Choose the correct statement regarding two watt-meter method for power measureme

Question

Choose the correct statement regarding two watt-meter method for power measurements in 3-phase circuit.

Options:

A . When power factor is unity, one of the wattmeters reads zero

B . When the readings of the two watt-meters are equal but opposite sign, the power factor is zero

C . Power can be measured using two watt-meter method only for star connected 3-phase circuit

D . When two watt-meters show identical readings, the power factor is 0.5

Answer: Option B
Answer: (b).When the readings of the two watt-meters are equal but opposite sign, the power factor is zero

Was this answer helpful ?

Next Question

More Questions on This Topic :

Question 1. The meter constant of a single-phase, 230 V induction watt-meter is 600 rev/kW-h. The speed of the meter disc for a curr....of 15 A at 0.8 power factor lagging will be?

Question 2. In the measurement of 3-phase power by 2 watt-meter method, if the 2 watt-meter readings are equal, the power factor of ....readings are equal, the power factor of the circuit is?

Question 3. A coil (which can be modelled as a series RL circuit) has been designed for high Q performance. The voltage is rated at ....of Q factor and the active power P will be?

Question 4. Two watt-meters, which are connected to measure the total power on a three-phase system supplying a balanced load, read ....20.5 kW and -3.5 kW respectively. The total power is?

Question 5. A circuit is used to measure the power consumed by the load. The current coil and the voltage coil of the watt-meter hav....measured power (as compared to the load power) will be?

Question 6. The line to line input voltage to the 3-phase, 50 Hz, AC circuit, is 100 V rms. Assuming that the phase sequence is RYB;....that the phase sequence is RYB; the watt-meters would read?

Question 7. A sampling watt-meter is used to measure the average power of a load. The peak to peak voltage of the square wave is 10 ....wave of 5A p-p. The reading in watt will be?

Question 8. A 3-phase, 600 V motor, the load having 0.6 power factor uses two watt-meter to measure the power. If the power measured....45 kW, then the reading of each instrument will be?

Question 9. The meter constant of a single-phase, 100 V induction watt-meter is 600 rev/kW-h. The speed of the meter disc for a curr....of 15 A at 0.8 power factor lagging will be?

Question 10. Pressure coil of a wattmeter ________....

Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)

Direction Sense Test Part 1 Reasoning (Hindi)

Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE

Cube & Cuboid Part 1 Reasoning (Hindi)

Data Interpretation (DI) Basic Concept Reasoning (Hindi)

Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)

Sail E0 free webinar Webinars

Real Numbers Part 7 Class 10 Maths

Real Numbers Part 1 Class 10 Maths

Polynomials Part 1 Class 10 Maths

Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI

Tabulation - Test Paper 2 Data Interpretation Reasoning & DI

Test Paper 1 Direction Sense Test Reasoning & DI

ICA , RDIC,GFM Free Modal Test Paper - Non - Technical Branch Old Syllabus 2022 - SAIL Junior Officer E0

GFM Combined 1 Free Revision Test SAIL JO E-0