ECE :: Measurements and Instrumentation
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The torque in induction wattmeters due to
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During testing of an energy meter, the energy recorded by meter was 0.05 kWh and correct energy was found to be 0.09 kWh. The error and correction respectively are
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Two resistances are : R1 = 36 Ω ± 1.89 Ω and R2 = 75 Ω ± 3.75 Ω. The sum R1 + R2 along with limiting error is
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An instrument of accuracy class 1 can have an error equal to
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In bridge circuit of figure, equivalent resistance between A and B is
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Assertion (A): The scale a PMMC ammeter is linear.
Reason (R): The deflecting torque of PMMC is proportional to current in the coil.
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Assertion (A): Moving iron instrument can be used on ac or dc.
Reason (R): In a moving iron instrument deflecting torque is proportional to square of current.
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A land line telemetry system is suitable for distance upto
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Use of high permeability core in moving iron instrument helps in
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