Demo | MyPerfectice

Q1:

Match List-I (type of amplifier) with List-II (property) and select the correct relation between the Lists?

List-I	List-II
A. Single ended class- A	1. Meduim efficiency with minimum distortion.
B .Class - AB push-pull	2. High efficiency with cross over distortion.
C. Class - B push-pull	3. Harmonic generator with highest possible conversion efficiency
D. Class - C.	4. Poor conversion efficiency with minimum distortion.

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Analog Circuits

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A-2, B-3, C-4, D-1

A-4, B-1, C-2, D-3

A-2, B-1, C-4, D-3

A-4, B-3, C-2, D-1

Q2:

Value of R in the Oscillator shown in the given figure is so chosen that it just oscillates at an angular frequencies of $' ω'$ . The value of ‘ $ω$ ’ and the required Value of R will respectively be

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Analog Circuits

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$10^{5} r a d / \sec, 2 \times 10^{4} Ω$

$2 \times 10^{4} r a d / \sec, 2 \times 10^{4} Ω$

$2 \times 10^{4} r a d / \sec, 10^{5} Ω$

$10^{5} r a d / \sec, 10^{5} Ω$

Q3:

The Oscillator Circuit shown in the figure has an ideal inverting amplifier it frequency of oscillation (in H_Z) is

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Analog Circuits

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$\frac{1}{(2 π \sqrt{6} R C)}$

$\frac{1}{(2 π R C)}$

$\frac{1}{(\sqrt{6} R C)}$

$\frac{1}{\sqrt{6} (2 R C)}$

Q4:

In the voltage regulator circuit shown in the figure, the op-amp is ideal. The BJT has V_BE = 0.7 V and $β$ = 100, and the zener voltage is 4.7 V. For a regulated output of 9V, the value of R(in $Ω$ ) is………. .

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Q5:

Consider the Schmidt trigger circuit shown below

A triangular wave which goes from –12V to 12V is applied to the inverting input of the OPAMP. Assume that the output of the OPAMP swings from+15V to –15V. The voltage at the non-inverting input switches between

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Analog Circuits

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–12V and +12V

–5V and +5V

–7.5V and –7.5V

0V and 5V

Q6:

What is the impact on input and output impedances in current amplifier feedback topology?

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Analog Circuits

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Both input and output impedances increases.

Both input and output impedances decreases.

Input impedance increases whereas output impedance decreases.

Input impedance decreases and output impedance increases

Q7:

Trans conductance amplifier is also named as?

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Analog Circuits

Options:

series shunt amplifier

shunt series amplifier

series series amplifier

shunt shunt amplifier

Q8:

In the cascade amplifier shown in the given figure, if the common – emitter stage (Q₁) has a trans conductance gm₁, and the common base stage (Q₂) has a trans conductance gm₂, then the overall trans conductance g( = i₀/v_i) of the cascade amplifier is

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g_m1

g_m2

$\frac{g_{m 1}}{2}$

$\frac{g_{m 2}}{2}$

Q9:

A JFET (with tuned load in the drain Circuit) is operated as a tuned Amplifier. Given for the FET $g_{m} = 3 \times 10^{- 3}, r_{d} = 60 K Ω, C_{d s} = 10 P F$ and for the drain circuit $L = 10 m H$ is parallel with $R = 80 K Ω, C = 90 P F, R_{D} = 30 K Ω .$ .

The magnitude of Voltage gain of the amplifier at resonance is ………… .

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Q10:

An Amplifier has two identical Cascaded Stages. Each stages has a bandwidth of 20 KH_Z. The overall bandwidth shall approximately be equal to

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Analog Circuits

Options:

10 KH_Z

12.9 KH_Z

20 KH_Z

28.3 KH_Z

Q11:

A small Signal Voltage amplifier in common emitter configuration was working satisfactorily. Suddenly its emitter- bypass Capacitor (C_E) got disconnected its

1. Voltage gain will decrease

2. Voltage gain will increase.

3. Bandwidth will decrease.

4. Bandwidth will increase.

Which of these statements are correct?

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Analog Circuits

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1 and 4 only

2 and 3 only

3 and 4 only

1, 2, 3 and 4

Q12:

In the circuit shown find the value of I (mA)

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Q13:

Which one of the following statement is correct.

The rise time of an amplifier is

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Analog Circuits

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Directly proportional to the upper 3-dB frequency.

Inversely proportional to the upper 3-dB frequency.

Directly proportional to the lower 3-dB frequency.

Inversely proportional to the lower 3-dB frequency.

Q14:

In the circuit shown below, capacitors C₁ and C₂ are very large and are shorts at the input frequency. v_i is a small signal input. The gain magnitude |v₀/v_i| at 10 Mrad/s is

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EE_M

Section:

Analog Circuits

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Maximum

Unity

Minimum

Zero

Q15:

Given $r_{d} = 20 K Ω, I_{D S S} = 10 m A, V_{P} = - 8 V .$

$Z_{i}$ and $Z_{O}$ of the circuit are respectively

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Analog Circuits

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2 $m Ω$ and

2 $m Ω$ and $\frac{20}{11}$ $K Ω$

Infinity and 2 $m Ω$

Infinity and $\frac{20}{11}$ $K Ω$

Q16:

A dc power supply has a no-load voltage of 30V and a full-load voltage of 25V at a full load current of 1A. Its output resistance and load regulation, respectively are

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Analog Circuits

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5 $Ω$ and 20%

25 $Ω$ and 20%

5 $Ω$ and 16.7%

25 $Ω$ and 16.7%

Q17:

One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of comparator will be.

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Analog Circuits

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a sinusoid

a full rectified sinusoid

a half rectified sinusoid

a square wave.

Q18:

A BJT is to be used in a high freq. circuit in common emitter amplifier. For a higher upper cut-off frequency ( $C μ, C π$ and $r_{o}$ have their usual meanings)

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$C μ$ should be as small as possible.

$r_{o}$ and $C μ$ should be as large as possible.

$C π$ and $C μ$ should be as large as possible.

$r_{o}$ , $C π$ and $C μ$ should be as large as possible.

Q19:

In the following Si BJT circuit if $V_{B B} = 5 V, V_{C C} = 10 V, β = 100.$

The value of $R_{B}$ to maintain the operating point $(V_{C C}, I_{C}) = [5 V, 10 m A]$

Rc=0.5 $K Ω$

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Analog Circuits

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13 $K Ω$

23 $K Ω$

33 $K Ω$

43 $K Ω$

Q20:

List-I

List-II

A. The current gain of a BJT

will be increased .

1. The collector doping concentration

is increased.

B. The current gain of a BJT

will be reduced.

2. The base width is reduced.

C. The break-down voltage of a BJT

will be reduced.

3. The emitter doping concentration

to base doping concentration ratio is reduced.

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Section:

Analog Circuits

Options:

A-1, B-2, C-3

A-3, B-2, C-1

A-3, B-1, C-2

A-2, B-3, C-1

ECE - Mock Test - 8