Results
Q1. The disadvantages of a single-phase A.C. generator tachometer are: 1- the presence of spurious signals due to a D.C. generator commutator 2- the importance of line resistance on the information value 3- the influence of temperature on the tachometer information The combination regrouping all the correct statements is:
2
Q2. A synchroscope is used on aircraft to:
set several engines to the same speed.
Q3. The electronic tachometer sensor is composed of:
a notched wheel rotating in front of an electro-magnet.
Q4. The signal supplied by a transmitter fitted with a magnetic sensor, connected to an RPM indicator is :
an AC voltage, the frequency of which varies with the RPM; the indicator converts the signal into square pulses which are then counted
Q5. The signal supplied by a transmitter fitted with a 3-phase AC generator, connected to RPM indicator, is :
a three-phase voltage, the frequency of which varies with the RPM; the indicator is provided with a motor which drives a magnetic tachometer
Q6. The transmitter of RPM indicator may consist of : 1- a magnetic sensor supplying an induced 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 :
1,2,3,4
Q7. The operating principle of the “induction” type of tachometer is to measure the:
rotation speed of an asynchronous motor energized by an alternator.
Q8. 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.
Q9. The RPM indicator (or tachometer) of a piston engine can include a small red arc within the arc normally used (green arc) In the RPM range corresponding to this small red arc the :
propeller generates vibration, continuous rating is forbidden
Q10. The disadvantage of an electronic rpm indicator is the :
necessity of providing a power supply source.
Q11. On an aeroplane equipped with a constant speed propeller, the RPM indicator enables :
control of the propeller regulator and the display of propeller RPM.
Q12. 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.
Q13. The advantages 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.
Q14. The advantages of single-phase A.C. generator tachometer are: 1- the suppression of spurious signals 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
1, 3.
Q15. 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 element is an asynchronous motor driving a magnetic tachometer
3, 5
Q16. 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 th
1, 2, 4.
