Marathon Series Analog Circuits for ESE & GATE EC Exams

Question 1

The Zener diode regulator shown in circuit has a source voltage Vs= 12sinωt

If the Zener diode has a Zener diode voltage of 6V then draw the output waveform across resistance ‘R’?

Question 2

In the circuit below, the operational amplifier is ideal. If V₁ = 10 mV and
V₂ = 50 mV, the output voltage (V_out) is

Question 3

For the circuit shown in the figure below the voltage V₀ is (assume diode is ideal)

Question 4

Consider the circuit shown below:

The value of input resistance Rin is (Assuming the op-amp to be ideal)

Question 5

A half wave rectifier has a diode with internal resistance R_f = 20 Ω and load resistance of R_L = 1 k Ω. If the rectifier is supplied with 110 V rms source then the efficiency of the half wave rectifier is

Question 6

In the BJT circuit below, assume

and CE current gain

very large. Then the collector to base voltage

______V

Question 7

Consider a MOS circuit as shown below with both transistors

and

identical and have

,

, Then

Question 8

For the ideal op-amp circuit, the voltage gain

is ____

Question 9

The voltage gain

of the ideal voltage amplifier circuit having a gain of 100 V/V with a resistance

connected between its input and output terminals as shown below will be

Question 10Multiple Correct Options

Which of the following is correct

(i) If α = 0.989 then β = 89.90, = 90.90

(ii) if β = 99 then ∝ = 0.99, = 98

(iii) if = 90 then ∝ = 0.98, β = 89

Question 11

The maximum value of output voltage (in volts) for the circuit shown in figure below, for the input given as

Question 12

The MOSFET circuit shown in figure

If the dc output voltage V_out = 5V. Assume, that the MOSFET operates in the saturation region and has parameter k = 2 mA/V² and V_T = 1V the value of the dc input Voltage V₁ is

Question 13

The input V₁ to the circuit shown in figure before is a square wave of amplitude ±1V and frequency 100 Hz.

Assume ideal components, the peak-to-peak amplitude of the output V_a is

Question 14

Consider the circuit shown below:

If the input voltage V_in = 1mV, then the output voltage V₀ is

(Assume op-amp to be ideal)

Question 15

In the circuit shown below, all the op-amps are ideal.

The output voltage V_o is ___________Volts.

Question 16

Consider the circuit shown below :

The transistor T_l has V_BE = 0.7 V and β = 100, The Q point of the transistor) I_c & V_CE) is equal to?

(Assume that, I_CO is negligible)

Question 17

Consider a circuit shown in figure below:

The value of voltage gain

is equal to __________. (Consider V_T = 25 mV and β to be very large)

Question 18

A current of 5.64 mA is required through the LED to make it work properly. Thus the minimum value of input voltage to be applied to the input to make the LED glow is ___________V. (Assume V_BE = 0.7 V).

Question 19

Calculate the output voltage for this circuit when V₁ = 2.5 V and V₂ = 2.25 V.

Question 20

For the circuit shown below if thermal voltage (V_T) is 25 mV and V₁ – V₂ = 0.3 V, then consider ideal BJT’s if

. Then the value of ‘a’ is ________. (Both BJT’s are identical).

Question 21

The diode in the circuit shown below and diodes are ideal. Show the transfer characteristics of circuit if

–20V ≤ V₁ ≤ 20V

Question 22

In the circuit shown in figure, the output voltage V₀ is __________, if the NMOS transistor have V_th = 1V of

Question 23

Consider the circuit shown below. The transistors are perfectly matched with the parameters

V_TN = 1V

V_TP = – 1V

Assume λ = 0 for both transistor

For the value of V₁ = 2.5 V, then the value of I_DN and I_DP is?

Question 24Multiple Correct Options

(i) In Saturation region, the output resistance of MOSFET is independent of modulation coefficient.

(ii) The units for Modulation coefficient is V^–1

(iii) The output resistance of MOSFET in saturation region is directly proportional to modulation coefficient.

(iv) The output resistance of MOSFET in saturation region is inversely proportional to modulation coefficient.

Which of the following statements/s is/are correct?

Question 25Multiple Correct Options

An op-amp has an open loop gain varying 100 to 120. The possible output voltages when V_input = 20m V, where the amplifier is ideal in all other respects and V_ios is input offset voltage