Results
Q1. 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
Q2. The disadvantage of an electronic rpm indicator is the :
necessity of providing a power supply source.
Q3. 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.
Q4. The operating principle of the “induction” type of tachometer is to measure the:
rotation speed of an asynchronous motor energized by an alternator.
Q5. 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.
Q6. 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.
Q7. 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.
Q8. On an aeroplane equipped with a constant speed propeller, the RPM indicator enables :
control of the propeller regulator and the display of propeller RPM.
Q9. A synchroscope is used on aircraft to:
set several engines to the same speed.
Q10. 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
Q11. 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.
Q12. 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
Q13. 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
Q14. 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
Q15. 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
Q16. The electronic tachometer sensor is composed of:
a notched wheel rotating in front of an electro-magnet.
