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Measurement and Instrumentation

Measurement and Instrumentation
Induction wattmeter can measure

Dc power only
None of the listed here
Ac power only
Both AC and DC

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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
A metal strain gauge has a gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10-5, the value of change of resistance in response to the strain is

 0.0024 Ohm.
 0.0012 Ohm.
 240 Ohm.
 120 Ohm.

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Measurement and Instrumentation
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

High
Low
Almost zero
None of the listed here

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Measurement and Instrumentation
Which of the following are integrating instruments?

Voltmeters
Wattmeters
Ammeters
Ampere hour and watt hour meters

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Measurement and Instrumentation
Commonly used instruments in power system measurement are

Moving coil or iron
Rectifier
Induction
Electrostatic

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