For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

Both give the same readings

Pressure coil of the wattmeter will become ineffective.

One of the wattmeter connections will have to be reversed

One of the wattmeters will read zero

Both give the same readings

Pressure coil of the wattmeter will become ineffective.

One of the wattmeter connections will have to be reversed

One of the wattmeters will read zero

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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

+ 795 W.

- 597 W.

- 795 W.

+ 597 W.

+ 795 W.

- 597 W.

- 795 W.

+ 597 W.

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Measurement and Instrumentation
_______ instruments are those which measure the total quantity of the electricity delivered in a particular time.

Recording

Absolute

Integrating

Indicating

Recording

Absolute

Integrating

Indicating

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Measurement and Instrumentation
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?

1

0.65

0.84

0.73

1

0.65

0.84

0.73

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Measurement and Instrumentation
A potentiometer may be used for

Measurrment of resistance

Measurement of current

All of the listed here

Calibration of ammeter

Measurrment of resistance

Measurement of current

All of the listed here

Calibration of ammeter

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Measurement and Instrumentation
A 0 - 200 V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 50 V. What is the limiting error?

4%

5%

3%

2%

4%

5%

3%

2%

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Measurement and Instrumentation

Measurement and Instrumentation For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

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

Measurement and Instrumentation _______ instruments are those which measure the total quantity of the electricity delivered in a particular time.

Measurement and Instrumentation One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?

Measurement and Instrumentation A potentiometer may be used for

Measurement and Instrumentation A 0 - 200 V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 50 V. What is the limiting error?

Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

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

Measurement and Instrumentation
_______ instruments are those which measure the total quantity of the electricity delivered in a particular time.

Measurement and Instrumentation
One single phase wattmeter operating on 230V and 5A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. What is the power factor of the land?

Measurement and Instrumentation
A potentiometer may be used for

Measurement and Instrumentation
A 0 - 200 V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 50 V. What is the limiting error?