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Measurement and Instrumentation

Measurement and Instrumentation
Which one of the following units is a fundamental unit?

 Joule/sec
 Ampere
 Watt
 Newton

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Measurement and Instrumentation
In figure Z1 = 200∠60° ohm. Z2 = 400∠-90° ohm, Z3 = 300∠0° ohm. Then Z4 for bridge to be balanced is

 150∠30° ohm.
 600∠-150° ohm.
 300∠90° ohm.
 400∠-90° ohm.

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Measurement and Instrumentation
A PMMC instrument can be used as flux meter

By making control springs of large moment of inertia
By using a low resistance shunt
By using a high series resistance
By eliminating the control springs

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Measurement and Instrumentation
An Ohmmeter is a

None of the listed here
Moving coil instrument
Moving iron instrument
Dynamometer instrument

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Measurement and Instrumentation
A moving iron ammeter produces a full scale torque of 240 μNm with a deflection of 120° at a current of 10 A. The rate of change of self induction (μH/radian) of the instrument at full scale is

 114.6 μH/radian.
 12.0 μH/radian.
 4.8 μH/radian.
 2.0 μH/radian.

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

Hot wire type
Moving coil type
Moving iron type
Induction type

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