full Authority Digital Engine Control (FADEC) has the following functions : 1. Flow regulation (fuel, decelerations and accelerations monitoring). 2. Automatic starting sequence. 3. Transmissions of engine data to the pilot's instruments. 4. Thrust management and protection of operation limits. 5. Monitoring of the thrust reversers. The combination regrouping all the correct statement is?
2, 4, 5.
1, 3, 4, 5.
1, 3, 5.
1, 2, 3, 4, 5.
27. The green sector of the arc of a temperature gauge corresponds to?
A normal operating range.
An exceptional operating range.
A forbidden operating range.
A special operating range.
28. Typical vibration sensors include? 1. Inductive coils. 2. Phonic wheels.3. Magnetometers. 4. Piezo crystals.
2, 4.
1, 4.
1, 3, 4.
1, 2, 4.
29. The sensors used to measure the exhaust gas temperature on an aircraft equipped with turbojets are?
Thermosouples.
Based on metallic conductors whose resistance Increase linearly with temperature.
Capacitors whose capacity varies proportionally with temperature.
Based on metallic parts whose expansion/contraction is measured.
30. The electronic tachometer sensor is composed of?
A circular magnet with four poles.
The rotor of a single phase A.C. generator.
A notched wheel rotating in front of an electro-magnet.
The rotor of a three phase A.C. generator.
31. A millimetric voltmeter measuring the PD across the hot and cold junctions of a thermocouple, can be calibrated to indicate temperature by?
The cold junction temperature is known.
The cold junction is kept at a constant temperature.
The cold junction is kept at absolute zero.
The cold junction is kept a zero degree Celsius.
32. 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.
33. A capsule stack would be used to measure ___________ pressure when a ________ mechanical output for a given pressure change was required?
Low large.
High small.
High large.
Low small.
34. If one of the probes in a typical gas turbine engine EGT system becomes defective, the indications would be?
Too high.
Lost.
Too low.
Not significantly affected.
35. The temperature measured by the CHT (Cylinder Head temperature) probe is The?
Average temperature within the whole set of cylinders.
Temperature of the exhaust gases.
Temperature of the carburetor 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.
36. If a manifold pressure gauge consistently registers atmospheric pressure, the cause is probably?
Ice in Induction system.
Leak in pressure gauge line.
Fuel of too low volatility.
Too high float level.
37. A vibration monitoring system used ______ to measure ______ filters out unwanted _______, then indicates ________, to the pilot?
Thermisters, radial movement, frequencies, absolute amplitude.
Accelerometers, axial movement, noise, relative amplltude.
Accelerometers, radial movement, frequencies and noise, relative amplitude.
Radiometers, radial movement, frequencles, absolute frequency.
38. A system which measures both torque and engine RPM employs?
A phonic wheel and a tacho-generator. The phonic wheel detects torque and the tacho-generator detects RPM.
A tacho-generator at each end of the output shaft, coupled to a device which measures frequency and phase difference between the two output signals.
A phonic wheel at each end of the output shaft, coupled to a device which measures frequency and voltage differences between the two outputs.
A phonic wheel at each end of the output shaft, coupled to a device which measures frequency and phase difference between the two outputs.
39. A cylinder head temperature gauge measures?
The hottest cylinder only.
All of the cylinders and averages the result.
All of the cylinders and sums the result.
The coolest cylinder only to preserve the sensor.
40. An engine vibration monitoring system employs?
Amplitude filters and thermistors.
Frequency filters and capacitors.
Amplitude filters and amplifiers.
Frequency filters and amplifiers.
41. Torque can be determined by measuring the?
Phase difference between 2 impulse tachometers attached to a transmission shaft.
Quantity of light passing through a rack-wheel attached to a transmission shaft.
Oil pressure at the fixed crown of an epicycloidal reducer of the main engine gearbox.
Frequency of an impulse tachometer attached to a transmission shaft.
42. Different pressure sensor 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 type. 2. Bourdon tube type. 3. Aneroid capsule type.
1, 2, 3.
3, 2, 1.
3, 1, 2.
2, 1, 3.
43. In an engine vibration monitoring system for a turbojet any vibration produced by the engine is?
Directly proportional to engine speed.
Inversely proportional to engine speed.
Fed directly to the cockpit Indicator without amplification or filtering.
Amplified and filtered before fed to the cockpit indicator.
44. A vibration indicator receives a signal from different sensors
Acceleration measured by the sensors, expressed in g.
Vibration amplitude at a given frequency.
Vibration period expressed in seconds.
Vibration frequency expressed in Hz.
45. The main advantage of a ratiometer-type temperature Indicator is that it?
Is simple.
Carries out an Independent measurement of the supply voltage.
Is very accurate.
Can operate without an electrical power supply.
46. If a remote sensing pressure measurement system uses a ratiometer rather than an ammeter as its indicator, it will be?
More sensitive to line resistance changes.
Less sensitive to line resistance changes.
Not affected by line resistance changes.
Rendered unservicrable by line resistance changes.
47. A vibration meter indicates?
Period.
Relative amplitude.
Frequency.
Pitch.
48. What does the vibration measuring system indicate to the pilot?
Relative frequency.
Absolute frequency.
Absolute magnitude.
Relative amplitude.
49. The Engine Pressure Ratio (EPR) is computed by?
Multiplying compressor Inlet pressure by turbine discharge pressure.
Multiplying compressor discharge pressure by turbine Inlet pressure.
Dividing turbine discharge pressure by compressor inlet pressure.
Dividing compressor discharge pressure by turbine discharge pressure.
50. The speed of rotation of the motor in a tacho-indicator is?
Constant.
Proportional to tacho-generator output frequency.
Proportional to tacho-generator output current.
Proportional to tacho-generator output voltage.
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