The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Reactive power of R phase

Active power of Y phase

Power proportional to 3 phase power if the load is balanced

Active power in R phase

Reactive power of R phase

Active power of Y phase

Power proportional to 3 phase power if the load is balanced

Active power in R phase

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Measurement and Instrumentation
The expected value of the voltage across a resistor is 80 V, and the measured value is 79 V. What is the percentage error and relative accuracy of the measurement ?

1.25% & 98.25%

1.25% & 98.75%

1.5% & 98.75%

1.5% & 99%

1.25% & 98.25%

1.25% & 98.75%

1.5% & 98.75%

1.5% & 99%

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Measurement and Instrumentation
A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be

± 7%

± 6%

± 8%

± 5%

± 7%

± 6%

± 8%

± 5%

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Measurement and Instrumentation
Null type recorders are

any one of the above.

potentiometric recorders.

bridge recorders.

LVDT recorders.

any one of the above.

potentiometric recorders.

bridge recorders.

LVDT recorders.

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Measurement and Instrumentation
A thermometer having first order dynamics is subjected to a sudden temperature change of 30oc to 150oc. If it has he time constant of 5 sec, what temperature will be indicated by after 5 sec?

150o.

63.25o.

105.6o.

30o.

150o.

63.25o.

105.6o.

30o.

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

Both A and R are true and R is correct explanation of A.

A is ture and R is false.

Both A and R are true and R is not correct explanation of A.

A is false and R is ture.

Both A and R are true and R is correct explanation of A.

A is ture and R is false.

Both A and R are true and R is not correct explanation of A.

A is false and R is ture.

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Measurement and Instrumentation

Measurement and Instrumentation The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Measurement and Instrumentation The expected value of the voltage across a resistor is 80 V, and the measured value is 79 V. What is the percentage error and relative accuracy of the measurement ?

Measurement and Instrumentation Null type recorders are

Measurement and Instrumentation A thermometer having first order dynamics is subjected to a sudden temperature change of 30oc to 150oc. If it has he time constant of 5 sec, what temperature will be indicated by after 5 sec?

Measurement and Instrumentation Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Measurement and Instrumentation
The expected value of the voltage across a resistor is 80 V, and the measured value is 79 V. What is the percentage error and relative accuracy of the measurement ?

Measurement and Instrumentation
Null type recorders are

Measurement and Instrumentation
A thermometer having first order dynamics is subjected to a sudden temperature change of 30oc to 150oc. If it has he time constant of 5 sec, what temperature will be indicated by after 5 sec?

Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.