Sathyabama University Question Papers BE Transmission And Distribution Fifth Sem

Sathyabama University Question Papers

BE Transmission And Distribution Fifth Sem

1. What are the limitations of increasing the transmission voltage
level to very high value?
2. What are the limitations of Kelvin’s law?
3. List the advantages of bundled conductors.
4. What do you mean by self G.M.D?
5. What is the effect of load power factor on regulation and
efficiency of a transmission line?
6. What is tuned power line?
7. What are the advantages of underground cable when compared to
over head transmission system?
8. Define string efficiency.
9. What is the role of arcing ground?
10. Write the function of lightning arresters.
PART – B (5 x 12 = 60)
Answer All the Questions

11. (a) Draw and explain the line diagram of a typical transmission
and distribution scheme. Indicate clearly the voltage levels used
at different stages.
(b) Compare A.C systems and D.C. systems used in transmission
and distribution.
12. Briefly explain with help of neat diagram of the following
13. (a) Derive the expression for inductance of a single phase two
wire line.
(b) Calculate the loop inductance per km of a single phase
transmission line consisting of two parallel conductors 1.5m apart
and 1.5 cm in diameter. Calculate also the reactance of the
transmission line if it is operating at a frequency of 50 Hz.
14. (a) Derive the expression for capacitance of a single phase line.
(b) A single phase transmission line has two parallel conductors
5m apart, radius of each conductor being 1.5cm. Calculate the
capacitance of the line per km. Given that e0 = 8.854 x 10-12 F/m.
15. A 3 phase line delivers 3000 Kw at a p.f of 0.8 lagging to a load.
If the sending end voltage is 33 kV, determine
(a) Receiving end voltage
(b) Line current
(c) Transmission efficiency.
The resistance and reactance of each conductor is 5 ohm and 8
ohm respectively.
16. Explain the procedure to draw the receiving end and sending end
power angle diagram.

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