DGCA Module 04
1st Session of 2026
1. PN junction consist of.
A) Ionized donor on P side and ionized acceptor on N side
B) Ionized donor on N side and ionized acceptor on P side
C) Accumulate holes on P side and electron on N side
Answer
2. Varactor diode.
A) Capacitance increases as reverse bias
B) Capacitance decreases as forward bias
C) Capacitance is max at saturation point in reverse bias
D) All are correct
Answer
3. Zener diode.
A) Connected in series with the load and used in forward bias
B) Connected in parallel with the load and used in reverse bias
C) As in B and used for voltage regulation
D) None of the above
Answer
4. In photo diode current in reverse bias.
A) Is less when minority charged carrier is injected in the junction region
B) Is less when majority charged carrier is injected in the junction region
C) Is more when minority charged carrier is injected in the junction region
D) Is more when majority charged carrier is injected in the junction region
Answer
5. Minimum no. of diode required in half wave rectifier.
A) 1
B) 2
C) 4
Answer
6. Multivibrator is defined as which of the following.
A) Pulse generator
B) Made up of a circuit containing resistors and capacitors
C) An electronic circuit used to generate square or rectangular waveforms
Answer
7. In which type of rectifier is a transformer compulsory.
A) Half wave
B) Full wave centre tap
C) Bridge rectifier
Answer
8. Mark the correct statement (MTCS) regarding a transistor.
A) Base is the biggest
B) Collector is heavily doped
C) Emitter is heavily doped
D) AOTA
Answer
9. Emitter is heavily doped to inject charge carrier to.
A) Base
B) Collector
C) Collector and base
D) None of the above
Answer
10. ICs (Integrated Circuits) are located where.
A) In microprocessors and electronic chips
B) In mechanical linkages and gear systems
C) In hydraulic pipelines and actuators
Answer
11. Holes in PCB are.
A) Insulating
B) Conductive
C) Both
Answer
12. PCB are made up of.
A) Thick sheet of conductive material
B) Thin sheet of conductive material
C) Thin sheet of non-conductive material
Answer
13. ICs are.
A) More reliable, low cost, low power consumption
B) More reliable, high cost, low power consumption
C) More reliable, low cost, high power consumption
D) Less reliable, low cost, high power consumption
Answer
14. In CT synchro the output is in.
A) Current
B) Voltage
C) Both
Answer
15. In CT synchro stator induces ——— on rotor.
A) Voltage
B) Current
C) Both
Answer
16. In differential synchro stator is identical with.
A) Stator of transmitter
B) Stator of receiver
C) Both
Answer
17. The colour of LED depends upon.
A) Voltage applied
B) Type of material used
C) Current
Answer
18. In IC of +5V the voltage regulator will regulate.
A) +5 volts between input and output
B) +5 volts between input and ground
C) Upto +15 volts
Answer
19. In transistor.
A) E-B is reverse bias and B-C is reverse biased
B) E-B is reverse bias and B-C is forward biased
C) E-B is forward bias and B-C is reverse biased
D) E-B is forward bias and B-C is forward biased
Answer
20. The dynamic test performed on a unbiased diode gives us the.
A) Resistance in forward bias and reverse bias
B) Resistance in forward only
C) Resistance in reverse bias only
Answer
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