AEIS Chap 2 Mst Revision (Answers)

AEIS Chap 2 Mst Revision (Answers)
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  1. What is the purpose of a reverse current cutout relay?   a. It eliminates the possibility of reversed polarity of the generator output current.   b. It prevents overloading of the generator.   c. It prevents fluctuations of generator voltage.   *d. It opens the main generator circuit whenever the generator voltage drops below the battery voltage   2. How does a voltage regulator control the output of a D.C generator?   a. By varying the resistance of the armature circuit.   b. By varying the resistance of the rectifier circuit.   c. By varying the resistance of the stator circuit.   *d. By varying the resistance of the field circuit.   3. What are the general types of A.C motors used in aircraft systems?   *a. Induction and synchronous   b. Shaded pole and universal.   c. AC series and capacitor start.   d. Rheostat series and condenser start.   4. What is the effect of a counter emf in a motor?   a. It strengthens the applied voltage.   *b. It opposes the applied voltage.   c. It strengthens the applied current.   d. It increases the motor's speed of rotation.   5. What is the principal advantage of the series wound D.C motor?   *a. High starting torque.   b. Suitable for constant speed use.   c. Low starting torque.   d. Speed slightly higher when unloaded.   6. The direction in which wire carrying current in a generator will move when acted on by a magnetic field is determined by which of the following? a. The electron theory.   *b. The right hand rule.   c. The left hand rule.   d. The magnetic principle rule.   7. Arcing at the brushes and burning of the commutator of a motor may be caused by      *a. weak brush springs.   b. excessive brush spring tension.   c. a smooth commutator. d. low mica.   8. The speed of a synchronous A.C motor is determined by what characteristic of the motor circuit?   a. The voltage of the circuit.   b. The current flow of the circuit.   *c. The frequency of the applied voltage.   d. The resistance of the motor circuit.   9. Which type of D.C motor is commonly referred to as a constant speed motor?   a. Series wound motor.   b. Synchronous motor.   *c. Shunt wound motor.   d. Universal motor.   10. What is the circuit shown in the figure below? *a. Reverse current switch relay.   b. Reverse current cutout relay.   c. Carbon pile voltage regulator.   d. Variable resistor voltage regulator.   11. Which of the following statement is true about the voltage regulator shown in the figure below? *a. When carbon pile is compressed, the resistance is low. b. When carbon pile is compressed, the resistance is high. c. When carbon pile is decompressed, the resistance is low.  d. When carbon pile is compressed or decompressed, the resistance will not change. 12. What type of voltage regulator is shown in the figure below? *a. Variable resistor voltage regulator.   b. Vibrator type voltage regulator.   c. Carbon pile voltage regulator.   d. Transistorized voltage regulator. 13. Which of the following does not affect the E.M.F generated in a lap wound armature? *a. Number of pairs of poles.   b. Flux per pole.   c. Total number of conductors on armature.   d. Armature rotation speed.   14. Which of the following is false about wave or 2 circuit winding armature?   a. There are 2 paths in parallel irrespective of the number of poles.   b. Each path supplies 1/2 the total current output.   c. Two sets of brushes only are necessary   *d. Not allowed to fit more than 2 sets of brushes even if there are more poles. 15. Which of the following rectify the A.C current to D.C current in the external load circuit?   *a. Commutators   b. Brushes   c. Slip Rings   d. Bearings   16. Which of the following component function is to produce magnetic flux?   *a. Field coil.   b. Brushes and bearings.   c. Poles   d. Armature winding.      17. Which of the following factor that will not control the amount of voltage and current generated by electromagnetic induction in a generator?   a. Speed at which the conductors cut across the magnetic field.   b. Strength of the magnetic field.   c. Number of conductors which cut across the magnetic field.   *d. The load that is connected to the generator output.   18. Which of the following is not a factor necessary to produce electricity by electromagnetic induction?   a. A closed conductor called the armature.   b. A magnetic field.   c. Movement of the armature that cut across the magnetic field *d. Commutator   19. Which of the following is not a purpose of an aircraft D.C generator?   a. To change mechanical energy into electrical energy.   b. Supply power to operate all d.c. electrical and electronic devices on the aircraft   c. To keep the battery in a charged condition under all operating conditions   *d. It acts as an aircraft D.C standby generator in case the main generator fails.   20. What part is used in conventional DC generator to convert sinusoidal voltage generated into unidirectional voltage?   a. a)   Slip rings and brushes. b. a)   Semiconductor rectifiers. *c. Commutator and brushes   d. a)   Armature winding and field coils. 21. What is the reason for using laminated iron core instead of solid iron core in the armature of a DC generator?   *a. To reduce eddy-current loss   b. For good heat transfer   c. a)   To reduce weight and inertia.
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