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Mission ISRO 2019: Measurements Quiz 1

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Question 1

A moving coil voltmeter has a range of 0 – 10 V. In order to extend the range of the voltmeter to 0 – 50 V, a multiplier resistance must be added in series with the coil. The multiplier resistance should be:

Question 2

In order to have a high current sensitivity, the control-spring constant of the moving coil ammeter should be:

Question 3

The wiper of a rotational potentiometer can have a maximum angular displacement of 330 °. When an input of 150 V is applied to the potentiometer, the wiper makes an angular displacement of 55 °. Find the output of the potentiometer.

Question 4

Instrument transformers are known to introduce magnitude and phase errors in measurements. These are primarily due to

Question 5

A current of

is passed through the circuit shown in figure below. Determine the reading of electrostatic voltmeter (in Volt) across 1 mH inductor.

Question 6

Lissajous pattern on a oscilloscope, 7 vertical tangencies and 5 horizontal tangencies. If vertical frequency is 400 Hz, ________ Hz is horizontal frequency.

Question 7

The current in a circuit consist of a DC component of 10 A superimposed on a 50 Hz sinusoidal component of maximum value 10 A. The reading shown by a PMMC ammeter will be ?

Question 8

Analog inputs are converted to digital outputs using op-amps as comparators. Assuming a 5-bit digital output, the number of comparators required would be