MEASUREMENT AND INSTRUMENTATION QUIZ

The problem of Electrostatic coupling in a transformer is acute at

High load on the transformer

High frequencies

Power frequencies

Low frequencies

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YOUR ANSWER : ?

The watt hour meter is ______ instrument.

A transfer

An indicating

An integrating

A recording

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The EMF of Weston standard cell is measured using

Moving- iron meter

Moving-coil meter

Potentiometer

Digital Volt meter

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The pointer of an indicating instrument should be

Very light

Very heavy

None of the listed here

Either light or heavy

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Piezoelectronic accelerometer

Has a low natural frequency.

Should be used for low frequency.

Should be used for high frequencies above 100 Hz.

Should use a monitoring source at low input impedance.

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The smallest change in measured variable to which instrument will respond is

accuracy.

resolution.

sensitivity.

precision.

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To measure ac as well as dc power, we use

None of the listed here

Dynamometer wattmeter

Induction wattmeter

Sometimes induction and sometimes dynamometer wattmeter

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The resistance of a circuit is measured from the relation R= P/I2, where P is the power fed into the circuit and I is the current flowing through it. If the limiting errors in the measurement of power and current are respectively ± 1.0% and ± 1.0%, then what will be the limiting error in measurement of resistance ?

± 3.0%

±3.5%

±0.5%

± 1.5%

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YOUR ANSWER : ?

The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?

1 Ohm

49.99 Ohms

2 Ohms

1/49.99 ohms

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For handling greater currents induction watt-meters are used in conjunction with

Power transformers

Either of the above

Potential transformers

Current transformers

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