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Measurement and Instrumentation

Measurement and Instrumentation
For the AC bridge circuit shown in figure at balance the value of Rd will be

 (Rb/Rc).Ra.
 (Ra/Rc).Rb.
 (Rc/Ra).Rb.
 (Rc/Rb).Ra.

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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

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

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Measurement and Instrumentation
In a wheatstone bridge, a change of 6 Ω in the unknown arm of bridge is required to produce a change in deflection of 2.4 mm of the galvanometer. The sensitivity is

 2.5 mm/Ω
 0.4 mm/Ω
 0.8 mm/Ω
 5.0 mm/Ω

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Measurement and Instrumentation
A megger is usually

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

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Measurement and Instrumentation
Comparison methods are used

 because they are most simple.
 because they are expensive.
 because they take least time in measurement.
 when a high accuracy of measurement is required.

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Measurement and Instrumentation
The best type of meter moment is ______ moment.

Iron- vane
D'Arsonval
Dynamometer
None of the listed here

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