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Semiconductor Electronics · Question 36

NEET 2017MCQEasy📈 Topic in 12% papers+4−1
1

In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 k . If current gain is 100 and the base resistance is 2 k , the voltage and power gain of the amplifier is

  1. 15 and 200
  2. 150 and 15000
  3. 20 and 2000
  4. 200 and 1000

Answer

(2) 150 and 15000

Solution

Current gain = 100, RC = 3 k , RB = 2 k

Voltage gain AV = RCRB

= 100 32 = 150

Power gain = AV

= 100 150 = 15000

Answer: (2)

Out of syllabusNEET 2017

Keep practising — Semiconductor Electronics

2

To get output 1 for the following circuit, the correct choice for the input is [figure]

  1. A = 1, B = 1, C = 0
  2. A = 1, B = 0, C = 1
  3. A = 0, B = 1, C = 0
  4. A = 1, B = 0, C = 0
NEET 2016 (Phase 1)
3

Consider the junction diode as ideal. The value of current flowing through AB is [figure]

  1. 10-1 A
  2. 10-3 A
  3. 0 A
  4. 10-2 A
NEET 2016 (Phase 1)
4

A npn transistor is connected in common emitter configuration in a given amplifier. A load resistance of 800 is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuit is 192 , the voltage gain and the power gain of the amplifier will respectively be

  1. 4, 4
  2. 4, 3.69
  3. 4, 3.84
  4. 3.69, 3.84
Out of syllabusNEET 2016 (Phase 1)
5

The given circuit has two ideal diodes connected as shown in the figure. The current flowing through the resistance R1 will be [figure]

  1. 2.5 A
  2. 10.0 A
  3. 1.43 A
  4. 3.13 A
NEET 2016 (Phase 2)
6

What is the output Y in the following circuit, when all the three inputs A, B, C are first 0 and then 1? [figure]

  1. 0, 1
  2. 0, 0
  3. 1, 0
  4. 1, 1
NEET 2016 (Phase 2)
7

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 k is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is 1 k , then the input signal voltage is

  1. 10 mV
  2. 20 mV
  3. 30 mV
  4. 15 mV
Out of syllabusNEET 2016 (Phase 2)
8

In the given figure, a diode D is connected to an external resistance R = 100 Ω and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be [figure]

  1. 20 mA
  2. 35 mA
  3. 30 mA
  4. 40 mA
AIPMT 2015
9

The input signal given to a CE amplifier having a voltage gain of 150 is Vi = 2 (15t + 3 ). The corresponding output signal will be

  1. 2 (15t + 5 6 )
  2. 300 (15t + 4 3 )
  3. 300 (15t + 3 )
  4. 75 (15t + 2 3 )
Out of syllabusAIPMT 2015
10

Which logic gate is represented by the following combination of logic gates? [figure]

  1. AND
  2. NOR
  3. OR
  4. NAND
AIPMT 2015 (Cancelled)
11

If in a p-n junction, a square input signal of 10 V is applied, as shown, [figure] then the output across RL will be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2015 (Cancelled)

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