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Measurement and Instrumentation

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 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

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

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Measurement and Instrumentation
A rectifier type instrument is connected to 100VDC and is operated in the DC measuring module reads

90V
111V
100V
50V

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Measurement and Instrumentation
PMMC type instruments normally use

Eddy current damping
Fluid friction damping
Air friction damping
None of these

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

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Measurement and Instrumentation
Wagner earthing device is used to eliminate errors due to

None of these
Electrostatic coupling
Both A and B
Electromagnetic coupling

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