M-4 Electronics Fundamentals Final Practice Test [20 Question and 25 Minutes]

M-4 Electronic Fundamentals

Final Practice Test

  

 

1. In a forward biased diode, current is carried by ?
   1.   majority carriers
   2.   minority carriers
   3.   both
2. Diodes are ?
   1.   conductors
   2.   semi-conductors
   3.   nsulators
3. A band pass filter excludes frequencies ?
   1.   below the frequency required only
   2.   above and below the frequency required
   3.   above the frequency required only
4. A zener diode is designed to operate ?
   1.   below its breakdown voltage
   2.   either above or below its breakdown voltage
   3.   above its breakdown voltage
5. A triac is a type of ?
   1.   thermistor
   2.   transistor
   3.   thyristor
6. When a PN junction is forward biased, it conducts via ?
   1.   intrinsic carrier
   2.   majority carrier
   3.   minority carrier
7. If the reverse bias voltage across a diode is too high ?
   1.   load current reduces to zero
   2.   load current increases rapidly
   3.   load current reverses
8. An LED which emits green light uses ?
   1.   gallium phosphide
   2.   gallium arsenide
   3.   gallium arsenide phosphide
9. N' type materials are doped with ?
   1.   acceptors
   2.   acceptors and donors
   3.   donors
10. In an NPN transistor the P is the ?
    1.   collector
    2.   emitter
    3.   base
11. The rotor of a magnesyn transmitter is ?
    1.   a permanent magnet
    2.   an ac electromagnet
    3.   a dc electromagnet
12. What device transfers one energy type to another ?
    1.   Transponder
    2.   Transducer
    3.   Transmitter
13. What control system is used on an input that gives a controlled predetermined output?
    1.   Control Servo
    2.   Closed Loop
    3.   Open Loop
14. A rate control servo system with a steady input voltage will give ?
    1.   decreasing speed
    2.   increasing speed
    3.   constant speed
15. The phase difference between the supplies of a two phase induction motor is ?
    1.   90°
    2.   180°
    3.   0°
16. An LVDT has ?
    1.   an output winding which is wound in series opposition
    2.   an input winding whose voltage will change with load movement
    3.   an output winding whose voltage and frequency is linear to load angular movement
17. In a synchro system, if two stator lines are crossed the receiver will ?
    1.   be 180° out
    2.   not be affected
    3.   reverse direction
18. A control synchro system pointer is ?
    1.   actuated by a permanent magnet
    2.   displaced by the torque of the stator
    3.   motor driven
19. TR is the abbreviation for a ?
    1.   transmitter Resolver
    2.   torque Receiver
    3.   torque Rynchro
20. What power is required for a desynn indicator system ?
    1.   DC
    2.   AC 400 Hz
    3.   AC 50 Hz