GATE IN concept:voltage PYQs & Answers

Questions 1–10 of 16. Imported answers require independent review unless marked reviewed.

In a linear element, the measured current is 100 mA ± 2.5% and the measured voltage is 5 V ± 5%. Which of the following options show(s) the consumed power?

Your answerSelect all correct options. You can choose more than one.

(500 ± 37.5) mW

(500 ± 12.5) mW

500 mW ± 7.5%

500 mW ± 2.5%

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In a single-phase AC circuit, the power consumed by load resistance

for an excitation

is measured using a wattmeter. The same wattmeter is connected in two different topologies, Topology-A and Topology-B, as shown in the figure. Different branch currents and voltage drops are also marked in the figure. Among the following options, the condition that ensures low error in the wattmeter reading for both the topologies is

Diagram for Instrumentation Engineering question 21

Your answerChoose one option.

for Topology-A and

for Topology-B

for Topology-A and

for Topology-B

for Topology-A and

for Topology-B

for Topology-A and

for Topology-B

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A 3½ digit digital voltmeter has a specified accuracy of

. If it is used to measure 10 V DC voltage, the error in the measurement would be

Note: Accuracy of the digital voltmeter is expressed as ± (% of reading + digit).

Your answerChoose one option.

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An oscilloscope has an input resistance of 1 M

. A 10X passive attenuating probe is connected to it to increase the input voltage range as well as the effective input resistance. The effective input resistance, in M

, seen into the probe tip is

Your answerChoose one option.

0.9

9.1

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In the figure shown, assume

is the phase angle between the load current and the load voltage

is the phase angle by which pressure coil current lags the pressure coil voltage of the wattmeter

is the phase angle between currents in the pressure coil and the current coil of the wattmeter

is the phase angle of the voltage transformer

is the phase angle of the current transformer

When the load has a lagging phase angle of

, which one of the following options is correct?

Diagram for Instrumentation Engineering question 47

Your answerChoose one option.

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The full-scale range of the wattmeter shown in the circuit is 100 W. The turns ratio of the individual transformers are indicated in the figure. The RMS value of the ac source voltage

is 200 V. The wattmeter reading will be ______ W (rounded off to the nearest integer).

Diagram for Instrumentation Engineering question 34

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In the diagram shown, the frequency of the sinusoidal source voltage

is 50 Hz. The load voltage is 230 V (RMS), and the load impedance is

. The value of attenuator

. The multiplier output voltage

, where

and

are the inputs. The magnitude of the average value of the multiplier output

is __________ V (rounded off to one decimal place).

Diagram for Instrumentation Engineering question 61

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The bridge shown is balanced when

F, and

. The 2 kHz sine-wave generator supplies a voltage of 10 V

. The value of

(in millihenry) is ______ (round off to two decimal places)

Diagram for Instrumentation Engineering question 63

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In the Wheatstone bridge circuit shown,

and

. The switch is initially open and the voltage between the points C and D is

. Upon closing the switch at

, the resistance in the arm AD changes by an amount

, and the voltage between C and D changes by

. The sensitivity of the bridge (in volt/kilohm), defined as

, is ________ (round off to two decimal places)

Diagram for Instrumentation Engineering question 65

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In an ac main, the rms voltage

, rms current

and power

are measured as:

and

(errors are with respect to readings). The percentage error in calculating the power factor using these readings is

Your answerChoose one option.

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GATE IN concept:voltage PYQs

How to practice concept:voltage

Question 29

Question 21

Question 23

Question 26

Question 47

Question 34

Question 61

Question 63

Question 65

Question 5