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Measurement and Instrumentation

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

 50 V.
 200 V.
 25 V.
 100 V.

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Measurement and Instrumentation
What is the expression for momentum?

 force × displacement
 change of velocity / time
 mass × velocity
 mass × acceleration

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Measurement and Instrumentation
Piezoelectronic accelerometer

 Should be used for low frequency.
 Should use a monitoring source at low input impedance.
 Has a low natural frequency.
 Should be used for high frequencies above 100 Hz.

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Measurement and Instrumentation
A permanent magnet moving coil ammeter is connected in 50 Hz a. c. Circuit in which 5A current is flowing. The meter will read

None of the listed here
5 A
0 A
2.5 A

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Measurement and Instrumentation
A DC A-h meter is rated for 15 A, 250 V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as

 3600 rev/KWh.
 1000 rev/KWh.
 960 rev/KWh.
 3750 rev/KWh.

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Measurement and Instrumentation
Kelvin’s double bridge is used to measure low resistance because

 effect of contact and lead resistance is eliminated.
 there is no thermo electric emf.
 it has high sensitivity.
 resistance variation due to temperature.

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