Analog Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 168 - 171 of 249

Access detailed explanations (illustrated with images and videos) to 1176 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 450.00 -OR-

How to register? Already Subscribed?

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 Reflex Klystron oscillator has been replaced by various semiconductor oscillators.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 168 (2 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 following is unlikely to be used as pulsed device. It is the (June)

Choices

Choice (4)Response

a.

TWT

b.

Multi-cavity Klystron

c.

CFA

d.

BWO

Question 169 (3 of 3 Based on Passage)

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

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

The Multi-cavity Klystron (June)

Choices

Choice (4)Response

a.

Needs a long transit time through the buncher cavity to ensure current modulation.

b.

Is not a good low-level amplifier because of noise.

c.

Is not suitable for pulsed operation.

d.

Has a high repeller voltage to ensure a rapid transit time.

Question 170

Analog Circuits
Biasing, Bias Stability

Appeared in Year: 2013 (UGC-NET)

Question

Match List-Ⅰ List-Ⅱ▾

Match the following lists: (June)

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

SCR

(i)

dc drive control

(B)

Triac

(ii)

Induction motor control

(C)

Cycloconverter

(iii)

Unidirectional

(D)

Chopper

(iv)

Bidirectional

Choices

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

a.

  • (i)
  • (iv)
  • (iii)
  • (ii)

b.

  • (ii)
  • (iv)
  • (i)
  • (iii)

c.

  • (iii)
  • (iv)
  • (ii)
  • (i)

d.

  • (ii)
  • (iii)
  • (i)
  • (iv)

Question 171

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

Appeared in Year: 2013 (UGC-NET)

Question

Match List-Ⅰ List-Ⅱ▾

Match the following List -i with List-ii

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

Schmitt triggers

(i)

Two-stable states

(B)

Bistable multivibrator

(ii)

One-stable state

(C)

Astable multivibrator

(iii)

Square wave generator

(D)

Monostable multivibrator

(iv)

Free running oscillator

Choices

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

a.

  • (i)
  • (iv)
  • (iii)
  • (ii)

b.

  • (ii)
  • (i)
  • (iii)
  • (iv)

c.

  • (ii)
  • (iv)
  • (i)
  • (iii)

d.

  • (iii)
  • (i)
  • (iv)
  • (ii)

Developed by: