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Measurement and Instrumentation

Measurement and Instrumentation
A megger is usually

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

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Measurement and Instrumentation
Null type recorders are

 LVDT recorders.
 bridge recorders.
 any one of the above.
 potentiometric recorders.

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Measurement and Instrumentation
The ratio of change in output to the change in the input is called

 sensitivity
 repeatability
 resolution
 precision

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Measurement and Instrumentation
The circuit in figure is used to measure the power consumed by the load. The current coil and the voltage coil of the wattmeter have 0.02 Ω and 1000 Ω resistance respectively. The measured power compared to the load power will be

 0.2% less.
 0.4% less.
 0.2% more.
 0.4 more.

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Measurement and Instrumentation
Which one the following statements is correct? The application of the instrument in wrong manner in the procedure of measurement results in a/an

 systematic error
 random error
 gross error
 instrument error

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Measurement and Instrumentation
Ratio of readings of two wattmeter connected to measure power in a balanced 3-phase load is 5:3 and the load is inductive. The power factor at load is

 0.917 lead.
 0.917 lag.
 0.6 lead.
 0.6 lag.

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