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Measurement and Instrumentation

Measurement and Instrumentation
Which of the following are integrating instruments?

Ampere hour and watt hour meters
Ammeters
Wattmeters
Voltmeters

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Measurement and Instrumentation
Deflection method direct measurements are most widely used as these are

 least time consuming.
 most simple.
 most accurate.
 most simple and least time consuming.

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Measurement and Instrumentation
To measure the flux, devices used are based on

Piezo-electric effect
Photo-voltaic effect
Hall effect
Voltaic effect

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Measurement and Instrumentation
The meter constant of an energy meter is 1500 rev/kWh, the disc makes 3000 revolution in a given time. The energy consumed is

2 kWh
3 kWh
1 kWh
4 kWh

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Measurement and Instrumentation
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken

From the same source as the unknown voltage
From a source which is not the same as the unknown voltage
From a battery
Any of the above

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Measurement and Instrumentation
A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

 100 W.
 25 W.
  0 W.
 50 W.

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MORE MCQ ON Measurement and Instrumentation

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