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Basic Electrical Engineering: Star and Delta
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Basic Electrical Engineering: Star and Delta
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20 Questions

1. A three phase, balanced delta connected load of (4+j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current IR . Assume the phase sequence to be RYB.
2. The dynamometer wattmeter can be used to measure
3. In the question 4, the expression obtained for current (IB) is?
4. The change of frequency affects the circuit parameters of wattmeter connected to measure power of three-phase AC system
5. In the question 4, the expression obtained for current (IY) is?
6. In a delta-connected load, the relation between line voltage and the phase voltage is?
7. In the above question, the power in delta three-phase circuit is given by
8. Which of the following devices are required to measure three phase balance power?
9. The total power P measured in Y star three-phase circuit is given by
10. If the load impedance is Z∠Ø, the current (IR ) is?
11. In a balanced three-phase system-delta load, if we assume the line voltage is VRY = V∠0⁰ as a reference phasor. Then the source voltage VYB is?
12. Determine the power (kW) drawn by the load.
13. In the question 1, the source voltage VBR is?
14. Determine the phase current IY.
15. Which of the following error may arise in wattmeter if it is not compensated for the errors?
16. The reactive power can be measured with wattmeter when voltage across voltage coil is adjusted to be out of phase with the current by
17. Determine the phase current IB.
18. One-Wattmeter method is used to measure
19. Which of the following is methods is the commonest method of measuring three balanced or unbalanced power?
20. For a good 0.5 micro-farad paper capacitor, the ohm-meter reading should

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