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

One of the wattmeter connections will have to be reversed

Pressure coil of the wattmeter will become ineffective.

Both give the same readings

One of the wattmeters will read zero

One of the wattmeter connections will have to be reversed

Pressure coil of the wattmeter will become ineffective.

Both give the same readings

One of the wattmeters will read zero

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Measurement and Instrumentation
A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

± 0.045

± 0.056

± 0.054

± 0.065

± 0.045

± 0.056

± 0.054

± 0.065

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Measurement and Instrumentation
______ movement is most expensive.

Moving iron

None of the listed here

Dynamometer

D'Arsonval movement

Moving iron

None of the listed here

Dynamometer

D'Arsonval movement

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

(400 ± 1.5) A

(400 ± 2.24) A

(400 ± 1) A

(400 ± 3) A

(400 ± 1.5) A

(400 ± 2.24) A

(400 ± 1) A

(400 ± 3) A

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Measurement and Instrumentation
Commonly used instruments in power system measurement are

Electrostatic

Induction

Rectifier

Moving coil or iron

Electrostatic

Induction

Rectifier

Moving coil or iron

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Measurement and Instrumentation
The maximum percentage error in the sum of two voltage measurements when V1 = 100V ± 1% and V2 = 80V ± 5% is

± 6%

± 2.8%

± 3%

± 4%

± 6%

± 2.8%

± 3%

± 4%

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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 set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

Measurement and Instrumentation ______ movement is most expensive.

Measurement and Instrumentation The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

Measurement and Instrumentation Commonly used instruments in power system measurement are

Measurement and Instrumentation The maximum percentage error in the sum of two voltage measurements when V1 = 100V ± 1% and V2 = 80V ± 5% is

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 set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

Measurement and Instrumentation
______ movement is most expensive.

Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

Measurement and Instrumentation
Commonly used instruments in power system measurement are

Measurement and Instrumentation
The maximum percentage error in the sum of two voltage measurements when V1 = 100V ± 1% and V2 = 80V ± 5% is