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Measurement and Instrumentation

Measurement and Instrumentation
A thermo couple ammeter gives full scale deflection of 10 A, when it reads one fifth of the scale, the current will be

 4 A.
  4.47 A.
 2 A.
 5.78 A.

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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

3 kWh
2 kWh
4 kWh
1 kWh

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Measurement and Instrumentation
The coil of a moving iron instrument has a resistance of 500 ohm and inductance of 1 H. It reads 250 V when a 250 V DC is applied. It series resistance is 2000 ohms its reading when fed by 250 V, 50 Hz AC will be

 250 V.
 260 V.
 248 V.
 252 V.

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Measurement and Instrumentation
For measuring an AC voltage by an AC potentiometer it is desirable that the supply for the potentiometer is taken from

 A source other than the source of unknown voltage.
 Any of above.
 The same source as the unknown voltage.
 A battery.

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Measurement and Instrumentation
A single phase load is connected between R and Y terminals of a 415 V, symmetrical, 3-phase, 4 wire system with phase sequence RYB. A wattmeter is connected in the system as shown in figure. The power factor of the load is 0.8 lagging. The wattmeter will read

  - 597 W.
 + 597 W.
 - 795 W.
 + 795 W.

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Measurement and Instrumentation
The errors mainly caused by human mistakes are

  gross error.
 systematic error.
 instrumental error.
 observational error.

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