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Measurement and Instrumentation

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
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

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

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Measurement and Instrumentation
How many time-base circuits does a dual face CRO can have?

 4.
 2.
 1.
 3.

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Measurement and Instrumentation
The moving coil-meters, damping is provided by

 eddy current disk.
 the coil spring attached to the moving.
 the aluminium frame of the coil.
 damping vane in the airtight chamber.

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Measurement and Instrumentation
If the instrument is to have a wide range, the instrument should have

Linear scale
Logarithmic scale
Exponential scale
Square-law scale

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Measurement and Instrumentation
The maximum percentage error in the sum of two voltage measurements when V1 = 100V ± 1% and V2 = 80V ± 5% is

 ± 6%
 ± 2.8%
 ± 4%
 ± 3%

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