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Measurement and Instrumentation

Measurement and Instrumentation
Relative error is same as

None of these
 ratio of absolute error and true value.
 absolute error.
 true error.

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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
The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be

 1.2%
 1%
 1.5%
 0.5%

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Measurement and Instrumentation
A DC potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18 V obtains balances at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf of test cell is

 1.7 V.
 1.5 V.
 1 V.
 1.34 V.

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Measurement and Instrumentation
Deflection method direct measurements are most widely used as these are

 least time consuming.
 most simple.
 most accurate.
 most simple and least time consuming.

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Measurement and Instrumentation
The multiplier and the meter coil in a voltmeter are in

Series
None of the listed here
Parallel
Series-parallel

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