TRANSMISSION AND DISTRIBUTION MODEL QESTION PAPER Fourth Semester Diploma

MODEL QESTION PAPER

 

Fourth Semester Diploma Examination

ELECTRICAL BOARD

        TRANSMISSION AND DISTRIBUTION

TIME: 3 Hours                                                                                               Max Marks: 100  

                         Note:  i) Section I is compulsory.

                                    ii) Answer any six full questions taking two full questions

                                         from each of the remaining sections.

 

 

SECTION -I

1. a)    Fill in the blanks with appropriate word / words :                                             5x1 = 5

i)                    The full form of SCADA is--------------

ii)                  Power loss will be minimum in a transmission line if the load P.F is ------------

iii)                Voltage drop in cable system is ------------ than over head system.

iv)                The location of  lighting arrestor in sub-station is -------------

v)                  For balanced 3 phase 4 wire system ,the load current in the neutral is -----------

             b)   Explain indoor and outdoor type substation.                                                                5

 

SECTION -II

2.      a) Compare overhead system with underground system of transmission line.                    8

         b) A single phase transmission line transmitting 1000 KW power to a factory at 11 KV at  

             0.8  Power factor lag has a loop resistance of 2 Ω and reactance of 3 Ω. Determine 

             sending end voltage and % regulation.                                                                             5                                                    

          c)List any two advantages of AC transmission line.                                                           2

 

3.       a) Draw and explain vector diagram for short transmission line.                                       8

           b) List the merits and demerits of direct laying of UG cable.                                            5

           c) Name the classifications of UG cables.                                                                          2

 

 4.         a) Explain different transmission system.                                                                          8

             b) Explain the meaning of corona.                                                                                     5

             c) List the factors affecting corona.                                                                                   2

SECTION – III

 

5. a) Explain the procedure for erection of  steel towers.                                                               8

    b) Explain the maintenance of overhead transmission line.                                                        5

    c) List the materials used for line supports.                                                                                 2

6.  a) Explain double bus double breaker type bus bar arrangement with a neat diagram              8

     b) Explain the maintenance of station transformer.                                                                   5

     c) State the meaning of receiving station.                                                                                  2

7.  a) Explain the main components of HVDC transmission system.                                             8

    b) List the different types of fact controllers.                                                                             5

    c) List the various units of substation.                                                                                        2

       

SECTION – IV

 

8.  a) Explain feeder, distributor and service main in distribution system.                                     8

     b) Explain voltage drop in feeders.                                                                                             5

     c) State the difference between 3 wire  and 4 wire distribution system.                                    2

9. a) Explain the different methods of protection against lightning.                                               8

    b) Explain horn gap type lighting arrestor.                                                                                 5

    c) Define voltage surge.                                                                                                               2

10. a) Explain the need for distribution automation.                                                                       8

      b) Write a note on SCADA system.                                                                                           5

     c) List the objectives of distribution automation.                                                                       2