1. |
For measuring positive, negative and zero sequence voltages in a system, the reference is taken as
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Answer:
Option (d) |
2. |
A system is said to be effectively grounded if its
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Answer:
Option (d) |
3. |
For complete protection of a 3-phase line
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Answer:
Option (d) |
4. |
The per unit impedance of a circuit element is 0.15. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be
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Answer:
Option (c) |
5. |
For a star-delta transformer with star-side grounded, the zero sequence current
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Answer:
Option (c) |
6. |
Zero sequence currents can flow from a line into a transformer bank if the windings are in
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Answer:
Option (a) |
7. |
In an unbalanced 3-phase system, the currents are measured as Ia = zero, Ib = 6∠60° and Ic = 6∠–120°. The zero sequence, positive sequence and negative sequence components will be
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Answer:
Option (c) |
8. |
The impedance per phase of 3-phase transmission line on a base of 100 MVA, 100 kV is 2 pu. The value of this impedance on a base of 400 MVA and 400 kV would be
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Answer:
Option (c) |
9. |
If the positive, negative and zero sequence reactances of an element of a power system are 0.3, 0.3 and 0.8 respectively, then the element would be a
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Answer:
Option (d) |
10. |
If a 500 MVA, 11 kV three-phase generator at 50 Hz feeds, through a transfer impedance of (0.0 +j0.605) Ω/phase, an infinite bus also at 11 kV, then the maximum steady state power transfer on the base of 500 MVA and 11 kV is
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Answer:
Option (d) |