Test: Electronics - 3 - Physics MCQ

# Test: Electronics - 3 - Physics MCQ

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## 20 Questions MCQ Test GATE Physics Mock Test Series 2025 - Test: Electronics - 3

Test: Electronics - 3 for Physics 2024 is part of GATE Physics Mock Test Series 2025 preparation. The Test: Electronics - 3 questions and answers have been prepared according to the Physics exam syllabus.The Test: Electronics - 3 MCQs are made for Physics 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electronics - 3 below.
Solutions of Test: Electronics - 3 questions in English are available as part of our GATE Physics Mock Test Series 2025 for Physics & Test: Electronics - 3 solutions in Hindi for GATE Physics Mock Test Series 2025 course. Download more important topics, notes, lectures and mock test series for Physics Exam by signing up for free. Attempt Test: Electronics - 3 | 20 questions in 40 minutes | Mock test for Physics preparation | Free important questions MCQ to study GATE Physics Mock Test Series 2025 for Physics Exam | Download free PDF with solutions
Test: Electronics - 3 - Question 1

### For an n-p-n transistor connected as shown in figure VBE = 0.7 volts. Given that reverse saturation current of the junction at room temperature 300° AT is 10-13 A. the emitter current is

Detailed Solution for Test: Electronics - 3 - Question 1

*Answer can only contain numeric values
Test: Electronics - 3 - Question 2

### In the bistable circuit shown in the figure, the ideal OP- Amp lias saturation levels of ± 5 V. The value of R1 (in kΩ) that gives a hysteresis width of 500 mV is__________ (Answer should be an integer)

Detailed Solution for Test: Electronics - 3 - Question 2

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Test: Electronics - 3 - Question 3

### The circuit shown in the figure is

Detailed Solution for Test: Electronics - 3 - Question 3

i0 output current independent of Load and i0 ∝ V . Hence, voltage control current source.

Test: Electronics - 3 - Question 4

Let the magnitude of the gain in the inverting Op-Amp circuit shown be x with switch S1 open. When the switch is closed, the magnitude of gain becomes.

Detailed Solution for Test: Electronics - 3 - Question 4

Case - I: Switch open

Case - II:

*Answer can only contain numeric values
Test: Electronics - 3 - Question 5

Consider the circuit shown in the figure. Assuming VBE1 = VEB2 = 0.7V, the value of the dc voltage VC2 (in volt) is ___________ .

(Round off to one decimal place)

Detailed Solution for Test: Electronics - 3 - Question 5

Test: Electronics - 3 - Question 6

A Wein bridge oscillator is shown in figure, which of the following statements are true, if 'f' is the frequency of oscillation?

Detailed Solution for Test: Electronics - 3 - Question 6

The frequency of Wein bridge oscillator is given by
Put value & verify; we get the correct option is (a)

Test: Electronics - 3 - Question 7

In a voltage follower op-amp circuit, find the closed loop gain V0/Vs if the open loop gain = 2

Detailed Solution for Test: Electronics - 3 - Question 7

Test: Electronics - 3 - Question 8

The circuit shown in figure is best described as a

Detailed Solution for Test: Electronics - 3 - Question 8

CKT is voltage doubles circuit
⇒ Once capacitor charge it can't discarge

Test: Electronics - 3 - Question 9

In the shunt regulator shown below, the Vz 8.2 V and VBE = 0.7 V. The regulated output voltage V0 is

Detailed Solution for Test: Electronics - 3 - Question 9

KVL

Test: Electronics - 3 - Question 10

Let  denote the Exclusive OR (XOR) operation. Let '1' and '0' denote the binary constants. Consider the following Boolean expression for F over two variables P and Q :

The equivalent expression for F is

Detailed Solution for Test: Electronics - 3 - Question 10

We Know:

Test: Electronics - 3 - Question 11

In the Op-Amp circuit shown, assume that the diode current follows the equation I = Is exp (V/VT). For V, = 2V, V0 = V01 and for Vi = 4V, V0 = V02, The relationsliip between V01 and V02 is

Detailed Solution for Test: Electronics - 3 - Question 11

Logarithmic Amplifies
Case - I

Similarly Case - II

∴

Test: Electronics - 3 - Question 12

A regulated power supply, shown in figure below, lias an unregulated input (UR) of 15 volts and generates a regulated ouput. Use the component values shown in the figure.

The power dissipation across the transistor Q1 shown in the figure is

Detailed Solution for Test: Electronics - 3 - Question 12

Test: Electronics - 3 - Question 13

The output voltage of the regulated power supply shown in figure is

Detailed Solution for Test: Electronics - 3 - Question 13

Voltage divison Rule

*Answer can only contain numeric values
Test: Electronics - 3 - Question 14

In the circuit shown, assume that diodes D1 and D2 are ideal. In the steady-state condition, the average voltage Vab (in Volts) across the 0.5 μF capacitor is

Detailed Solution for Test: Electronics - 3 - Question 14

*Answer can only contain numeric values
Test: Electronics - 3 - Question 15

The figure shows a half-wave rectifier. The diode D is ideal. The average steady state current (inAmperes) through the diode is approximately____________

Detailed Solution for Test: Electronics - 3 - Question 15

Positive peak detector circuit

*Answer can only contain numeric values
Test: Electronics - 3 - Question 16

The amplifier circuit shown in the figure is implemented using a compensated operational amplier (OP-Amp), and has an open-loop voltage gain, A0 = 105 V/V and an open-loop cut-off frequency, fc = 8 Hz.

The voltage gain of the amplifier at 15 kHz. in V/V, is_______________
(Round off to two decimal places)

Detailed Solution for Test: Electronics - 3 - Question 16

" Put value"    Voltage divison Rule

Gain BW product = Gain BW
For open loop     product

*Answer can only contain numeric values
Test: Electronics - 3 - Question 17

Consider the circuit shown in the figure Assume base-to-emitter voltage VBE - 0.8 V. and common base current gain(α) of the transistor is unity.

The value of the collector-to-emitter voltage VCE(in volts) is_________________.

Detailed Solution for Test: Electronics - 3 - Question 17

Given α = 1

*Answer can only contain numeric values
Test: Electronics - 3 - Question 18

For the given circuit, value of the base current ( Ib) of the npn transistor will be___________mA.
(β is the current gain and assume Op-Amp as ideal).

(Round off to three decimal places)

Detailed Solution for Test: Electronics - 3 - Question 18

Test: Electronics - 3 - Question 19

Transform the following logic circuit (without expressing its switching function) into an equivalent logic circuit that employs only NAND gates each with 2-inputs.

Detailed Solution for Test: Electronics - 3 - Question 19

( 5 NAND Gate)

*Answer can only contain numeric values
Test: Electronics - 3 - Question 20

The number ofNAND sate required to implement y =  is__________

Detailed Solution for Test: Electronics - 3 - Question 20

Simplify, distributive law.

Total 2 NAND gate

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