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GATE 2019: Electrical & Electronics Measurements Rapid Mini Mock

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Question 1

The magnitude of pen deflection is proportional to which of the following in PMMC writing system ?

Question 2

Why pole faces of U-shaped magnet are made concave in moving coil galvanometer?

Question 3

The range of medium resistance is

Question 4

In the figure, the value of resistor R is (25 + I/2) ohms, where I is the current in amperes. The current I is _____.

Question 5

A Galvanometer whose resistance is 40 Ohms deflected full-scale for a potential difference of 100mV across its terminals. How can it be converted into an ammeter of 5 ampere range?

Question 6

Two resistances with limiting values are;

and

is the limiting value of equivalent resistance if connected in parallel then

is _________.

Question 7

A copper resistance thermometer has a resistance of 10 Ω at 30 °C. What is the maximum temperature that it can measure if the maximum resistance of the thermometer is 16 Ω? The resistance temperature coefficient of copper is 0.00393 Ω/Ω- °C.

Question 8

A moving coil ammeter has a moving coil of dimensions 20 mm × 15 mm with 150 turns. If a current of 4 mA is applied to the coil, find the angular deflection (in degree) of the pointer. The flux density in the air gap is 1.6 × 10^-3 Wb/m² and the spring constant is 0.46 × 10^-6 Nm/rad.

Question 9

A multi-range dc voltmeter is to be constructed by using individual multiplier resistors. A moving coil meter with internal resistance 80 Ω is to be used, which gives a full scale deflection with voltage 20 V. Determine the value of the multiplier resistors required, if the ranges of the voltmeter are 0 – 50 V, 0 – 100 V and 0 – 500 V.

Question 10

A voltmeter having a sensitivity of 1 kΩ/V is connected across an unknown resistance in series with a milliammeter reading 80 V on 150 V scale. When the milliammeter draws 10 mA current, find the error due to the loading effect of the voltmeter (Neglect the resistance of the milliammeter)

Question 11

A basic D' Arsonval movement with a full scale deflection of 50 μA and internal resistance of 500 Ω is used as voltmeter. The value of the multiplier resistance needed to employ this meter to measure a voltage range of (0 - 10) V is given by