Question: Three wattmeters are used to measure power in a 3-phase balanced star connected load.
Answer:
MCQ: Three wattmeters are used to measure power in a 3-phase balanced star connected load.
Correct Answer:
A. The reading will be higher when the neutral point is used as the common point for wattmeter pressure coils.
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Related Questions
- 1. Two wattmeters can be used to measure power in a
- 2. In 2-wattmeter method for measurement of power in a star-connected 3 phase load, magnitude of the two wattmeter readings will be equal
- 3. The breaking torque provided by a permanent magnet in a single phase energy meter is proportional to the
- 4. The breaking torque provided by a permanent magnet in a single phase energy meter can be changed by :
- 5. In the single phase induction meter, in order to obtain true value of energy, the shunt magnet flux should lag behind the applied voltage by :
- 6. In an induction type of meter, maximum torque is produced when the phase angle, between the two fluxes is :
- 7. In an induction type meter, maximum torque is obtained when the parameters of rotating disc are _______Where R and X are respectively the resistance and reactance of eddy current paths in the disc.
- 8. In a single phase induction type energy meter, the lag adjustment is done :
- 9. In a circuit of single phase induction energy meter, the pressure coil lags the voltage by 88°, the errors while measuring power in two circuits having power factor of unity and 0.5 lagging are respectively are :
- 10. Phantom loading for testing of energy meters is used :
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