Measurements and Instrumentation
A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is
Answer: C
.
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Which of these has a magnetic brake?
Answer: B
Braking torque, in an energy meter, is provided by a magnet.
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Assertion (A): A hot wire ammeter has a cramped scale.
Reason (R): The heat is proportional to square of current.
Answer: A
Since heating ∝ I2, scale is cramped.
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A voltmeter using thermocouples measures
Answer: A
Since the thermocouple is based on heating effect, rms value is measured
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The D'Arsonval- movement can be converted into audio frequency ac ammeter by adding a
Answer: D
Rectifier converts ac to dc which is measured by D'Arsonval meter.
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Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because
Answer: C
Since the circuit is not loaded, the accurate value of dc voltage is measured.
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The D'Arsonval- movement can be converted into audio frequency ac ammeter by adding a
Answer: D
Rectifier converts ac to dc which is measured by D'Arsonval meter.
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A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be
Answer: B
.
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As per BIS there are 6 accuracy classes of instruments.
Answer: B
There are 8 classes of accuracy as per BIS.
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In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
Answer: C
When p.f. is less than 0.5 (leading or lagging) one of the wattmeters reads negative.
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