### MCQs of Basic Principles

Showing 11 to 20 out of 135 Questions
11.
A transmission line of 80 km length is operating at 400 Hz, it can be classified as
 (a) Short length line (b) Medium length line (c) Long length line (d) All of the above
12.
A transmission line of 210 km length has certain values of parameters A, B, C, D. If the length is made 100 km thus the parameter
 (a) A increase B decreases (b) A decreases B also decreases (c) A and B both increase (d) A decreases B increases
13.
A transmission line of 210 km length has certain values of parameters A, B, C, D. If the length is made 100 km thus the parameter
 (a) C increases D decreases (b) C and D both decrease (c) C and D both increase (d) C decreases D increases
14.
The main consideration for higher and higher operating voltage of transmission is to
 (a) Increase efficiency of transmission (b) Reduce power losses (c) Increase power transfer capability (d) (a) and (b)
15.
A 100 km transmission line is designed for a nominal voltage of 132 kV and consists of one conductor per phase. The line reactance is 0.726 Ω/km. The static transmission capacity of the line, in Megawatts, would be
 (a) 132 (b) 240 (c) 416 (d) 720
16.
If the effect of earth is taken into account, then the capacitance of line to ground
 (a) Decreases (b) Increases (c) Remains unaltered (d) Becomes infinite
17.
A single-phase transmission line of impedance j 0.8 Ω supplies a resistive load of 500 A at 300 V. The sending-end power factor is
 (a) Unity (b) 0.8 lagging (c) 0.8 leading (d) 0.6 lagging
18.
For a transmission line with resistance (R), reactance (X) and negligible capacitance, the line constant A is
 (a) 0 (b) 1 (c) R + jX (d) R + X
19.
A short transmission line, having its line-impedance angle as Θ, is delivering a given power at the receiving-end at a lagging power-factor angle of Φ. Which one of the following is a set of conditions for which this line will have maximum and zero regulation ?
 (a) Φ = Θ and Φ – Θ = π∕2 (b) Φ – Θ = π∕2 and Φ = Θ (c) Φ = Θ and Φ + Θ = π∕2 (d) Φ+ Θ = π∕2 and Φ= Θ
20.
If, in a short transmission line, resistance and inductive reactance are found to be equal and regulation appears to be zero, then the load will
 (a) Have unity power factor (b) Have zero power factor (c) Be 0.707 leading (d) Be 0.707 lagging
Showing 11 to 20 out of 135 Questions