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Semiconductor Electronics · Question 97

AIPMT 2003MCQEasy📈 Topic in 50% papers+4−1
1

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

  1. 25 Hz
  2. 50 Hz
  3. 70.7 Hz
  4. 100 Hz

Answer

(4) 100 Hz

Solution

In a full-wave rectifier both half-cycles of the a.c. input produce an output pulse.

⇒ Number of output pulses per second = 2 input frequency

∴ Ripple frequency = 2 50 = 100 Hz

Answer: (4)

AIPMT 2003

Keep practising — Semiconductor Electronics

2

Barrier potential of a p-n junction diode does not depend on

  1. diode design
  2. temperature
  3. forward bias
  4. doping density
AIPMT 2003
3

An n-p-n transistor conducts when

  1. both collector and emitter are positive with respect to the base
  2. collector is positive and emitter is negative with respect to the base
  3. collector is positive and emitter is at same potential as the base
  4. both collector and emitter are negative with respect to the base
Out of syllabusAIPMT 2003
4

In a p-n junction

  1. high potential at n side and low potential at p side
  2. high potential at p side and low potential at n side
  3. p and n both are at same potential
  4. undetermined.
AIPMT 2002
5

The given truth table is for which logic gate? [figure]

  1. NAND
  2. XOR
  3. NOR
  4. OR.
AIPMT 2002
6

For the given circuit of p-n junction diode, which is correct? [figure]

  1. in forward bias the voltage across R is V
  2. in reverse bias the voltage across R is V
  3. in forward bias the voltage across R is 2V
  4. in reverse bias the voltage across R is 2V.
AIPMT 2002
7

For a transistor ICIE = 0.96, then current gain for common emitter is

  1. 12
  2. 6
  3. 48
  4. 24
Out of syllabusAIPMT 2002
8

The given truth table is for which logic gate [figure]

  1. NAND
  2. XOR
  3. NOR
  4. OR
AIPMT 2001
9

The current in the circuit will be [figure]

  1. 540 A
  2. 550 A
  3. 510 A
  4. 520 A
AIPMT 2001
10

For a common base circuit if ICIE = 0.98 then current gain for common emitter circuit will be

  1. 49
  2. 98
  3. 4.9
  4. 25.5
Out of syllabusAIPMT 2001
11

From the following diode circuits, which diode is in forward biased condition?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2000

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