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Measurement and Instrumentation

Measurement and Instrumentation
A thermo couple ammeter gives full scale deflection of 10 A, when it reads one fifth of the scale, the current will be

 5.78 A.
  4.47 A.
 2 A.
 4 A.

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Measurement and Instrumentation
Kelvin’s double bridge is used to measure low resistance because

 there is no thermo electric emf.
 it has high sensitivity.
 resistance variation due to temperature.
 effect of contact and lead resistance is eliminated.

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Measurement and Instrumentation
The inductance of a certain moving iron ammeter is expressed as L = 2+5θ-θ2 µH. The control spring torque is 2 × 10-6 Nm/radian. Find the deflection in radians for a current of 2A.

 1
 2
 4
 5

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Measurement and Instrumentation
To measure high frequency currents, we mostly use ______ ammeter.

Thermocouple
Dynamometer
Hot wire
Moving iron

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Measurement and Instrumentation
To measure ac as well as dc power, we use

Sometimes induction and sometimes dynamometer wattmeter
Induction wattmeter
None of the listed here
Dynamometer wattmeter

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Measurement and Instrumentation
The pressure coil of a wattmeter should be connected on the supply side of the current coil when

None of these
Load impedance is low
Supply voltage is low
Load impedance is high

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