1 a) With respect to phases name six systems that are available for A.C distribution; (6 marks)
b) (i) Why is electrical power normally transmitted at high voltage? (1 marks)
(ii) A single-phase line has an impedance of 5 °? and supplies a load of 120A, 3,300V
at 0.8 p.f lagging. Draw a vector diagram and use it to calculate the sending-end voltage. (3 marks)
c) An overhead, single phase-phase transmission line delivers 1100Kw at 33kV at 0.8 p.f lagging. The total resistance of the line is 10O and a total inductive reactance is 15 O..Determine;
(i) Transmission efficiency
(ii) Sending-end voltage
(iii) Sending-end p.f. (4 marks)
2 a) with the help of a neat sketch give a brief outline of a typical A.C power supply scheme showing the following parts; ( 7 marks)
(i) Generating station
(ii) Primary transmission
(iii) Secondary transmission
(iv)Primary distribution
(v) Secondary distribution
b) Give any four advantages of high voltage D.C transmission over high voltage A.C transmission. (4marks)
c) Give any three disadvantages of high voltage D.C transmission over high voltage A.C transmission.
(3 marks)
For a custom-written paper on the above topic, place your order now!
What We Offer
• On-time delivery guarantee
• PhD-level professionals
• Automatic plagiarism check
• 100% money-back guarantee
• 100% Privacy and Confidentiality
• High Quality custom-written papers
