In a 3-phase system, two-wattmeter method is used to measure the power. If one of the wattmeters shows a negative reading and the other shows a positive reading, and the magnitude of the readings are not the same, then what will be the power factor (p.f.) of the load?

In a 3-phase system, two-wattmeter method is used to measure the power

1.	In a 3-phase system, two-wattmeter method is used to measure the power. If one of the wattmeters shows a negative reading and the other shows a positive reading, and the magnitude of the readings are not the same, then what will be the power factor (p.f.) of the load?
A.	0.0 < p.f. < 0.5
B.	0.5 < p.f. < 1.0
C.	1
D.	0.5
Answer» B. 0.5 < p.f. < 1.0

Discussion

No Comment Found

Related MCQs

In the two-wattmeter method of measuring 3-phase power, the wattmeters indicate equal and opposite readings when load power factor is
In case of power measurements by two wattmeter method in a balanced 3 – phase system with pure inductive load
An electric iron designed for 110 V AC supply was rated at 500 W. It was put across a 220 V supply. Assuming that at 110 V it supplied 500 W output (i.e. no losses) at the new voltage it will supply
A wattmeter is connected as shown in the figure. The wattmeter reads
An iron cored choke coil has an equivalent resistance of 4 Ω. It draws 10A from a single phase ac source of voltage 200 V, 50 Hz. Then, power consumed by the coil and its power factor respectively are:
Calculate the percentage error for a wattmeter which is so connected that the current coil is on the load side, The wattmeter has a current coil of 0.03Ω resistance and a pressure coil of 6000Ω resistance. It is also known that the load takes 20 A at a voltage of 220 V and 0.6 power factor.
In a balanced 3-phase 400V circuit, the line current is 115.5 A. When the power is measured by two wattmeter method, one meter reads 40 kW and the other zero. What is the power factor of the load
In a 3-phase system, two-wattmeter method is used to measure the power. If one of the wattmeters shows a negative reading and the other shows a positive reading, and the magnitude of the readings are not the same, then what will be the power factor (p.f.) of the load?
A three-phase 500 V motor load has a power factor of 0.4. Two wattmeters connected to measure the input read 20 kW and 10 kW. Find the reactive power (Q)
Power consumed by a balanced 3 – phase, 3 – wire load is measured by the two wattmeter method. The first wattmeter reads twice that of the second, then the load impedance angle in radians is –

In a 3-phase system, two-wattmeter method is used to measure the power. If one of the wattmeters shows a negative reading and the other shows a positive reading, and the magnitude of the readings are not the same, then what will be the power factor (p.f.) of the load?

Discussion

No Comment Found

Related MCQs

Reply to Comment