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Measurement and Instrumentation

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

kW
VAR
Wh
kWh

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Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Power proportional to 3 phase power if the load is balanced
Active power of Y phase
Active power in R phase
Reactive power of R phase

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Measurement and Instrumentation
Which of the following meter is most suitable for measuring radio frequency currents?

  Thermocouple meter.
 Moving - coil meter.
 VTVM.
 Moving - iron meter.

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Measurement and Instrumentation
A CRO can display

Both AC and DC signals
Time invariant signals
AC signals
DC signals

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Measurement and Instrumentation
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is

30°
0°
120°
90°

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Measurement and Instrumentation
A 50 Hz bar primary CT has a secondary with 500 turns. The secondary supplies 5 A current into a purely resistive burden of 1Ω. The magnetizing ampere-turn is 200. The phase angle between the primary and secondary current is

 94.6o.
 175.4o.
  4.6o.
 85.4o.

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