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This mock test of Analog Electronics 7 for Electronics and Communication Engineering (ECE) helps you for every Electronics and Communication Engineering (ECE) entrance exam.
This contains 10 Multiple Choice Questions for Electronics and Communication Engineering (ECE) Analog Electronics 7 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

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

Solution:

At oscillator frequency

i.e. gain of non-inverting amplifier

⇒ R_{B} = 2R_{A}

QUESTION: 2

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

Solution:

*Answer can only contain numeric values

QUESTION: 3

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

Solution:

The given oscillator is Colpitts’s oscillator

The condition for oscillation is

|Aβ|=1

A = -R_{2}/R_{1}

β=C_{2}/C_{1
}

*Answer can only contain numeric values

QUESTION: 4

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

The value of R_{2}/R required for sustained oscillations is _____.

[Assume ideal op-amps and neglect loading effect].

Solution:

- The basic amplifier of the circuit is the op-amp A
_{3}. - 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 A

The loop gain is

Substitute real part of denominator to zero

At this frequency

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

Solution:

**Hartley oscillator
**

Amp with +ve F.B

Loop again AB = 1 + j0

At oscillation

∠AB = 0 (no reactance X_{L} = X_{C})

At frequency of oscillation look lies resistive Network

For ideal op amp

Use voltage division Rule

R + 1 = 21

R = 20 kΩ

R = 2 × 10^{4}Ω

*Answer can only contain numeric values

QUESTION: 6

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

Solution:

The given circuit is wein bridge oscillator.

R_{3} = R_{4} = 159 KΩ

C_{1} = C_{2} = 1 nF

= 10^{3} HZ

= 1 KHZ

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

Solution:

In a transistor phase shift oscillator the oscillation frequency

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

R_{C} is collector capacitance

⇒ R_{C} = 2R = 10 kΩ

*Answer can only contain numeric values

QUESTION: 8

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

Solution:

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

= 253.3 mH

L_{eq} = L + 5 mA

⇒ L = 253.3 – 5

= 248. 3 mH

QUESTION: 9

For the circuit shown the value of R_{1} and R_{2} such that the circuit generates oscillations of frequency 274 Hz is [Assume the time constant of the feedback RC network is 0.01 sec]

Solution:

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

QUESTION: 10

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

Solution:

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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