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CPL Test Series
Question Bank
Questions for KW ENGINE MONITORING
Answer the following questions
Test Mode
Training Mode
1. Arrange the following sensors in increasing order of the pressures they would be used to sense? 1. Capsule, 2. Bellows. 3. Bourden tube.
2, 3, 1.
1, 2, 3.
1, 3, 2.
3, 1, 2.
2. The main advantage of a ratiometer-type temperature Indicator is that it?
Is simple.
Carries out an Independent measurement of the supply voltage.
Can operate without an electrical power supply.
Is very accurate.
3. A vibration monitoring system used ______ to measure ______ filters out unwanted _______, then indicates ________, to the pilot?
Accelerometers, axial movement, noise, relative amplltude.
Thermisters, radial movement, frequencies, absolute amplitude.
Accelerometers, radial movement, frequencies and noise, relative amplitude.
Radiometers, radial movement, frequencles, absolute frequency.
4. In order to measure temperature the cylinder had temperature (CHT) gauge utillses a?
Wheatstone bridge circuit.
Bourdon tube.
Ratiometer circult.
Thermocouple consisting of two dissimilar metals.
5. 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.
6. The yellow sector of the temperature gauge corresponds to?
An exceptional operating range.
A normal operating range.
A forbidden operating range.
A frequent operating range.
7. 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.
Bourden tube, variometer, capacitance, transistor, capacitor.
Bellows, variable resister, resistance, wheatstone bridge, ratiometer.
Aneroid capsule, capacitor, capacitance, wheatstone bridge, ratiometer.
8. 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.
9. The electrical supply for a basic thermocouple system is?
Provided by a dedicated transformer.
Provided from the essential services busbar.
Self generated by the SEEBECK effect.
Self generated by the inductive reactance method.
10. A tacho-generator RPM measuring system employs?
A DC motor, the frequency of which varies with engine RPM and is fed to a DC motor in the Indicator.
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 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.
11. The operating principle of the "Induction" type of tachometer is to measure the?
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.
Frequency of the electric impulse created by a notched wheel rotating in a magnetic field.
12. 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, 3.
1, 2, 4.
1, 4, 3.
13. If one of the probes in a typical gas turbine engine EGT system becomes defective, the indications would be?
Too low.
Too high.
Not significantly affected.
Lost.
14. Vibration is measured using? 1. Accelerometers. 2. Pieza crystals. 3. Inductive coils. 4. Capacitive elements. 5. Strain gauges.
1, 2, 3, 4.
2, 3, 4, 5.
3, 4, 5.
1, 2, 3.
15. A temperature gauging system employing thermocouples can be graduated to indicated temperature by?
By keeping the cold junction at 15 degrees Celsius.
By keeping the cold junction at a constant temperature.
By protecting the hot junction from high temperatures.
By keeping the hot junction above 15 degrees Celsius.
16. What type of sensor is normally used to measure inlet air temperature where the signal is to be employed for altitude compensation in a conventional (non FADEC) engine fuel system?
Bi-metalic.
Capacitive.
Liquid expansion.
Resistive.
17. A synchroscope is used on aircraft to?
Achieve optimum control of on-board voltages.
Set several engines to the same speed.
Reduce the rpm of each engine.
Reduce the vibration of each engine.
18. The operating principle of an "electronic" tachometer is to measure the?
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.
Rotation speed of an asynchronous motor energized by an alternator.
Magnetic field produced by a dynamo or an alternator.
19. To permit turbine exit temperatures to be measured, gas turbines are equipped with thermometers which work on the following principle?
Thermocouple.
Gas pressure.
Bi-metallic strip.
Liquid expansion.
20. 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.
1, 3.
2.
1, 2, 3.
21. EPR is calculated by?
Subtracting LP compressor inlet pressure from JP turbine outlet pressure.
Diving HP turbine outlet pressure by air inlet pressure.
Diving LP turbine outlet pressure by LP compressor inlet pressure.
Dividing compressor inlet pressure by HP turbine outlet pressure.
22. A system which measures both torque and engine RPM employs?
A phonic wheel at each end of the output shaft, coupled to a device which measures frequency and phase difference between the two outputs.
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 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 and a tacho-generator. The phonic wheel detects torque and the tacho-generator detects RPM.
23. Cylinder head temperature on a piston engine is measured using a _________ on the ________?
Thermocouple coolest cylinder.
Resistive element hottest cylinder.
Resistive element exhaust manifold.
Thermocouple hottest cylinder.
24. A turbocharged piston has a rated boost of 10 PSI and critical altitude of 15000 ft amsl ISA. If the aircraft is at a pressure altitude of 10000 ft climbing at rated power, what will be is its MAP?
50 inches Hg.
10 PSI.
30 Inches Hg.
Ambient static plus 10 PSI.
25. An engine vibration monitoring system employs?
Amplitude filters and thermistors.
Frequency filters and capacitors.
Frequency filters and amplifiers.
Amplitude filters and amplifiers.
26. 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.
2, 1, 3.
1, 2, 3.
3, 1, 2.
3, 2, 1.
27. 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 always give accurate readings, regardless of line resistance losses.
It will be ineffective due to line resistance losses.
It will be less affected by line resistance losses.
28. 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 vibration level of the engine under consideration.
Shows the limit value not to be exceeded.
Allows the display of the parameter value to be adopted during take-off.
29. 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.
30. A synchroscope is used to?
To indicate RPM difference between engines in multi prop aircraft.
Coordinate the RPM of the high a low speed on turbofans.
To ensure that AC generators are properly synchronised before coupling.
Coordinate fan RPMs in multi turbofan aircraft.
31. What is a bellows used to measure?
Density.
High pressures.
Low temperatures.
Low pressures.
32. 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.
33. The advantages of an electrical induction tachometer are: 1. The display is not sensitive to line resistance. 2. The measurement is independent of aircraft power supply. 3. The measurement is independent of temperature variations. 4. The option to use without restriction several Indicators connected in parallel to a single transmitter. The combination regrouping all the correct statements is?
1, 3, 4.
2, 3, 4.
1, 2, 4.
1, 2, 3, 4.
34. Where is EGT measured?
At the turbine inlet.
In the jet pipe.
At the turbine outlet.
In the combustion chamber.
35. A capsule stack would be used to measure ___________ pressure when a ________ mechanical output for a given pressure change was required?
High small.
Low large.
High large.
Low small.
36. What is EPR in a turbofan engine?
The ratio of combustion chamber pressure to compressor inlet pressure.
The ratio of the integrated mean of LP turbine outlet pressure plus fan outlet pressure to the fan inlet pressure.
The ratio to HP turbine outlet pressure to Hp compressor inlet pressure.
The ratio of compressor inlet pressure to turbine outlet pressure.
37. 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 converts the signal into pulses which are then counted.
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 is a simple voltmeter with a rev/min scale measuring an AC voltage varying with the RPM?
38. Cylinder head temperature measurement system typically work on the _________ principle?
Resistive.
Thermal expansion (bi-meta strip).
Capacitive
Thermocouple.
39. A vibration meter indicates?
Pitch.
Period.
Relative amplitude.
Frequency.
40. In a 3-phase synchronous motor type tachometer indicator : 1. The transmitter is a direct current generator. 2. The voltage is proportional to the transmitter drive speed. 3. The frequency is proportional to the transmitter drive speed. 4. The speed indicating element is a galvanometer. 5. The speed indicating elements is a synchronous motor driving a magnetic tachometer. The combination regrouping all the correct statements is?
1, 4.
2, 5.
3, 5.
1, 2.
41. A mainfoid pressure gauge of piston engine measures?
Absolute air pressure entering the carburettor.
Fuel pressure leaving the carburettor.
Vacuum in the carburettor.
Absolute pressure in intake system near the inlet valve.
42. The probe used to measure the air intake pressure of a gas turbine engined powerplant is?
An anerold capsule.
A bellows sensor.
A Bourdon tube.
A differential capsule.
43. What type of sensors are typically used to measure engine oil temperature?
Resistive probes.
Capacitive probes.
Thermocouples.
Reactive probes.
44. 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 absolute zero.
The cold junction temperature is known.
The cold junction is kept at a constant temperature.
45. The drag cup in a tacho-indicator?
Overcomes the effects of internal friction within the Indicator.
Converts rotary motion into limited angular displacement proportional to the variable being measured.
Converts AC input into rotary motion.
Converts limited angular motion into rotation.
46. Torque in a turbo-prop engine is indicated in? 1. Newton meters. 2. %. 3. PSI. 4. EPR. 5. Lbf ft.
1, 2, 3, 4.
1, 3, 4, 5.
1, 2, 3, 5.
2, 3, 4, 5.
47. If a remote sensing pressure measurement system uses a ratiometer rather than an ammeter as its indicator, it will be?
Less sensitive to line resistance changes.
More sensitive to line resistance changes.
Not affected by line resistance changes.
Rendered unservicrable by line resistance changes.
48. The Engine Pressure Ratio (EPR) is computed by?
Dividing compressor discharge pressure by turbine discharge pressure.
Multiplying compressor discharge pressure by turbine Inlet pressure.
Dividing turbine discharge pressure by compressor inlet pressure.
Multiplying compressor Inlet pressure by turbine discharge pressure.
49. Vibration meters measure?
Accelerations in g.
Period in seconds.
Frequency in Hz.
Amplitude at a given frequency.
50. What type of sensor is typically used to measure lubricating oil temperature in a turbojet engine?
Resistive probe.
Bi-metal strip.
Thermocouples probe.
Capacitive probe.
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