Q114. What care is taken to rectify the light out side the cell without spreading the contamination?

A.      The lights are to be covered with polythene sheet and on the floor also polythene sheet should be kept.

Q115. What care is taken in the disposal of the highly contaminated lamps?

A.     For disposal of the lamps they should be packed and sealed in polythene bag. The tag should be provided.

Q116. What special care is to be taken while providing power supply inside the cell?

A.      Proper earthing should be provided while giving power supply inside the cell. Extension board should be covered with polythene sheet.

Q117. What is the order of priority in cooling system in operation?

A.        PPCW is having priority of operation than Secondary PCW.

Q118.   How does the failure of, secondary process cooling water system affects the whole process?

A.      Failure of secondary process cooling water system affects Khosla air compressor’s cooling, this affects whole process.

Q119. How many systems are inter-connected and what are the safety interlocks?

A.       PPCW is cooled by SPCW and SPCW is cooling Khosla compressor also. This SPCW pump water is cooled in cooling tower.

Q120. What is the starting sequence of cooling water system?

A.        First SPCW pump is started. Then Khosla comp. and then PPCW.

Q121.  In case power failure how the transfer of waste liquid take place?

A.        Diesel pump is provided to transfer the waste liquid in case of power failure.

Q122.  What type of wiring is preferable for MUA motors?

A.        Conduit wiring and acid proof cables are preferable in MUA.

Q123. How the power wiring is carried out in such area where acid/organic spillage is likely?

A.      All motors cables are laid to cable cradle which is above the motors. The prevents the spillage of acid on cables.

Q124.  How the motors are installed in MUA and what is the procedure for removing the motors?

A.      Motors in MUA are installed on steel platform. So even though earth is disconnected due to acid spillage, motor body gets earthing. After availing proper outage, motor foundation screw will be removed. For safety, nearby motors will be stopped and control room will be informed ‘not to operated these motors. Decoupling of motor is necessary prior to remove.

Q125.  What care and precautions are to be observed while working in such areas where

            inflammable/hazardous fumes are encountered?

A.         Following cares should be taken:-

            a. Do not work alone in such areas.

            b. Use comfo/gas mask as per requirement.

            c. If exhaust fan is there, ensure it is ON.

            d. Open flame should not be carried to such areas.

            e. Portable equipments causing spark should not use in such areas.

            f. Equipments used in such areas should be flame proof, fire proof.

Q126. What is the function of OCB?

A.       OCB is meant for making, breaking and carrying normal current and faulty current & to trip the ckt. In case of fault.

Q127  .What are the equipments being operated at 1. Unity PF, 2. Leading PF,  3. Lagging PF.

A.         1.   Unity PF: Incandescent lamps, resistance furnace.

             2. Leading PF: Capacitor banks.

             3. Lagging PF: Arc lamps, induction motors, induction furnace.

Q128.  What are the procedures followed during maintenance of switch yard?

A.      Generally yard maintenance is done on the day when MSEB taking shut down on both the feeders which avoids one more interruption for switch yard maintenance. Line clear permit is taken from MSEB. After this, GODs of both the feeders are opened and tags are provided. Earthing switches are closed in FRP yard. Then maintenance of yard is carried out which including insulator cleaning, lubricating mechanism, applying petroleum jelly to isolator contacts, tightening connections, collecting oil samples of transformers, regeneration of silica gel of transformers etc.

Q129. What are the procedures followed to change over power system during the power interruption in one

           feeder?

A.      If there is a interruption on feeder No. 4, control room, WIP substation and different authorities are intimated for interruption. Taking clearance from control room, emergency load will be shifted to DG, after this OCB is switched off.  Outgoing GOD of OCB is opened and HT bus-coupler is closed. Then again load from DG is shifted to MP – 15 after clearance from Control room.

Q130. What is the class of power supply generated from DG set?

A.       It is class III supply.

Q131. What are the main objects for providing AMF panel?

A.       AMF panel is controlling operation of DG I,II receiving power from DG 1, II, III and MP-15. AMF panel feeds the supply to various emergency loads.

Q132. What are the loads feed by DG sets?

A.       E2 fans, Off gas fans, power plugs in HB & LB, glow box vacuum blowers, WOG 1 & 2, I/F pumps, lift, telephone exchange, NMSF lights, Parkinson air compressor, Emergency station battery charger, criticality monitor, hand checking monitors, stack lights, control transformers in control room, WTA lights.

Q133. What are the loads feed by the DG set when only one DG set is in operation?

A.       Following loads are cut when one DG is in operation:-

           Control transformer in control room, all power plugs in HB, glow box vacuum blower, HP

           annunciation alarm in control room, WTA I & II.

Q134. What are objects for installing station battery?

A.     Station battery is the last and reliable power source used for exit lights and as control supply for tripping system. It is class I supply.