MEASUREMENT AND INSTRUMENTATION QUIZ

Which instrument has identical calibration for ac as well as dc values?

Moving iron type

Hot wire type

Induction type

Moving coil type

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The problem of Electrostatic coupling in a transformer is acute at

Low frequencies

Power frequencies

High frequencies

High load on the transformer

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Comparison methods are used

because they take least time in measurement.

because they are expensive.

because they are most simple.

when a high accuracy of measurement is required.

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Which amplifier in used in an electronic amplifier?

Power amplifier.

Differential amplifier.

Wideband amplifier.

Butter amplifer.

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The form factor in AC is the ratio of

Rms value to peak value

Peak value to rms value

Rms value to average value

Peak value to average value

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Dynamic errors are caused by

human error

instrument not responding fast

environmental error

observational error

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Electrostatic instruments are used as

Wattmeter only

Ammeters only

Both ammeter and voltmeter

Voltmeters only

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The spring material used in a spring control device should have the following property.

Should non magnetic

All of the listed here

Most be of low temperature co-efficient

Should have low specific resistance

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An average reading digital multimeter reads 10 V when fed a triangular wave, symmetric about the axis. For the same input, an rms reading meter will read

20√3.

10.

10√3.

20.

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The meter constant of an energy meter is 1500 rev/kWh, the disc makes 3000 revolution in a given time. The energy consumed is

4 kWh

2 kWh

3 kWh

1 kWh

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