Email
info@vayudootaviation.com
Phone No
+91 7276526726
become a pilot
Home
About us
courses
CPL
ATPL
RTR(A)
Airline Cadet Program
IGRUA Entrance Prep
B.Sc. Aviation
Pilot Training
INDIA
USA
CANADA
SOUTH AFRICA
NEW ZEALAND
EUROPE
Aircraft Type-Rating
Airbus A320
Boeing 737
Blogs
contact
CPL Test Series
Question Bank
Questions for KW ENGINE MONITORING
Answer the following questions
Test Mode
Training Mode
1. On what principles does a vibration meter work?
Accelerometers, frequency filters and amplifiers.
High frequency, low amplitude.
Accelerometers, amplitude filters, and comparators.
Dynamometers, frequency filters and amplifiers.
2. 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 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.
A phonic wheel at each end of the output shaft, coupled to a device which measures frequency and phase difference between the two outputs.
3. The probe used to measure the air intake pressure of a gas turbine engined powerplant is?
A bellows sensor.
A differential capsule.
A Bourdon tube.
An anerold capsule.
4. A mainfoid pressure gauge of piston engine measures?
Fuel pressure leaving the carburettor.
Absolute pressure in intake system near the inlet valve.
Vacuum in the carburettor.
Absolute air pressure entering the carburettor.
5. Torque in a turbo-prop engine is indicated in? 1. Newton meters. 2. %. 3. PSI. 4. EPR. 5. Lbf ft.
1, 2, 3, 4.
2, 3, 4, 5.
1, 3, 4, 5.
1, 2, 3, 5.
6. The electronic tachometer sensor is composed of?
A circular magnet with four poles.
The rotor of a single phase A.C. generator.
The rotor of a three phase A.C. generator.
A notched wheel rotating in front of an electro-magnet.
7. 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.
3, 1, 2.
3, 2, 1.
1, 2, 3.
8. 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.
9. 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.
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.
10. The Engine Pressure Ratio (EPR) is computed by?
Dividing turbine discharge pressure by compressor inlet pressure.
Multiplying compressor Inlet pressure by turbine discharge pressure.
Multiplying compressor discharge pressure by turbine Inlet pressure.
Dividing compressor discharge pressure by turbine discharge pressure.
11. The pointer that aligns with the red line on a EGT gauge?
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.
Is adjustable to permit different limits to be set as required.
12. The green sector of the arc of a temperature gauge corresponds to?
A special operating range.
An exceptional operating range.
A normal operating range.
A forbidden operating range.
13. What type of sensor is employed to measure compressor air inlet temperature in a typical turbojet engine fuel system?
Alcohol thermometer.
Optical pyrometer.
Temperature probe.
Mercury thermometer.
14. If one of the probes in a typical gas turbine engine EGT system becomes defective, the indications would be?
Not significantly affected.
Too high.
Lost.
Too low.
15. Temperature is measured in aircraft engine by means of? 1. Thermocouples, 2. Mercury. 3. Resistive elements. 4. Capacitive elements.
2, 3.
1, 3.
1, 2.
3, 4.
16. Arrange the following sensors in increasing order of the pressures they would be used to sense? 1. Capsule, 2. Bellows. 3. Bourden tube.
3, 1, 2.
1, 2, 3.
1, 3, 2.
2, 3, 1.
17. If a manifold pressure gauge consistently registers atmospheric pressure, the cause is probably?
Fuel of too low volatility.
Leak in pressure gauge line.
Too high float level.
Ice in Induction system.
18. 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 hot junction above 15 degrees Celsius.
By keeping the cold junction at a constant temperature.
By protecting the hot junction from high temperatures.
19. Cylinder head temperature measurement system typically work on the _________ principle?
Capacitive
Thermocouple.
Resistive.
Thermal expansion (bi-meta strip).
20. EPR is calculated by?
Dividing compressor inlet pressure by HP turbine outlet pressure.
Subtracting LP compressor inlet pressure from JP turbine outlet pressure.
Diving LP turbine outlet pressure by LP compressor inlet pressure.
Diving HP turbine outlet pressure by air inlet pressure.
21. The RPM Indicator (or tachometer) of a piston engine can Include a small red are within the arc normally used (green arc). In the RPM range corresponding to this small red arc the?
Rating is the maximum possible in continuous mode.
Propeller generates vibration, continuous rating is forbidden.
Is minimum at this rating.
Rating is the minimum usable in cruise propeller efficiency.
22. In an engine vibration monitoring system for a turbojet any vibration produced by the engine is?
Directly proportional to engine speed.
Fed directly to the cockpit Indicator without amplification or filtering.
Inversely proportional to engine speed.
Amplified and filtered before fed to the cockpit indicator.
23. A remote sensing pressure gauging system measuring low pressures, typically employs a ________ to move _________ The variation in ________ are then measured using a _________ or ___________?
Aneroid capsule, capacitor, capacitance, wheatstone bridge, ratiometer.
Bourden tube, variometer, capacitance, transistor, capacitor.
Differential capsule, ratiometer, current, capacitor, ammeter.
Bellows, variable resister, resistance, wheatstone bridge, ratiometer.
24. Where is EGT measured?
In the combustion chamber.
At the turbine inlet.
At the turbine outlet.
In the jet pipe.
25. 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 a zero degree Celsius.
The cold junction is kept at absolute zero.
26. What type of sensors are typically used to measure engine oil temperature?
Reactive probes.
Thermocouples.
Capacitive probes.
Resistive probes.
27. 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, 3.
1, 2, 3.
28. 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 is a simple voltmeter with a rev/min scale measuring an AC voltage varying with the 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 converts the signal into pulses which are then counted.
The indicator is provided with a motor which drives a magnetic tachometer a DC voltage varying with the RPM.
29. The electrical supply for a basic thermocouple system is?
Self generated by the inductive reactance method.
Provided from the essential services busbar.
Self generated by the SEEBECK effect.
Provided by a dedicated transformer.
30. Typical vibration sensors include? 1. Inductive coils. 2. Phonic wheels.3. Magnetometers. 4. Piezo crystals.
1, 4.
1, 2, 4.
1, 3, 4.
2, 4.
31. 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, 2, 3, 4, 5.
1, 3, 5.
32. 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?
Ambient static plus 10 PSI.
50 inches Hg.
10 PSI.
30 Inches Hg.
33. 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, 2.
3, 5.
2, 5.
1, 4.
34. Which of the following is least affected by variation in power supply voltage?
Variometers.
Rheostats.
Galvanometers
Ratiometers.
35. 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 constant.
Cold junction is maintained at 15° C.
Cold junction is maintained constant.
Hot junction is maintained at 15° C.
36. Vibration meters measure?
Period in seconds.
Frequency in Hz.
Accelerations in g.
Amplitude at a given frequency.
37. 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.
38. The advantages of single-phase A.C. generator tachometer are: 1. The suppression of spurious signal due to a D.C. generator commutator. 2. The importance of line resistance on the information value. 3. The independence of the information in relation to the airborne electrical power supply. 4. The ease of transmission of the information. The combination regrouping all the correct statement is?
1, 2, 3, 4.
2, 3, 4.
2, 4.
1, 3.
39. Cylinder head temperature on a piston engine is measured using a _________ on the ________?
Resistive element hottest cylinder.
Resistive element exhaust manifold.
Thermocouple hottest cylinder.
Thermocouple coolest cylinder.
40. Torque can be determined by measuring the?
Frequency of an impulse tachometer attached to a transmission shaft.
Quantity of light passing through a rack-wheel attached to a transmission shaft.
Phase difference between 2 impulse tachometers attached to a transmission shaft.
Oil pressure at the fixed crown of an epicycloidal reducer of the main engine gearbox.
41. 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.
42. A capsule stack would be used to measure ___________ pressure when a ________ mechanical output for a given pressure change was required?
High small.
High large.
Low large.
Low small.
43. 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?
2, 3, 4.
1, 2, 4.
1, 3, 4.
1, 2, 3, 4.
44. 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 measuring an AC voltage, The frequency of which varies with the RPM.
The indicator is provided with a motor, which drives a magnetic tachometer.
The indicaor converts the signal into square pulses which are the counted as an AC voltage varying with the RPM.
The indicator rectifies the signal via a diode bridge and is provided with a voltmeter a three-phase voltage, the frequency of which varies with the RPM.
45. What does the amber are on an EGT gauge indicate?
Time limited EGT.
Mass limited EGT.
Maximum EGT for normal operations.
Altitude limited EGT.
46. 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?
Resistive.
Bi-metalic.
Liquid expansion.
Capacitive.
47. A thermocouple type themometer consists of?
A Wheatstone bridge connected to a voltage indicator.
Two metal conductors of the same type connected at two points.
A single-wire metal winding.
Two metal conductors of different type connected at one point.
48. 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.
Not affected by line resistance changes.
Rendered unservicrable by line resistance changes.
More sensitive to line resistance changes.
49. Turbine outlet pressure is detected by?
Bellows.
Aneroid capsule.
Differential capsule.
Bourden tube.
50. The two main sources of information used to calculate turbojet thrust are the?
High pressure turbine rotation speed or the EPR (Engine Pressure Ratio).
Fan rotation speed (or N1) or the total pressure at the low pressure turbine outlet.
Fan rotation speed (or N1) or the total pressure at the high pressure compressor outlet.
Fan rotation speed (or N1) or the EPR (Engine Pressure Ratio).
Submit
Make New Set