Power System-1 BTEE-405 4th Sem B.Tech PTU April 2013 Paper

Download Previous Year PTU University Question  Paper of Power System-1 BTEE-405 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper

B.Tech. (EE-2011 Batch)

POWER SYSTEM-1

Subject Code : BTEE-405          Paper ID : [ A1208]

Time : 3 Hrs.                          Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions

Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper

SECTION-A

Q1. Write Short Notes on :

   a) State disadvantages of HVDC transmission.
   b) Give the advantages of high voltage AC transmission.
   c) Mention limitations of Kelvin’s law.
   d) Enumerate merits of bundled conductor.
   e) Define safety factor of insulator and give its significance.
   f) What is skin effect ? Why is it absent in the dc system?
   g) Define the terms feeder and distributor.
   h) What is the importance of intersheath in cables?
    i) State advantages of placing series capacitors in transmission lines.
    j) What is meant by surge impedance loading?

                                      SECTION-B

Q2. Attempt any FOUR questions.                                                                    5×4=20

    2. Compare the volume of conductor material required in dc single phase and three-phase ac system.
    3. In a 33 kV overhead line, there are three units in the string of insulators. If the capacitance between each insulator pin and earth is 11% of self-capacitance of each insulator, find :
     (a) the distribution of voltage over 3 insulators
     (b) string efficiency.
   4. A single phase transmission line has two parallel conductors 3 m apart, the radius of each conductor being 1 cm. Calculate the loop inductance per km length of the line if the material of the conductor is :
     (a) copper
     (b) steel with relative permeability of 100.
   5. Show how regulation and transmission efficiency are determined for medium lines using nominal T method. Illustrate your answer with suitable vector diagram.
   6. Derive an expression for the insulation resistance of a single-core cable.

                                     SECTION-C

Q3. Attempt any TWO questions.                              2×10=20

  7. (a) What is the percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss?
     (b) Show that in a string of suspension insulators, the disc nearest to the conductor has the highest voltage across it. (6,4)
  8. (a) Describe the Receiving end circle diagram for long transmission lines based on ABCD constants.
      (b) Discuss the effect of earth on capacitance of conductors. (6,4)
   9. Write short notes on any two of the followings :
       (a) Synchronous phase modifiers
       (b) Kelvin’s law
      (c) Compensation of transmission lines. (2×5)

Disadvantages of HVDC transmission.
   

Advantages of high voltage AC transmission.
   

Limitations of Kelvin’s law.
   

Merits of bundled conductor.
   

Safety factor of insulator and give its significance.
   

Skin effect and Why is it absent in the dc system
   

Feeder and distributor.
   

Importance of intersheath in cables.
    

Advantages of placing series capacitors in transmission lines.
    

Power System-1 4th Sem Batch 2011 B.Tech PTU April 2013 Question Paper 

Compare the volume of conductor material required in dc single phase and three-phase ac system.

A 33 kV overhead line, there are three units in the string of insulators. If the capacitance between each insulator pin and earth is 11% of self-capacitance of each insulator, find :
(a) the distribution of voltage over 3 insulators
(b) string efficiency.

Single phase transmission line has two parallel conductors 3 m apart, the radius of each conductor being 1 cm. Calculate the loop inductance per km length of the line if the material of the conductor is :
(a) copper
(b) steel with relative permeability of 100.

Show how regulation and transmission efficiency are determined for medium lines using nominal T method. 

Expression for the insulation resistance of a single-core cable.

Power System-1 4th Sem Batch 2011 B.Tech PTU April 2013 Question Paper 

Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper

Find percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss.

Show that in a string of suspension insulators, the disc nearest to the conductor has the highest voltage across it. 

Explain Receiving end circle diagram for long transmission lines based on ABCD constants.

Effect of earth on capacitance of conductors.  

Write short notes on 
(a) Synchronous phase modifiers

Short Note on (b) Kelvin’s law

 Short Note on (c) Compensation of transmission lines.

Power System-1 4th Sem Batch 2011 B.Tech PTU April 2013 Question Paper 
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