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Measurement and Instrumentation

Measurement and Instrumentation
What are the SI units of mass, length and time respectively?

 g, cm and s.
 kg, cm and s.
 kg, m and s.
 g, m and s.

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Measurement and Instrumentation
To measure high frequency currents, we mostly use ______ ammeter.

Thermocouple
Hot wire
Dynamometer
Moving iron

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Measurement and Instrumentation
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?

2 Ohms
49.99 Ohms
1 Ohm
1/49.99 ohms

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Measurement and Instrumentation
A metal strain gauge has a gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10-5, the value of change of resistance in response to the strain is

 240 Ohm.
 0.0024 Ohm.
 120 Ohm.
 0.0012 Ohm.

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Measurement and Instrumentation
The problem of Electrostatic coupling in a transformer is acute at

Power frequencies
High frequencies
Low frequencies
High load on the transformer

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Measurement and Instrumentation
When the pointer of an indicating instrument comes to rest in the final deflected position, ______

Only controlling torque acts
Both deflecting and controlling torques act
Only deflecting torque acts
None of the listed here

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