Electrical Engineering MCQs MCQs
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A silicon crystal is a/an ___________ of a semiconductor if every atom in the crystal is a silicon atom.
- A. Extrinsic
- B. Intrinsic
- C. P-type
- D. N-type
- Correct Answer: Option B
Which of the following is the equivalent circuit for a diode for third approximation?
- A. A switch only
- B. A switch in series with a battery in series with a resistance
- C. A switch in series with battery
- D. A switch in series with a resistance
- Correct Answer: Option B
An equivalent circuit of a diode in which it is represented as a switch in series with a barrier potential.
- A. First approximation
- B. Second approximation
- C. Third approximation
- D. Fourth approximation
- Correct Answer: Option B
When both emitter and collector junction are forward biased, the transistor is said to be at _________ region.
- A. Active
- B. Cut-off
- C. Breakdown
- D. Saturation
- Correct Answer: Option D
When the emitter junction is forward biased while the collector junction is reverse biased, the transistor is at ________ region.
- A. Cut-off
- B. Saturation
- C. Active
- D. Breakdown
- Correct Answer: Option C
Optocoupler is otherwise known as
- A. Laser
- B. Photodiodes
- C. Optoisolator
- D. Photoconductive cell
- Correct Answer: Option C
An LED and phototransistor is equivalent to a/an
- A. Thermocouple
- B. FET
- C. Optocoupler
- D. Regulator
- Correct Answer: Option C
Atomic weight of silicon at 300 K is
- A. 28.09
- B. 72.7
- C. 5.32
- D. 16
- Correct Answer: Option A
Approximately, the atomic weight of germanium is
- A. 32
- B. 28.09
- C. 72.7
- D. 16
- Correct Answer: Option C
The time taken by the diode to operate in the reversed condition from forward conduction.
- A. Maximum power time
- B. Reverse recovery time
- C. Lifetime
- D. Time allocation
- Correct Answer: Option B