Analog Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 164 - 167 of 249

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Question 164

Analog Circuits
Biasing, Bias Stability

Appeared in Year: 2018 (UGC-NET)

Question

Match List-Ⅰ List-Ⅱ▾

Match the two lists and choose the correct answer from the code given below: (December)

List-Ⅰ (Column-I)List-Ⅱ (Column-II)
(A)

Output impedance in common base

(i)

Less than unity

(B)

Input impedance in common base

(ii)

Very high (= 2MΩ)

(C)

Current gain in common base

(iii)

1 (ONE)

(D)

Voltage gain in common collector

(iv)

Lowest

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (i)
  • (iii)
  • (iv)
  • (ii)

b.

  • (i)
  • (ii)
  • (iv)
  • (iii)

c.

  • (ii)
  • (iv)
  • (i)
  • (iii)

d.

  • (ii)
  • (i)
  • (iii)
  • (iv)

Question 165

Analog Circuits
Function Generators, Wave-Shaping Circuits and 555 Timers

Appeared in Year: 2013 (UGC-NET)

Question

Assertion-Reason▾

Assertion(Ꭺ)

8421 code is weighted code. (June)

Reason(Ꭱ)

8421 code is self-complementary.

Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question 166

Analog Circuits
Criterion for Oscillation, Single-Transistor and Opamp Configurations

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

Which of the following oscillator make use of both positive and negative feedbacks? (June)

Choices

Choice (4)Response

a.

Hartley oscillator

b.

Phase shift oscillator

c.

Colpit՚s oscillator

d.

Wein-Bridge oscillator

Passage

Read the passage and answer the following five questions:

Microwave tubes are used as microwave amplifiers and oscillators. Three general type of microwaves tubes in which third type of tubes are useful. In this tube there is an interaction between an electron and an RF field is continuous. The Travelling Wave Tube (TWT) is the prime example of this interaction. It is an amplifier whose oscillator counterpart is called Backward Wave Oscillator (BWO) . Another group of tube in which a magnetic field ensures a constant electron beam – RF field interaction and this is complimented by the cross-field amplifier (CFA) . Multi-cavity Klystron is used as an amplifier of microwaves and it consists of buncher cavity and cache cavity. The Reflex Klystron is a low power and low efficiency microwave oscillator. Reflex Klystron oscillator has been replaced by various semiconductor oscillators.

Question 167 (1 of 3 Based on Passage)

Analog Circuits
Criterion for Oscillation, Single-Transistor and Opamp Configurations

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

One of the reason why vacuum tubes eventually fail at microwave frequencies is that their (June)

Choices

Choice (4)Response

a.

Transit-time becomes too short

b.

Noise figure increases

c.

Series inductive reactance become too small

d.

Shunt capacitive reactance becomes too large

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