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GATE 2022 : Electrical Measurement Revision Quiz

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Question 1

Consider a  DVM. The full range of DVM is 100 volts. What is the maximum possible value in volts read by DVM.

Question 2

Cable insulation resistance is found to be 250 MΩ using loss of charge method. The capacitor is initially charged to a value of 30V. After switch is opened, voltage across capacitor drops to 10V in 5 minutes. The value of capacitor used is

(Assume: ln (3) = 1.098)

Question 3

Consider the following statement regarding the controlling torque:
1) It is not present in power factor meter.
2) It opposes the deflecting torque.
3) It is provided by air friction or by fluid friction.
Which of these statements are correct?

Question 4

For the Lissajous pattern shown below, if the horizontal frequency is 54 Hz, then the value of vertical frequency will be

Question 5

Two wattmeters can be used to measure power in a

Question 6

A resistance R is measured using Ammeter-Voltmeter method using the circuit as shown in the figure below. The resistance of the ammeter is 0.1 ohm and that of voltmeter is 2000 ohms. If the ammeter reading is 2 A and voltmeter reading is 200 V, then the relative percentage error due to loading effect of voltmeter is __________%.

Question 7

The self-capacitance of a coil is measured by the resonating capacitor. The measurement gives the value of tuning capacitor as C1 = 750 pF at a frequency f1 = 2MHz. The second measurement at f2 = 4 MHz yields a new value of tuning capacitor C2 = 150 pF. The self-capacitance Cd will be

Question 8

The arms of a bridge abcd supplied with sinusoidal voltage, have the following values:

arm ab: A resistance of 100 Ω in parallel with a capacitance of 10 μF

arm bc : 450 Ω resistance

arm cd : 1200Ω resistance

arm da : A resistance R2 in series with a 5μF capacitance.

The frequency at which the bridge will be balanced is __________

Question 9

A current transformer having ratio 1250:5 A . The magnetizing and loss component of exciting current are 12A and 8A respectively. The secondary winding pf angle is 45°. What is the phase angle error?

Question 10

The power in a 3-ϕ, 3 wire balanced load system is measured by two wattmeter method. The reading of wattmeter A is 400 watts and wattmeter B is –100 watts. What will be the power factor of the system.

Question 11

An ohmmeter is designed for a 2 mA meter movement and a 5V battery. If the battery voltage decays to 4 V because of ageing, the resulting error at the hindrance on the ohmmeter scale is

Question 12

SAR type analog to digital converter given an analog input of 5V. The output of the converter is 10111001. The resolution of the converter is

Question 13

A (0 – 5) mA Ammeter with internal resistance of 500 Ω is used to design a DC voltmeter of full scale voltage of 50V. The value of require external resistance.

Question 14

A 500/5 A, 50 Hz current transformer has a bar primary. The secondary burden is pure resistance of 1 Ω and it draws a current of 5A, if magnetic core requires 250 AT for magnetisation, the percentage of ratio error is ?

Question 15

In a resistive circuit, a step input voltage of 12 V is applied to it. The pointer swings to a voltage of 12.4 V & then finally comes to rest at 12.12 V. Then calculate the percentage overshoot of final reading of voltmeter.
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Oct 10ESE & GATE EE