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Measurement and Instrumentation

Measurement and Instrumentation
In a dynamometer wattmeter, the moving coil is the

None of the listed here
Potential coil
Current coil and potential coil
Current coil

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Measurement and Instrumentation
When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is

None of these
All right
Faulty
Short-circuited

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Measurement and Instrumentation
A DC potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18 V obtains balances at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf of test cell is

 1 V.
 1.34 V.
 1.5 V.
 1.7 V.

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Measurement and Instrumentation
For measuring an AC voltage by an AC potentiometer it is desirable that the supply for the potentiometer is taken from

 The same source as the unknown voltage.
 A battery.
 Any of above.
 A source other than the source of unknown voltage.

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

Power transformers
Potential transformers
Either of the above
Current transformers

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Measurement and Instrumentation
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 ?

 ± 1.5%
 ±3.5%
 ±0.5%
 ± 3.0%

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