50 MUST KNOWING QUESTIONS WITH ANSWERS ABOUT TRD ......  
                                      Q.1. ‘N’ type of portal covers how many maximum number of tracks ?
A.. 4 nos.
Q.2 How much weight is provided in the 3 pulleys ATD?
A. 665kg.
Q.3. What is the tension provided in regular OHE in each conductor?
A.. 1000 Kg.
Q.4. What is the length of S.S.wire rope of 3 pulleys type ATD ?
A.. 08.50 mts.
Q.5. What should be the spacing of ‘G’ jumper on X/O from obligatory mast ?
A.. 5.6 M.
Q.6. Why Capacitor Bank is used for TR-D system ?
A.. To improve power factor.
Q.7. What is the full form of SCADA ?
A.. Supervisory Control and Data Acquisition System.
Q.8. What is the dimension of TTC upright for 5.5 mt boom?
A.. 300 mm X 225 mm
Q.9. What is the minimum encumbrance at Section insulator ?
A.. 0.40 mts.
Q.10. What is the trailing end swept zone clearance?
A.. 1.72 mts.
Q.11 How many earth rods are required to be provided on OHE before working on it?
A. 2 nos.
Q.12. What is the relative gradient of contact wire on main line ?
A.. 1.5 mm/mt in main line.
Q.13. What should be the spacing of Insulated overlap from starter signal?
A.. 120mts.
Q.14. What is the length of an OHE mast ?
A.. 9.30 m or 9.50 m.
Q.15. What should be the soil pressure for providing pure gravity foundation ?
A. 8250 to 11000 Kg f/m.
Q.1 6. What should be the minimum encumbrance of OHE ?
A.. 15 cms.
Q.17. What is the minimum and maximum voltage of OHE at feeding post?
A. 23.75 & 27.50kv
Q.18. What should be the IR value (minimum) for 25 kv lightning Arrestor?
A.. Infinity.
Q.19. What should be the minimum clearance between P.F. Shed and OHE ?
A. 1.70 M.
Q20. What should be the minimum vertical distance from 25kv line to ground level?
A.. 3 mts.
Q.21. What should be the minimum implantation of obligatory mast at T/Out & X/O ?
A.. 3 mts.
Q.22. What is the full form of BT & TT & ATD?
A. Bracket Tube, Telescopic Tube & Auto Tensioning Device
Q.23. What is the maximum permissible speed of a conventional OHE where section insulator provided in facing direction?
A. 80 KMPH.
Q24. What should be the minimum clearance between contact wire to runner of Section Insulator?
A. 23 cm.
Q.25 What is the full form of CTD provided in a circuit Breaker ?
A Capacitor tripping device
Q.26. In an A.C traction where is 100 KVA A.T. usually provided?
A. Traction sub-station.
Q.27. What is the angle of grove of contact wire ?
A.. 78°.
Q.28. What should be the take off of panto at X/O or T/O ?
A.. 650 mm - 720 mm.
Q.29. What is the operating voltage of Crompton SF6 gas C.B. ?
A.. 110 V D.C.
Q 30. What should be the track separation and where the obligatory structure can be located on a X/O or T/O ?
A. 150 mm – 700 mm.
Q.31 What should be the maximum permissible distance of a Section Insulator from a support on a 49.5 M span?
A.. 15 M.
Q.32. What should be the minimum distance of PTFE N/S after stop signal on level tangent track ?
A. 200 mts.
Q.33. What is the facing and swept zone clearance ?
A. 1.60 mt.
Q.34. What is the minimum clearance between cradle guard of line crossing OHE to catenary wire ?
A.. 2 mt.
Q.35 What is the total tension provided on unregulated OHE ?
A. 3000 Kg.
Q.36 What is the cross sectional area of catenary wire ?
A. 65.40 sq. mm.
Q.37. What is the condemned diameter of contact wire on Loop/Yard line ?
A 8.00 mm.
Q.38. What is the minimum distance between two droppers ?
A. 4.50 mt.
Q.39. What is the minimum permissible height of contact wire ?
A. 4.65 mt.
Q.40. Where and what type of bond is essential to be provided at any level crossing gate ?
A.. Cross bond in either side of L/C gate within 5mts .
Q.41. Why lightning arrestor have been provided in OHE ?
A. To divert surge into ground.
Q.42. How many strands are there on outer layer of catenary wire?
A.. 12 nos.
Q.43. What is the maximum span length of X/O span ?
A.. 54 M.
.Q.44. What is the maximum no. of contact Splices allowed on half tension length of 600 m ?
A. 6 Nos.
Q.45 What is the cross sectional area of ‘G’ jumper ?
A. 105 sq.mm.
Q.46 What are the relays used in a feeder protection ?
A. O.C, W.P.C, D.P. .
Q.47 What is the interval of emergency socket provided along the track ?
A.. 750 mts to 1km .
Q.48 What is the maximum permissible earth resistance of TSS. ?
A. 0.5W.
Q.49 What are the factors for replacement of contact wire ?
A Number of splices and condemned diameter.
Q.50 What happened if one strand of catenary wire has remained inside the groove of cone of splice?
A. catenary wire will slip.