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GATE 2020 || Measurements || Quiz 3

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Question 1

A (0–50A) moving coil ammeter has a voltage drop of 0.1 V across its terminals at full scale deflection. The external shunt resistance (in milli ohms) needed to extend it's range (0–500A) is ________.

Question 2

A high swamping resistance is often connected in series with the coil of the ammeter. What is the purpose of using this swamping resistance?

Question 3

The inductance of a moving iron ammeter with a full scale deflection of 90 ° at 1.5 A, is given by the expression where θ is the deflection in radian from the zero position. Estimate the angular deflection of the pointer for a current of 1 A.

Question 4

Two types of connections of wattmeter pressure coil are shown in the figures below



the value of the wattmeter current coil resistance r, which makes the connection errors the same in the two cases is

Question 5

Determine the sensitivity of the dc voltmeter with voltage range 0 – 50 V. The internal resistance of meter is 100 Ω and the multiplier resistance is 900 Ω.

Question 6

A 6-bit R-2R ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity. ___ V is the output for 011100.
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Jan 8ESE & GATE EE