GATE IN Digital Electronics PYQs & Answers — Page 2

Questions 11–20 of 57. Imported answers require independent review unless marked reviewed.

A 3-bit DAC is implemented using ideal opamp and switches as shown in the figure. Each of the switches gets closed when its corresponding digital input is at logic 1. For a digital input of 110, the resistance

seen from the reference source and the current

, are

Diagram for Instrumentation Engineering question 43

Your answerChoose one option.

and

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A signal

V is applied to the circuit consisting of a switch S and capacitor C = 0.1

F, as shown in the figure. The output

of the circuit is fed to an ADC having an input impedance consisting of a 10 M

resistance in parallel with a 0.1

F capacitor. If S is opened at

s, the value of

s will be ______ V (rounded off to two decimal places).

Note: Assume all components are ideal.

Diagram for Instrumentation Engineering question 64

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Among the given options, the simplified form of the Boolean function

Your answerChoose one option.

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In the figure shown, the positive edge triggered D flip-flops are initially reset to Q = 0. The logic gates and the multiplexers have no propagation delay. After reset, a train of clock pulses (CLK) are applied. The logic states of the inputs DIN, S and the clock pulses are also shown in the figure. Assuming no timing violations, the sequence of output Y from the 3rd clock to the 5th clock,

Diagram for Instrumentation Engineering question 42

Your answerChoose one option.

001

010

000

011

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An ADC has a full scale voltage of 1.4 V, resolution of 200 mV, and produces binary output data. The input signal of the ADC has a bandwidth of 500 MHz, and it samples the data at the Nyquist rate. The parallel data output is converted to a serial bit stream using a parallel-to-serial converter. The data rate at the output of the parallel-to-serial converter is ____ Gbps (rounded off to nearest integer).

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In the figure shown, S_W is a switch whose position changes from 1 to 0 when V_C changes from logic HIGH to LOW and vice versa. The bandwidth of the permanent magnet moving coil (PMC) type voltmeter is 1 Hz. If V_sense = 2 sin(4000πt) V and V_ref = 4 sin(2000πt) V, the voltmeter reading is ______ V (rounded off to nearest integer).

Note: Assume all components are ideal.

Diagram for Instrumentation Engineering question 60

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The table shows the present state Q(t), next state Q(t+1), and the control input in a flip-flop. Identify the flip-flop.

Q (t)	Q (t+1)	Input
0	0	0
0	1	1
1	0	1
1	1	0

Your answerChoose one option.

T flip-flop

D flip-flop

SR flip-flop

JK flip-flop

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Match the Exclusive-OR (XOR) operations (i) to (iv) with the results (p) to (s), where X is a Boolean input.

(i)

; (ii)

; (iii)

; (iv)

(p) 1; (q) 0; (r)

; (s)

Your answerChoose one option.

(i) - (q), (ii) - (r), (iii) - (s), (iv) - (p)

(i) - (q), (ii) - (r), (iii) - (p), (iv) - (s)

(i) - (p), (ii) - (s), (iii) - (q), (iv) - (r)

(i) - (q), (ii) - (p), (iii) - (s), (iv) - (r)

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Choose the fastest logic family among the following:

Your answerChoose one option.

Transistor-Transistor Logic

Emitter-Coupled Logic

CMOS Logic

Resistor-Transistor Logic

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The simplified form of the Boolean function

with the minimum number of terms and smallest number of literals in each term is_________.

Your answerChoose one option.

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GATE IN Digital Electronics PYQs

Question 43

Question 64

Question 16

Question 42

Question 58

Question 60

Question 16

Question 17

Question 22

Question 40