Analog Electronics-2.pdf

Devansh Raghuwanshi  (Enroll User)

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ANALOG ELECTRONICS-2 - REPORTS OVERALL ANALYSIS ALL(16)

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Devansh Raghuwanshi Course: GATE+ESE Electrical Engineering (EE)

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Q. 1 An ideal trans-conductance amplifier has the following characteristic FAQ Have any Doubt ? A

input impedance = ∞, output impedance = ∞ Your answer is Correct

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Solution : (a) In a trans-conductance amplifier input is voltage and output is current so input impedance is ∞ and output impedance is ∞

B

input impedance = 0, output impedance = 0

C

input impedance = ∞, output impedance = 0

D

input impedance = 0, output impedance = ∞

QUESTION ANALYTICS

Q. 2 An amplifier has open loop gain of 10, and input impedance of 1 kΩ and output impedance of 100 Ω. If negative feedback with feedback factor of 0.99 is connected to the amplifier in a voltage series feedback mode. The new input and output impedance are. FAQ Have any Doubt ? A

91.74 Ω, 1.09 kΩ

B

91.7 Ω, 9.17 Ω

C

10.9 kΩ, 1.09 kΩ

D

10.9 kΩ, 9.17 Ω Correct Option

Solution : (d)

QUESTION ANALYTICS

Q. 3 Consider two amplifiers A1 and A2. The rise time for first stage is 0.3 ms and for the second stage is 0.4 msec. If the two systems are connected in cascade form with each other then the rise time of the combined system will be FAQ Have any Doubt ?

A

0.5 msec

B

0.55 msec Correct Option

Solution : (b)

C

0.4 msec

D

0.3 msec

QUESTION ANALYTICS

Q. 4 In the Schmitt trigger circuit shown below, the zener diodes have Vz (reverse saturation voltage) = 6.3 V and VD (forward voltage drop) = 0.7 V. If the circuit has the input lower trip point (LTP) = 0 V, then the value of R1/R2 is given by

FAQ Have any Doubt ? A

∞

B

4.67 Correct Option

Solution : (b)

C

0.58

D

2.67

QUESTION ANALYTICS

Q. 5 Input to the opamp is Vi = 10 sin ωt. The opamp is connected as shown below

The average value of V0 is ________ V . FAQ Have any Doubt ? -1.28 (-1.30 - -1.20) Correct Option Solution : -1.28 (-1.30 - -1.20)

QUESTION ANALYTICS

Q. 6 The open loop gain of a voltage amplifier is 100 and bandwidth is 100 Hz. If negative feedback with feedback factor β = 0.1 is applied in the amplifier then the bandwidth of closed loop amplifier will be _______ Hz. FAQ Have any Doubt ? 1100 (1090 – 1110) Correct Option Solution : 1100 (1090 – 1110)

QUESTION ANALYTICS

Q. 7 An op-amp circuit is given below.

The overall voltage gain for the circuit will be _________. FAQ Have any Doubt ? -8 (-8.10 - -7.90)

(

) Correct Option

Solution : -8 (-8.10 - -7.90)

QUESTION ANALYTICS

Q. 8 Consider the circuit shown in the figure below.

FAQ Have any Doubt ? A

1 Correct Option

Solution : (a)

B

2

C

3

D

4

QUESTION ANALYTICS

Q. 9 In the given circuit PMOS and NMOS have

If drain current of NMOS is 1 mA then output resistance of circuit will be (Assume no channel length modulation) FAQ Have any Doubt ? A

1599.5 Ω

B

1036.66 Ω

C

707.10 Ω

D

353.55 Ω

Solution : (d)

Correct Option

QUESTION ANALYTICS

Q. 10 The figure shown below represents a schmitt trigger

Then the width of the hysteresis loop will be FAQ Have any Doubt ? A

12 V Correct Option

Solution : (a)

B

8V

C

13 V

D

10 V

QUESTION ANALYTICS

Q. 11 Consider the circuit shown below, β = ∞ , VBE = 0.7 V, VCEsat = 0.2 V. The early effect is neglected then V0 is (VT = 26 mV)

FAQ Have any Doubt ? A

3.1 – 0.289 sin ωt

B

3.1 – 0.88 sin ωt

C

5.9 – 0.289 sin ωt

D

5.4 – 0.88 sin ωt

Solution : (d)

Correct Option

QUESTION ANALYTICS

Q. 12 The transfer characteristic for precision rectifier circuit shown below is (assume op-amp and diodes are ideal and voltmeter is used to measure output voltage)

FAQ Have any Doubt ? A

B

C

Correct Option Solution : (c)

D

None

QUESTION ANALYTICS

Q. 13 A cascade connection of two current amplifier A1 and A2 is shown in the figure. The gain of first amplifier is 100 and second amplifier is 1 and input impedance of each amplifier is 20 Ω and output impedance is also 20 Ω. If input current source is an ideal source then value of V0 is ________ kV.

FAQ Have any Doubt ? 9.98 (9.00 - 10.00) Correct Option

Solution : 9.98 (9.00 - 10.00)

QUESTION ANALYTICS

Q. 14 The value of V0 in the circuit, shown in figure is ________ V.

FAQ Have any Doubt ? -13.5 (-14 - -13)

Correct Option Solution : -13.5 (-14 - -13)

QUESTION ANALYTICS

Q. 15 Consider the phase shift oscillator as shown in the figure below.

If the frequency of oscillations of the circuit is 100 kHz, then the value of the resistance R will be _____ kΩ. FAQ Have any Doubt ? 6.5 (6.0 - 7.0) Correct Option Solution : 6.5 (6.0 - 7.0)

QUESTION ANALYTICS

Q. 16 The saturation voltage of ideal opamp shown below is ± 10 V. The magnitude of average value of output voltage V0 of following circuit at steady state will be _________ V.

FAQ Have any Doubt ? 2.66 (2.50 - 2.70) Correct Option Solution : 2.66 (2.50 - 2.70)

QUESTION ANALYTICS