1. What gives the colour of an LED?
a) The plastic it is encased in
b)The active element
c) The type of gas used inside it
Answer:b
2. A germanium diode is used for
a) rectification
b)voltage stabilization
c) modulation
Answer:a
3. Why is a diode put in parallel with an LED?
a) To protect it from AC
b)So it will work only above a certain voltage
c) So it will work only below a certain voltage
Answer:a
4. When testing the forward bias of a diode with a multimeter
a) the positive lead of the ohmeter is placed on the cathode
b)the positive lead of the ohmeter is placed on the anode
c) it does not matter which terminal the positive lead of the ohmeter
is placed
Answer:b
5. In an NPN transistor the P is the
a) collector
b)base
c) emitter
Answer:b
6. The output of a tachogenerator is
a) proportional to speed of rotation
b)proportional to position
c) proportional to acceleration
Answer:
7. AC power is supplied to
a) torque receiver only
b)torque transmitter only
c) both the torque receiver and torque transmitter
Answer:c
8. What gate does the following Boolean expression represent
F = A.B.C
a) AND
b)OR
c) NOT
Answer:a
9. What gate does the following Boolean expression represent
F = A+B+C
a) NOT
b)NOR
c) OR
Answer:c
10. To decrease the voltage gain of a common emitter amplifier you
would increase the resistance in the
a) base circuit
b)collector circuit
c) emitter circuit
Answer:b
11. A resolver has
a) 2 coils on the rotor and 2 coils on the stator
b)3 coils on the rotor and 2 coils on the stator
c) 2 coils on the rotor and 3 coils on the stator
Answer:a
12. The 'null' point on a control synchro is when the two rotors are
a) at 90o to each other
b)parallel to each other
c) wired in series
Answer:a
13. A FET when compared to a junction transistor is
a) low impedance
b)high impedance
c) current operated
Answer:b
14. One characteristic of the emitter follower is
a) low resistance output
b)low current amplification
c) high voltage amplification
Answer:a
15. A reduction from the optimum setting of the velocity feedback in a
servo loop could cause
a) low servo gain
b)instability
c) slow response
Answer:b
16. In a torque synchro system, the power supply is connected to
a) the rotor windings of the transmitter only
b)the rotor windings of both the transmitter and receiver
c) the stator windings of the transmitter
Answer:b
17. Reversal of the complete power to a torque synchro system will
a) have no effect
b)cause reverse rotation of the receiver rotor
c) displace the receiver rotor by 180o
Answer:a
18. The power supply to a torque synchro system is
a) AC
b)DC
c) AC or DC
Answer:a
19. A zener diode
a) stabilizes voltage at a predetermined level
b)allows current to flow in one direction
c) acts like a switch
Answer:a
20. The common collector amplifier is sometimes called the emitter
follower circuit because
a) the emitter current follows the collector current
b)the emitter voltage follows the base voltage
c) the emitter voltage follows the collector voltage
Answer:b
