21. |
A long overhead transmission line is terminated by its characteristic impedance. Under this operating condition, the ratio of the voltage to the current at different points along the line will
|
||||||||
Answer:
Option (d) |
22. |
For a transmission line with negligible losses, the lagging reactive power (VAR) delivered at the receiving-end, for a given receiving-end voltage is directly proportional to the
|
||||||||
Answer:
Option (d) |
23. |
A three-phase transmission line of negligible resistance and capacitance has an inductive reactance of 100 Ω∕ phase. When the sending-end and receiving-end voltages are maintained at 110 kV, the maximum power that can be transmitted will be
|
||||||||
Answer:
Option (a) |
24. |
The per unit regulation of a short transmission line having a per-unit resistance voltage drop Vr and a per-unit reactance voltage drop of Vx at rated current and power factor cos Θ, is given by
|
||||||||
Answer:
Option (c) |
25. |
A 50 Hz 3-phase transmission line of length 100 km has a capacitance of 0.03/π, μF∕ km. It is represented as a π model. The shunt admittance at each end of the transmission line will be
|
||||||||
Answer:
Option (a) |
26. |
In which one of the following models of transmission lines, is the full charging current assumed to flow over half the length of the line only ?
|
||||||||
Answer:
Option (d) |
27. |
If the receiving-end voltage and current are numerically equal to the corresponding sending-end values, that is, |Vs| = |Vr| and |Is| = |Ir|, then such a line is called
|
||||||||
Answer:
Option (a) |
28. |
The values of A, B, C and D constants for a short transmission line are respectively
|
||||||||
Answer:
Option (c) |
29. |
The ABCD constants of a 3-phase transmission line are A = D = 0.8∠1° ; B = 170∠85° Ω ; C = 0.002∠90.4° ℧. The sending end voltage is 400 kV. The receiving end voltage under no load condition is
|
||||||||
Answer:
Option (b) |
30. |
For a fixed receiving end and sending end voltages in a transmission system, what is the locus of the constant power
|
||||||||
Answer:
Option (a) |