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Measurement and Instrumentation

Measurement and Instrumentation
In a megger controlling torque is provided by

Spring
Gravity
Coil
Eddy current

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Measurement and Instrumentation
A PMMC instrument can be used as flux meter

By making control springs of large moment of inertia
By eliminating the control springs
By using a low resistance shunt
By using a high series resistance

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Measurement and Instrumentation
Which of the following instruments can be used to measure AC current only?

Induction type ammeter
Moving iron ammeter
Permanent Magnet Type ammeter
Moving iron voltmeter

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Measurement and Instrumentation
Resistances can be measured with the help of

Ohmmeters and resistance bridges
Wattmeters
Ammeters
Voltmeters

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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.

 5
 4
 2
 1

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Measurement and Instrumentation
Two capacitance, C1 = 150 ± 2.4µF and C2 = 120 ± 1.5 µF are connected in parallel. What is the limiting error of the resultant capacitance C (in µF) ?

 2.4µF
 1.5µF
 0.9µF
 3.9µF

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