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Measurement and Instrumentation

Measurement and Instrumentation
A megger is usually

Moving iron type instrument
Electro-static type instrument
Hot-wire type instrument
Moving coil type instrument

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Measurement and Instrumentation
______ movement is most expensive.

None of the listed here
D'Arsonval movement
Dynamometer
Moving iron

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Measurement and Instrumentation
The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is

One ohm according to working standards
Standard ohm
One international ohm
One ohm according to SI units

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Measurement and Instrumentation
The electrical power to a megger is provided by

Ac generator
Permanent magnet dc generator
Any of the listed here
Battery

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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

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

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Measurement and Instrumentation
The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be

 1%
 1.2%
 0.5%
 1.5%

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