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Measurement and Instrumentation

Measurement and Instrumentation
Which of following are needed both for protection and metering?

 Power factor meters.
 Energy meter.
 Instrument transformer.
 Wattmeters.

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Measurement and Instrumentation
The adjustment of position of shading bands, in an energy meter is done to provide

Creep compensation
None of the listed here
Friction compensation
Breaking torque

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Measurement and Instrumentation
The errors introduced by an instrument fall in which category ?

 Random errors
 Systematic errors
 Gross errors
 Environmental errors

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Measurement and Instrumentation
The given figure shows wein bridge connection for frequency measurement. C and R are variables and gang together. For balanced condition the expression for frequency is f = 1/2πCR when

 R1 = 2R2.
 R1 = 3R2.
 R1 = R2/2.
 R1 = R2.

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Measurement and Instrumentation
In a wheatstone bridge, a change of 6 Ω in the unknown arm of bridge is required to produce a change in deflection of 2.4 mm of the galvanometer. The sensitivity is

 0.4 mm/Ω
 0.8 mm/Ω
 5.0 mm/Ω
 2.5 mm/Ω

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Measurement and Instrumentation
The difference between the measured value and the true value is called

 probable error
 relative error
 absolute error
 gross error

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