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Measurement and Instrumentation

Measurement and Instrumentation
Electrostatic instruments are used as

Wattmeter only
Ammeters only
Voltmeters only
Both ammeter and voltmeter

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Measurement and Instrumentation
The errors introduced by an instrument fall in which category ?

 Systematic errors
 Random errors
 Gross errors
 Environmental errors

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Measurement and Instrumentation
In a portable instrument , the controlling torque is provided by

All of the listed here
Spring
Eddy currents
Gravity

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Measurement and Instrumentation
Induction type single phase energy meters measure electric energy in

Wh
kWh
VAR
kW

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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

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

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Measurement and Instrumentation
When checked with an ohm meter an open resistor reads

  zero.
  low but not zero.
  infinite.
  high but within tolerance.

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