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Measurement and Instrumentation

Measurement and Instrumentation
A megger is usually

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

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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
 5.0 mm/Ω
 0.8 mm/Ω
 0.4 mm/Ω

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Measurement and Instrumentation
Consider the following statements : In a measuring instrument, 1. Linearity is more important than sensitivity. 2. High precision indicates high accuracy 3. Accuracy cannot be better than resolution. Of these statements

 1 and 2 are correct
 1 and 3 are correct
 1, 2 and 3 are correct
 2 and 3 are correct

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Measurement and Instrumentation
When a potentiometer is used for measurement of voltage of an unknown source, the power consumed in the circuit of the unknown source under null condition is

 high.
 very high.
 small.
 ideally zero.

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Measurement and Instrumentation
What is the approximate input impedance of a CRO?

 0
 100 MΩ
 1 MΩ
 10 MΩ

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Measurement and Instrumentation
A spring-controlled moving iron voltmeter draws a current of 1 mA for full scale value of 100V. If it draws a current of 0.5 mA, the meter reading is

 200 V.
 50 V.
 25 V.
 100 V.

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