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Measurement and Instrumentation

Measurement and Instrumentation
For measurement of high direct voltage, one would use _____ voltmeter.

Hot wire
Moving iron
Electrostatic
PMMC

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Measurement and Instrumentation
The chemical effect of current is used in

None of these
C. ammeter
C. ammeter hour meter
C. energy meter

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Measurement and Instrumentation
A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be

 ± 6%
 ± 5%
 ± 8%
 ± 7%

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Measurement and Instrumentation
In a moving coil instrument, the deflecting torque is proportional to

Current
Squareroot of the current
Sine of the measurand
Square of the current

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Measurement and Instrumentation
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

360V and 240V
One of the meters out of the range and other 100V
400V and 200V
300V each

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Measurement and Instrumentation
A null type instrument as compared to a deflected type instrument has

 a lower sensitivity.
All of these
 a higher accuracy.
 a faster response.

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