Measurements and Instrumentation
Loss of charge method is suitable for medium resistances.
Answer: B
It is suitable for high resistances.
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The household energy meter is
Answer: C
It integrates energy over a period of time.
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An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is
Answer: D
.
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A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is
Answer: C
Resolution is the smallest change in the quantity being measured which will cause an observable change in output. In this case it is 1 mV.
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Electrostatic voltmeter is suitable only for low voltages.
Answer: B
It is suitable for high voltage.
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A moving iron voltmeter reads 250 V when connected to 250 V dc. If connected to 250 V 50 Hz, the voltmeter reading is likely to be
Answer: C
The inductance of coil will allow slightly less ac current. Hence reading slightly less.
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A moving coil instrument has a resistance of 0.5 Ω and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be
Answer: B
.
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The speed transducer using a drag cup rotor has the main advantage of
Answer: B
A drag cup rotor has low inertia. Therefore it requires little amount of energy.
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Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?
Answer: D
When p.f. is zero, active power is zero and the two redaings are equal and opposite.
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