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Measurement and Instrumentation

Measurement and Instrumentation
Which of the following are integrating instruments?

Voltmeters
Ampere hour and watt hour meters
Ammeters
Wattmeters

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Measurement and Instrumentation
The resistance of a circuit is found by measuring current flowing and the power fed into the circuit. If the limiting errors in the measurement of power and current are ± 1.5% and ± 1.0% respectively, the limiting error in the measurement of resistance

 ± 2.5%
 ± 1%
 ± 1.5%
 ± 3.5%

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

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

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Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Power proportional to 3 phase power if the load is balanced
Active power of Y phase
Active power in R phase
Reactive power of R phase

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Measurement and Instrumentation
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be

100Hz
500Hz
1kHz
50Hz

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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

0 A
None of the listed here
5 A
2.5 A

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