Analog Electronics - 7


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10 Questions MCQ Test GATE ECE (Electronics) 2023 Mock Test Series | Analog Electronics - 7

Analog Electronics - 7 for Electronics and Communication Engineering (ECE) 2022 is part of GATE ECE (Electronics) 2023 Mock Test Series preparation. The Analog Electronics - 7 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Analog Electronics - 7 MCQs are made for Electronics and Communication Engineering (ECE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Analog Electronics - 7 below.
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Analog Electronics - 7 - Question 1

For the Wien-bridge oscillator circuit shown below, the condition for bridge balance is

Detailed Solution for Analog Electronics - 7 - Question 1

At oscillator frequency 
i.e. gain of non-inverting amplifier 
⇒ RB = 2RA

Analog Electronics - 7 - Question 2

Find the value of inductance in (mH) in the oscillator shown below to achieve a frequency of oscillation = 100 KHz is

Detailed Solution for Analog Electronics - 7 - Question 2

*Answer can only contain numeric values
Analog Electronics - 7 - Question 3

For the circuit shown in the figure the value of R to get oscillation of 100 kHz is ________ KΩ.


Detailed Solution for Analog Electronics - 7 - Question 3

The given oscillator is Colpitts’s oscillator

The condition for oscillation is

|Aβ|=1

A = -R2/R1

β=C2/C1

*Answer can only contain numeric values
Analog Electronics - 7 - Question 4

The figure shows a phase-shift oscillator circuit with voltage follower buffer stages.


The value of R2/R required for sustained oscillations is _____.
[Assume ideal op-amps and neglect loading effect].


Detailed Solution for Analog Electronics - 7 - Question 4
  • The basic amplifier of the circuit is the op-amp A3.
  • The output of amplifier is connected to 3 stage RC filter.
  • Voltage followers eliminate loading effect of each stage.


Transfer function of first RC network

RC networks are identical and no loading effect

The amplifier A3 is connected in inverting mode

The loop gain is

Substitute real part of denominator to zero

At this frequency

Analog Electronics - 7 - Question 5

The value of R in oscillator circuit shown in a given circuit below is chosen such that it oscillates at an angular frequency of ω. The value of ω and the required value of R will respectively be

Detailed Solution for Analog Electronics - 7 - Question 5

Hartley oscillator

 

Amp with +ve F.B

Loop again AB = 1 + j0         

At oscillation

∠AB = 0 (no reactance XL = XC)

At frequency of oscillation look lies resistive Network


For ideal op amp

Use voltage division Rule

R + 1 = 21

R = 20 kΩ

R = 2 × 104Ω 

*Answer can only contain numeric values
Analog Electronics - 7 - Question 6


The frequency of oscillation of the circuit in kilohertz is ______ kHz.


Detailed Solution for Analog Electronics - 7 - Question 6

The given circuit is wein bridge oscillator.

 

R3 = R4 = 159 KΩ

C1 = C2 = 1 nF

 

= 103 HZ

= 1 KHZ

Analog Electronics - 7 - Question 7

For the transistor oscillator circuit given below the frequency of oscillation is 8.5 kHz. The value of the collector resistor approximately is

 

 

Detailed Solution for Analog Electronics - 7 - Question 7

In a transistor phase shift oscillator the oscillation frequency

 

R, C are the resistor and the capacitor in phase shift circuit

RC is collector capacitance

⇒ RC = 2R = 10 kΩ 

*Answer can only contain numeric values
Analog Electronics - 7 - Question 8

The oscillation frequency if the below-shown oscillator is 1 kHz then the value of ‘L’ is ______ mH


Detailed Solution for Analog Electronics - 7 - Question 8

The given oscillator is Hartley oscillator, where the oscillation frequency.

 

= 253.3 mH

Leq = L + 5 mA

⇒ L = 253.3 – 5

= 248. 3 mH

Analog Electronics - 7 - Question 9

For the circuit shown the value of R1 and R2 such that the circuit generates oscillations of frequency 274 Hz is [Assume the time constant of the feedback RC network is 0.01 sec]

Detailed Solution for Analog Electronics - 7 - Question 9

Given figure is of A-stable multi-vibrator,

Time constant is given by

β = feedback factor

τ = time constant of feedback loop:

Option 3 satisfies the condition

*Answer can only contain numeric values
Analog Electronics - 7 - Question 10

The frequency of oscillation of the circuit shown below is ________ Hz.


Detailed Solution for Analog Electronics - 7 - Question 10

The given oscillator is Wien-bridge oscillator with R = 5 kΩ, C = 1 μF 

⇒ frequency of oscillation f = 1/2πRC

= 31.8 Hz

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