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Instrumentation Engineering

GATE IN concept:zener-diode PYQs

Build your understanding with focused practice from past exam papers.

How to practice concept:zener-diode

Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.

GATE IN syllabus

Questions 1–7 of 7. Imported answers require independent review unless marked reviewed.

Topic practice 7 questionsPage 1 of 1

Question 35

Open question
INNAT1 markNeeds review
In the circuit shown, assume that the BJT in the circuit has very high

and

V, and the Zener diode has

V. The current

through the LED is __________ mA (rounded off to two decimal places).
Diagram for Instrumentation Engineering question 35


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Question 23

Open question
INNAT1 markNeeds review
Consider the circuit shown in the figure.
Diagram for Instrumentation Engineering question 23

The CMOS digital logic circuit has infinite input impedance. Assume the opamp is ideal. A 1.8 V Zener diode with a minimum Zener current of 2 mA is used. The corresponding maximum value of resistance

is ______ kΩ (rounded off to one decimal place).

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Question 31

Open question
INNAT1 markNeeds review
A Zener diode is used as a 4 V voltage regulator in the circuit shown. Given that the diode requires a minimum current of 4 mA for voltage regulation, the maximum current (in milliamperes) permitted to flow through the load

is ______ (round off to one decimal place)
Diagram for Instrumentation Engineering question 31


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Question 7

Open question
INMCQ1 markNeeds review
If the diodes in the circuit shown are ideal and the breakdown voltage

of the Zener diode is 5 V, the power dissipated in the 100

resistor (in watts) is ____.
Diagram for Instrumentation Engineering question 7

Your answerChoose one option.

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Question 11

Open question
INMCQ1 markNeeds review
The correct biasing conditions for typical operation of light emitting diodes, photodiodes, Zener diodes are, respectively
Your answerChoose one option.

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Question 40

Open question
INNAT2 marksNeeds review
In the given relaxation oscillator, the opamps and the zener diodes are ideal. The frequency (in kHz) of the square wave output

is _____.
Diagram for Instrumentation Engineering question 40


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Question 44

Open question
INNAT2 marksNeeds review
The circuit of a Schmitt trigger is shown in the figure.
Diagram for Instrumentation Engineering question 44

The zener-diode combination maintains the output between

. The width of the hysteresis band is __________ V.

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