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POWER SYSTEM || NPTEL || WEEK 3 ASSIGNMENT

 1.) The refraction coefficient of voltage and current at the load end of a short circuited line is,

       a. Vg=0; Ig=2

       b. Vg=1; Ig=1

       c. Vg=1; Ig=1

       d. Vg=2; Ig=0

Answer: a.


2.) Which of the following phenomenon occurs upon the termination of a transmission line in an

impedance smaller than its characteristics impedance?

       a. Both of the reflected voltage and current waves are positive.

       b. Both of the reflected voltage and current waves are negative.

       c. The reflected voltage wave is negative and the reflected current wave is positive.

       d. The reflected voltage wave is positive and the reflected current wave is negative.

Answer: c.


3.) A long transmission line has the line inductance of 0.425 mH km. Assume the receiving end of

this line is open and the distance travelled by a 110 KV surge voltage wave in 10us is 1.5 km.

determine the surge power (in MW) in the line

       a. 62-65

       b. 186-190

       c. 575-585

       d. 1723-1726

Answer: b.


4.) A transmission line, having surge impedance of 100 ohm is terminated by an impedance of 155 ohm. If the magnitudes of forward travelling voltage and current are 4.8kV and 30.7A respectively, determine the voltage at the end of the line.

       a. 3.8 kV

       b. 4.8 kV

       c. 5.8 kV

       d. None of the above

Answer: c.


5.) A transmission line, having surge impedance of 100 ohm, is terminated by an impedance of 155 ohm. If the magnitudes of forward travelling voltage and current are 4.8KV and 30.7A respectively, determine the current in amperes flowing through the resistor in amps.

       a. 10-11

       b. 20-21

       c. 22-23

       d. 37-38

Answer: d.


6.) An overhead line with a surge impedance of 275 ohm is connected to a transformer by a short length of cable of surge impedance of 102 ohm. If a rectangular surge wave of 115 kV travels along the line towards the cable. then the voltage of the wave travelling from the junction of the overhead line through the cable towards the transformer would be

       a. -52.77

       b. 52.77

       c. 62.23

       d -62.23

Answer: c.


7.) An overhead line with a surge impedance of 275 is connected to a transformer by a short Length of cable of surge impedance of 102 ohm. If a rectangular surge wave of 115 kV travels along the line towards the junction with the cable, what voltage is reflected back into the line (in kV)?

       a. -5277

       b. 52.77

       c. 62.23

       d. -62.23

Answer: a.

8.) For a given voltage level, surge power in overhead lines

       a. Smaller than in cables due to smaller surge impedance in overhead lines.

       b. Smaller than in cables due to greater surge impedance in overhead lines.

       c. Greater than in cables due to smaller surge impedance in overhead lines.

       d. Greater than in cables due to greater surge impedance in overhead lines.

Answer: b.

9.) In air, a lossless transmission line of length 40 cm with L = 25uH/m. C = 75pF/m is operated at 50MHz. Its electrical path length 

       a. 0.2-0.5mtr

       b. 1.2-1.5mtr

       c. 5.2-5.5mtr

       d. None of the above

Answer: d.

10.) An overhead line is connected to a terminal apparatus through a length of single phase cable, the characteristic impedances being 360 ohm and 120 ohm respectively. A travelling wave of 165 kV magnitude originates in the overhead line and travels towards the junction with the cable. Determine the energy transmitted into the cable during a period of 5.5 us after the arrival of the wave at the junction. 

       a. 103-1057

       b. 3 11-3137

       c. 415-4187

       d. 623-6251

Answer: b.





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