GATE EE topic:electrical-and-electronic-measurements PYQs & Answers — Page 2

Questions 11–20 of 21. Imported answers require independent review unless marked reviewed.

A non-ideal Si-based pn junction diode is tested by sweeping the bias applied across its terminals from −5 V to +5 V. The effective thermal voltage,

, for the diode is measured to be

mV. The resolution of the voltage source in the measurement range is 1 mV. The percentage uncertainty (rounded off to 2 decimal places) in the measured current at a bias voltage of 0.02 V is ______.

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The temperature of the coolant oil bath for a transformer is monitored using the circuit shown. It contains a thermistor with a temperature-dependent resistance,

, where

is the temperature in °C. The temperature coefficient,

, is

%/°C. Circuit parameters:

. The error in the output signal (in V, rounded off to 2 decimal places) at 150 °C is ________.

Diagram for Electrical Engineering question 53

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The total impedance of the secondary winding, leads, and burden of a 5 A CT is 0.01

. If the fault current is 20 times the rated primary current of the CT, the VA output of the CT is __________.

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A moving coil instrument having a resistance of 10

, gives a full-scale deflection when the current is 10 mA. What should be the value of the series resistance, so that it can be used as a voltmeter for measuring potential difference up to 100 V?

Your answerChoose one option.

990

9990

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Two wattmeter method is used for measurement of power in a balanced three-phase load supplied from a balanced three-phase system. If one of the watmeters reads half of the other (both positive), then the power factor of the load is

Your answerChoose one option.

0.532

0.632

0.707

0.866

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A 0-1 Ampere moving iron ammeter has an internal resistance of 50 mΩ and inductance of 0.1 mH. A shunt coil is connected to extend its range to 0-10 ampere for all operating frequencies. The time constant in milliseconds and resistance in mΩ of the shunt coil respectively are

Your answerChoose one option.

2, 5.55

2, 1

2.18, 0.55

11.1, 2

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Two resistors with nominal resistance values

and

have additive uncertainties

and

, respectively. When these resistances are connected in parallel, the standard deviation of the error in the equivalent resistance

Your answerChoose one option.

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A stationary closed Lissajous pattern on an oscilloscope has 3 horizontal tangencies and 2 vertical tangencies for a horizontal input with frequency 3 kHz. The frequency of the vertical input is

Your answerChoose one option.

1.5 kHz

2 kHz

3 kHz

4.5 kHz

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The slope and level detector circuit in a CRO has a delay of 100 ns. The start-stop sweep generator has a response time of 50 ns. In order to display correctly, a delay line of

Your answerChoose one option.

150 ns has to be inserted into the y-channel

150 ns has to be inserted into the x-channel

150 ns has to be inserted into both x and y channels

100 ns has to be inserted into both x and y channels

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The following measurements are obtained on a single phase load: V = 220 V ±1 %, I = 5.0 A ± 1% and W = 555 W ± 2 %. If the power factor is calculated using these measurements, the worst case error in the calculated power factor in percent is _____. (Give answer up to one decimal place.)

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GATE EE topic:electrical-and-electronic-measurements PYQs

Question 52

Question 53

Question 23

Question 32

Question 5

Question 27

Question 8

Question 9

Question 12

Question 23