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Measurement and Instrumentation

Measurement and Instrumentation
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?

0.84
0.65
1
0.73

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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

 0.70 A.
 0.67 A.
 0.50 A.
 0.25 A.

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Measurement and Instrumentation
Unit of deflection sensitivity of a CRO is

 mm per mV.
 mm / V.
 V / mm.
 meter / volt.

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 2.24) A
 (400 ± 1.5) A
 (400 ± 3) A
 (400 ± 1) A

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Measurement and Instrumentation
Induction wattmeter can measure

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

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured I1 = 150 ± 3A , I2 = 250 ± 4 A, where the limits of error are given as standard deviations. I is measured as

 (400 ± 1) A
 (400 ± 3) A
 (400 ±5) A
 (400 ± 2.24) A

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