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Measurement and Instrumentation

Measurement and Instrumentation
In a moving coil instrument, the deflecting torque is proportional to

Square of the current
Current
Sine of the measurand
Squareroot of the current

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Measurement and Instrumentation
A 10MHz CRO has

10MHz horizontal oscillator
10MHz supply frequency
10MHz vertical oscillator
5MHz sweep

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

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

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Measurement and Instrumentation
Which of the following instruments can be used to measure AC current only?

Moving iron ammeter
Permanent Magnet Type ammeter
Moving iron voltmeter
Induction type ammeter

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Measurement and Instrumentation
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

400V and 200V
360V and 240V
One of the meters out of the range and other 100V
300V each

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Measurement and Instrumentation
Purely mechanical instrument cannot be used for dynamic measurements because they have

All of these
 higher response time.
 high inertia.
 large time constant.

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