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Measurement and Instrumentation

Measurement and Instrumentation
Which of following is a vector quantity?

 Magnetic field intensity.
 Relative permeability.
 Magnetic potential.
 Flux density.

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Measurement and Instrumentation
Electrostatic instruments are normally used for

Low voltage measurements
Low current measurements
High current measurements
High voltage measurements

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Measurement and Instrumentation
A moving iron ammeter produces a full scale torque of 240 μNm with a deflection of 120° at a current of 10 A. The rate of change of self induction (μH/radian) of the instrument at full scale is

 4.8 μH/radian.
 114.6 μH/radian.
 2.0 μH/radian.
 12.0 μH/radian.

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Measurement and Instrumentation
What is the name of physical quantities which are independent of each other?

 Numerical quantity
 Derived quantity
None of these
 Fundamental quantity

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Measurement and Instrumentation
A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of

 Contact resistance.
 Resistance of connecting leads.
 Thermoelectric emfs.
 All of above.

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Measurement and Instrumentation
The transfer instrument which is used for standardization of a polar type AC potentiometer is

 a moving coil instrument.
 an electrostatic instrument.
 a dynamometer instrument.
 a thermal instrument.

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