EPTD-Questions for EE&EEE from module 1&2 bput 2015-19 batch ) by Satya Sir (prof. Gec) ~ Learning & Discussion

EE&EEE EPTD-Questions from module 1&2 bput 2015-19 batch .

Prepared by:-Satyabrata sahoo sir (prof. GEC)

MCQ SHORT TYPE UPDATED Questions

Probable Question For transmission And Distribution system & EPDT

Sem- 6^th, Branch- EE Sem- 4^th, Branch-EE & EEE

SHORT QUESTIONS

1. Briefly explain two advantages of bundled conductors?

2.What is ACSR and where it is used ?

3. What is GMR and GMD ?

4. Explain briefly the effect of high capacitance on transmission line ?

5. What is string efficiency in the insulator ?

6. What is Ferranti effect ?

7. What is skin effect and Proximity effect?

8. State the advantages of double circuit line over single circuit line ?

9. What is surge impedance in transmission line ?

10. With neat sketch briefly explain strain insulator?

11. What is stay insulator Define regulation of transmission line?

12. ?

13. Draw the nominal π representation of the transmission line ?

14. Why transmission index are transposed?

15. Draw the equivalent circuit and phasor diagram for medium transmission line (T – network)?

16. Shunt capacitors are very widely used in present day distribution system justify this statement briefly ?

17. Draw equivalent circuit and phasor diagram for short transmission line ?

18. What is guard ring and why it is required ?

19. What are the important characteristics that an over head line insulators must provide ?

20. Explain the classification of lines based on their length of transmission ?

21. What type of insulator are used for overhead transmission and distribution lines ?

22. Write down two methods for improving string efficiency ?

23. On what factor does the skin effect depends?

24. What is the range of surge impedance for an overhead transmission line ?

Objective type question

1) For short transmission line ____________effect is neglected .
a) Inductance b) resistance c) capacitance d) none of these

Ans-capacitance

2) __________type of insulators are used up to 33 KV.
a) suspension b) pin c) sackle d) none

Ans:-b

3) Specific resistance of a conductor depends not only on the conductor material but also on its ____________

Ans-temperature

4) In ___________frequencies the skin effect is very small.
a) high b) medium c) low d) none.

Ans_low frequency

5) In comparison to single conductor bundled conductors can carry ___________power.
a) Less b) high c) zero d ) none

Ans--High

6) Charging currents are more predominated in case of which transmission line.
a) Short b) medium c ) long d) none

Ans-long

7) The use of more than one conductor per phase in a transmission line is called ___________ conducter.

Ans:-bundle

8) Transmission lines having length less than ___________km is known as short transmission line .

Ans:--80kms

9) Transmission line having length greater than ___________km is known as long transmission line .

Ans:-250kms

10) Transmission line having length between ________km & __________km is known as medium transmission line .

Ans :-80km ,250km

11) When receiving end voltage is greater than sending end voltage for a long transmission line is called ________

Ans :--feranti effect

12) Power in a transmission line increases when
a) line reactances reduces b) both end voltage increase c) both a & b d) none of these

Ans:-both a &B

13) Load end condenser method is used in _______line.
a ) long transmission b) medium transmission c) short transmission d) none

Ans :-medium

14) Nominal π and T are used for ____________ transmission.
a) Short b) medium c ) long d) none

Ans :-medium

15) The range of surge impedance for an overhead transmission line is
a)300-400 Ω b)400-500 Ω c) 400-600 Ω d) none

Ans:-400-600ohm

PROBABLE LONG QUESTION FOR TDS & EPTD

1. Derive transmission line constant A, B, C &D parameter for short transmission line?

2. Explain in brief, the classification of transmission line?

3. Explain why the voltage distribution over a string of suspension insulator is not uniform and also derive string efficiency?

4. Derive A, B, C&D parameter of a medium transmission line, assuming that entire capacitance is connected at the receiving end?

5. Why suspension insulators are prefer for high voltage power transmission?

6. Explain why the voltage across the string is not equal?

7. Derive A, B, C &D parameters of a medium transmission line of π-Network with phasor diagrams shown in?

8. A 300 Km 3-phase overhead line has a series impedance of 11+j106Ω/ph and a shunt admittance of 1.13*10^-3 <90 degree Siemens/phase.

The line deliver 250MW Of unit power factor and at 275Kv

Find (a) constants A, B, C, D

(b) Sending end voltage

(d) Sending end power

9. The 3 conductors of a 3-phase overhead line are arranged in a horizontal plane with a spacing of 4 meter between adjacent conductors, the diameter of each conductor is 2 cm. Determine the inductance per km per phase of the line assuming that the lines are transposed?

10. Explain why the voltage across the insulator string is not equal and also describe practical method to improve them?

11. Determine the string efficiency of a string insulator of 3 units having self-capacitance equal to 5times the pin to earth capacitance?

12. A conductor is composed of 7 identical cupper strands each having a radius ‘r’ .Find self GMD of the conductor?

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Learning & Discussion

Wednesday, 1 March 2017