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Measurement and Instrumentation

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

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

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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

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

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Measurement and Instrumentation
When using ohmmeter, applied voltage is to be disconnected from the circuit because

Current will decrease resistance
None of these
The ohmmeter has its own internal battery
Voltage source will increase resistance

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Measurement and Instrumentation
The pointer of an indicating instrument is generally made of _______

Copper
Soft steel
Silver
Aluminium

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Measurement and Instrumentation
For measuring a very high resistance we should use

Megger
None of the listed here
Kelvin's double bridge
Wheat stone bridge

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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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