DGCA Module 04 Electronic Fundamentals, 1st Session 2017 covered semiconductor devices, digital circuits, power supplies, gates, amplifiers and mixed type questions.
DGCA Module 04
1st session of 2017
1. LED is used for.
A) Amplification
B) Power circuit
C) Both
Answer
2. Which diode is heavily doped?
A) Zener
B) Tunnel
C) Normal
Answer
3. For a diode to be forward biased, the anode must be.
A) Positive
B) Negative
C) Negative with cathode
Answer
4. Which is the most commonly used.
A) Coating film
B) Semiconductor
C) Aluminium foil
D) Copper foil
Answer
5. The base material of PCB is.
A) Semiconductor
B) Insulator
C) Conductor
Answer
6. The emitter of a transistor is heavily doped, so in forward bias.
A) Inject electrons into the collector
B) Inject protons into the collector
A) Inject electrons into the base
Answer
7. A transistor can be regarded as.
A) 2 diodes
B) 3 diodes
C) 4 diodes
Answer
8. In NPN transistor.
A) The collector is negative with respect to the base
B) The emitter is negative with respect to the base
C) The emitter is positive with respect to the base
Answer
9. In NPN transistor.
A) The collector is negative with respect to the emitter
B) The emitter is positive with respect to the base
C) The emitter is positive with respect to the collector
Answer
10. In a torque synchro system, both the transmitter and receiver are the same in.
A) Construction
B) Operation
C) Construction & Operation both
Answer
11. In a torque synchro system, the rotor of the torque transmitter is.
A) Made up of 2 coils connected in series to form a unit.
B) Made up of 3 coils connected in series to form a unit.
C) Made up of 1 coil connected in series to form a unit.
Answer
12. In control synchro system, when the two rotors are aligned, the inductance between them is.
A) Low
B) Zero
C) Very High
Answer
13. ICs are comparatively.
A) Large
B) Very large
C) Extra Small
Answer
14. The PCBs after construction are stored.
A) High temperature
B) Low temperature
C) As per conditions (A and B)
Answer
15. A type of IC which has more than 1000 rated circuits integrated.
A) VLSI IC
B) LSR IC
C) MSLI IC
Answer
16. In case of varactor diodes.
A) Reverse bias decreases capacitance
B) Reverse bias increases capacitance
C) Reverse bias increases inductance
Answer
17. The surface of the PCB is coated with conformal coatings.
A) To prevent electrical flow
B) To enhance conductivity
C) To protect them from oxidation and contamination
Answer
18. In digital electronics, a NAND gate is a combination of.
A) AND + NOT
B) OR + NOT
C) NOR + NOT
D) XOR + NOT
Answer
19. A logic 1 in positive logic system represents.
A) Zero voltage
B) Low voltage
C) High voltage
Answer
20. Which flip-flop is known as a basic memory element.
A) JK Flip-Flop
B) SR Flip-Flop
C) D Flip-Flop
D) T Flip-Flop
Answer
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