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CPL Test Series
Question Bank
Questions for KW ENGINE MONITORING
Answer the following questions
Test Mode
Training Mode
1. 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, 2, 3.
2, 3, 4.
1, 2, 3, 4.
1, 4.
2. 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, 3, 4.
1, 2, 4.
1, 4, 3.
1, 2, 3.
3. Thermocouples are?
Two similar metals connect at two points.
Two dissimilar metals separated by a dielectric material.
Two dissimilar metals connected at two points.
Two dissimilar metals connected at one point.
4. Typical vibration sensors include? 1. Inductive coils. 2. Phonic wheels.3. Magnetometers. 4. Piezo crystals.
1, 4.
2, 4.
1, 3, 4.
1, 2, 4.
5. EPR is calculated by?
Dividing compressor inlet pressure by HP turbine outlet pressure.
Diving LP turbine outlet pressure by LP compressor inlet pressure.
Diving HP turbine outlet pressure by air inlet pressure.
Subtracting LP compressor inlet pressure from JP turbine outlet pressure.
6. A vibration indicator receives a signal from different sensors
Vibration period expressed in seconds.
Vibration frequency expressed in Hz.
Acceleration measured by the sensors, expressed in g.
Vibration amplitude at a given frequency.
7. The squirrel cage motor in a tacho-Indicator?
Is driven directly by the engine.
Is driven by the output from a DC tacho-generator driven by the engine.
Drives the indicator needle directly.
Is driven by three phase AC current from a tacho-generator driven by the engine.
8. Where is EGT measured?
At the HP turbine outlet.
At the LP turbine inlet.
At the HP turbine inlet.
At the LP turbine outlet.
9. The Engine Pressure Ratio (EPR) is computed by?
Multiplying compressor discharge pressure by turbine Inlet pressure.
Dividing turbine discharge pressure by compressor inlet pressure.
Dividing compressor discharge pressure by turbine discharge pressure.
Multiplying compressor Inlet pressure by turbine discharge pressure.
10. Vibration is measured using? 1. Accelerometers. 2. Pieza crystals. 3. Inductive coils. 4. Capacitive elements. 5. Strain gauges.
1, 2, 3.
3, 4, 5.
1, 2, 3, 4.
2, 3, 4, 5.
11. The red pointer which is normally on the red line on the EGT (Exhaust Gas Temperature) indicators?
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.
Allows the display of the parameter value to be adopted during take-off.
Shows the vibration level of the engine under consideration.
12. 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.
13. If a ratiometer is used in the indicator of temperature measuring system rather than an ameter?
It will be more affected by line resistance losses.
It will be ineffective due to line resistance losses.
It will always give accurate readings, regardless of line resistance losses.
It will be less affected by line resistance losses.
14. A synchroscope is used on aircraft to?
Reduce the rpm of each engine.
Achieve optimum control of on-board voltages.
Reduce the vibration of each engine.
Set several engines to the same speed.
15. The operating principle of an "electronic" tachometer is to measure the?
Magnetic field produced by a dynamo or an alternator.
Electromotive force (EMF) produced by a dynamo or an alternator.
Frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
Rotation speed of an asynchronous motor energized by an alternator.
16. If a remote sensing pressure measurement system uses a ratiometer rather than an ammeter as its indicator, it will be?
Rendered unservicrable by line resistance changes.
Not affected by line resistance changes.
More sensitive to line resistance changes.
Less sensitive to line resistance changes.
17. 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?
Hot junction is maintained at 15° C.
Cold junction is maintained constant.
Cold junction is maintained at 15° C.
Hot junction is maintained constant.
18. 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 is kept a zero degree Celsius.
The cold junction is kept at a constant temperature.
The cold junction is kept at absolute zero.
The cold junction temperature is known.
19. 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.
20. A tacho-generator RPM measuring system employs?
A single phase AC generator, the frequency of which varies with engine RPM, and is fed to a single phase sychronous motor driving a drag cup in the indicator.
A DC motor, the frequency of which varies with engine RPM and is fed to a DC motor in the Indicator.
A three phase AC generator, the frequency of which varies with engine RPM, and is fed to a synchronous motor driving a drag cup in the indicator.
A phonic wheel producing an AC signal, the frequency of which is fed to a synchronous motor in the indicator.
21. A synchroscope is used to?
To indicate RPM difference between engines in multi prop aircraft.
To ensure that AC generators are properly synchronised before coupling.
Coordinate fan RPMs in multi turbofan aircraft.
Coordinate the RPM of the high a low speed on turbofans.
22. The signal supplied by a transmitter fitted with a magnetic sensor, connected to an RPM indicator is a three-phase voltage frequency varies with RPM?
The indicator rectifies the signal via a diode bridge and is provided with a voltmeter measuring an AC voltage, the frequency of which varies with the RPM.
The indicator is provided with a motor which drives a magnetic tachometer a DC voltage varying with the RPM.
The indicator converts the signal into pulses which are then counted.
The indicator is a simple voltmeter with a rev/min scale measuring an AC voltage varying with the RPM?
23. To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle?
Bi-metallic strip.
Thermocouple.
Gas pressure.
Liquid expansion.
24. The yellow sector of the temperature gauge corresponds to?
A normal operating range.
An exceptional operating range.
A forbidden operating range.
A frequent operating range.
25. The pointer that aligns with the red line on a EGT gauge?
Is adjustable to permit different limits to be set as required.
Is adjustable to permit higher limits to be set when taking-off at high mass in high mablent temperatures.
Indicates maximum temperature.
Is movable and indicates maximum temperature exceeding the red line.
26. Which of the following is least affected by variation in power supply voltage?
Ratiometers.
Variometers.
Rheostats.
Galvanometers
27. A remote sensing pressure gauging system measuring low pressures, typically employs a ________ to move _________ The variation in ________ are then measured using a _________ or ___________?
Differential capsule, ratiometer, current, capacitor, ammeter.
Aneroid capsule, capacitor, capacitance, wheatstone bridge, ratiometer.
Bourden tube, variometer, capacitance, transistor, capacitor.
Bellows, variable resister, resistance, wheatstone bridge, ratiometer.
28. What type of sensor is employed to measure compressor air inlet temperature in a typical turbojet engine fuel system?
Temperature probe.
Mercury thermometer.
Optical pyrometer.
Alcohol thermometer.
29. The operating principle of the "Induction" type of tachometer is to measure the?
Magnetic field produced by a dynamo or an alternator.
Electromotive force (EMF) produced by a dynamo or an alternator.
Frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
Rotation speed of an asynchronous motor energized by an alternator.
30. If one of the probes in a typical gas turbine engine EGT system becomes defective, the indications would be?
Lost.
Too low.
Not significantly affected.
Too high.
31. 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.
32. A vibration meter indicates?
Period.
Pitch.
Frequency.
Relative amplitude.
33. Cylinder head temperature on a piston engine is measured using a _________ on the ________?
Resistive element hottest cylinder.
Thermocouple coolest cylinder.
Thermocouple hottest cylinder.
Resistive element exhaust manifold.
34. What type of sensors are typically used to measure engine oil temperature?
Thermocouples.
Reactive probes.
Resistive probes.
Capacitive probes.
35. A capsule stack would be used to measure ___________ pressure when a ________ mechanical output for a given pressure change was required?
High large.
Low small.
High small.
Low large.
36. Vibration sensors on a turbofan engine are typically located?
Radially pointing on the fan and turbine casings.
On the gearboxes and output shafts.
On the HP spool and by-pass duct.
Longitudinally pointing, on the fan and turbine casings.
37. What does the amber are on an EGT gauge indicate?
Mass limited EGT.
Maximum EGT for normal operations.
Altitude limited EGT.
Time limited EGT.
38. Torque in a turbo-prop engine is indicated in? 1. Newton meters. 2. %. 3. PSI. 4. EPR. 5. Lbf ft.
2, 3, 4, 5.
1, 2, 3, 4.
1, 2, 3, 5.
1, 3, 4, 5.
39. A cylinder head temperature gauge measures?
All of the cylinders and sums the result.
All of the cylinders and averages the result.
The coolest cylinder only to preserve the sensor.
The hottest cylinder only.
40. The speed of rotation of the motor in a tacho-indicator is?
Proportional to tacho-generator output current.
Constant.
Proportional to tacho-generator output frequency.
Proportional to tacho-generator output voltage.
41. What type of sensor is typically used to measure lubricating oil temperature in a turbojet engine?
Resistive probe.
Thermocouples probe.
Capacitive probe.
Bi-metal strip.
42. Turbo-prop engine torque is commonly measured using? 1. Rotary hydraulic systems. 2. Axial hydraulic systems. 3. Strain gauges. 4. Phase shifting phonic wheel systems
1, 2, 3.
All of the above.
2, 3, 4.
1. 3, 4.
43. The measurement of the turbine temperature or of the EGT (Exhaust Gas Temperature) is carried out at the?
High pressure chamber intake.
Combustion chamber outlet.
Combustion chamber intake.
High pressure turbine outlet.
44. What is a bellows used to measure?
Low pressures.
Low temperatures.
Density.
High pressures.
45. The squirrel cage tachometer employs?
A three phase AC generator producing a signal frequency proportional to RPM.
External AC power supply modified by the speed sensor.
External DC power supply modified by the speed sensor.
A three phase AC generator producing a voltage proportional to RPM.
46. An engine vibration monitoring system employs?
Amplitude filters and amplifiers.
Amplitude filters and thermistors.
Frequency filters and capacitors.
Frequency filters and amplifiers.
47. A mainfoid pressure gauge of piston engine measures?
Vacuum in the carburettor.
Fuel pressure leaving the carburettor.
Absolute air pressure entering the carburettor.
Absolute pressure in intake system near the inlet valve.
48. In order to measure temperature the cylinder had temperature (CHT) gauge utillses a?
Thermocouple consisting of two dissimilar metals.
Bourdon tube.
Wheatstone bridge circuit.
Ratiometer circult.
49. On an aeroplane equipped with a constant speed propeller, the RPM indicator enables?
On a twin-engine aeroplane, automatic engine synchronisation.
Selection of engine RPM.
Control of the propeller regulator and the display of propeller RPM.
Control of power.
50. 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, 3.
2, 3.
1, 2, 3.
1, 2.
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