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Measurement and Instrumentation

Measurement and Instrumentation
The form factor in AC is the ratio of

Peak value to average value
Rms value to average value
Peak value to rms value
Rms value to peak value

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Measurement and Instrumentation
Ratio of readings of two wattmeter connected to measure power in a balanced 3-phase load is 5:3 and the load is inductive. The power factor at load is

 0.917 lead.
 0.917 lag.
 0.6 lag.
 0.6 lead.

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Measurement and Instrumentation
Piezoelectronic accelerometer

 Should use a monitoring source at low input impedance.
 Has a low natural frequency.
 Should be used for low frequency.
 Should be used for high frequencies above 100 Hz.

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

Thermocouple
Hot wire
Moving iron
Dynamometer

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Measurement and Instrumentation
The meter constant of a single phase 240 V induction watthour meter is 400 revolutions per KWh. The speed of the meter disc for a current of 10 Amperes of 0.8 p.f lagging will be

 18.2 rpm.
 16.02 rpm.
 21.1 rpm.
  12.8 rpm.

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Measurement and Instrumentation
_______ is used to measure the flow of air around aeroplane.

 nucleus.
 Orifice.
 Venturimeter.
  Anemometer.

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MORE MCQ ON Measurement and Instrumentation

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