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Measurement and Instrumentation

Measurement and Instrumentation
A moving coil permanent magnet instrument can be used as ______ by using a low resistance shunt.

Ballastic galvanometer
Flux meter
Ammeter
Voltmeter

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Measurement and Instrumentation
A meter has a full-scale deflection of 90o at a current of 1 A. The response of the meter is square law. Assuming spring control, the current for a deflection at 45o will be

 0.50 A.
 0.70 A.
 0.25 A.
 0.67 A.

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Measurement and Instrumentation
In a ballistic galvanometer, the deflecting torque is proportional to

Sine of measured
Square-root of current through coil
Square of current through coil
The current through coil

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Measurement and Instrumentation
How many time-base circuits does a dual face CRO can have?

 2.
 3.
 4.
 1.

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Measurement and Instrumentation
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is

120°
90°
30°
0°

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Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Reactive power of R phase
Power proportional to 3 phase power if the load is balanced
Active power of Y phase
Active power in R phase

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