5.1 Axial distance between catenary & contact wire at the OHE support, in vertical plane is called
(a) Implantation
(b) Gradient of OHE
(c) Encumbrance
(d) Stagger
Answer - (c) Encumbrance
5.2 In AC traction, normal encumbrance at support is
(a ) 1.9 m
(b) 1.4 m
(c ) 0 .9 m
(d) 2.0 m
Answer - (b) 1.4 m
5.3 Normal encumbrance in dc is more than ac traction, why?
(a) Heavy weight of dc catenary
(b) Heavy current in dc
(c) More stagger in dc
(d) Less height of dc catenary
5.4 In AC traction, the axial distance between catenary & contact wire in vertical plane at mid spanshould not be less then
(a)150 mm
(b)170 mm
(c) 180 mm
(d)270 mm
Answer - (a)150 mm
5.5 At obligatory structure of turnout, It is general practice to give encumbrance
(a) 1.4 m. turnout OHE & 0.9 m main line OHE
(b) 0.9 m. turnout OHE & 1.4 m main line OHE
(c) 1.4 m. turnout OHE & 1.4 m main line OHE
(d) 0.9 m. turnout OHE & 0.9 m main line OHE
Answer - (a) 1.4 m. turnout OHE & 0.9 m main line OHE
125.6 At turnout structure, It is general practice to give encumbrance of 1.4 m to the turnout OHE &0.9 m to the main line OHE due to
(a) To maintain proper tension.
(b) To accommodated section insulator in turnout OHE
(c) To maintain proper stagger.
(d) None of the above.
Answer - (b) To accommodated section insulator in turnout OHE
5.7 Maximum permissible relative gradient of contact wire in two adjacent span shall not begreater than on main lines
(a) 1.5 mm /m.
(b) 2 mm /m.
(c) 3 mm /m.
(d) 4 mm /m.
Answer - (a) 1.5 mm /m.
5.8 Maximum permissible relative gradient of contact wire in two adjacent span shall not begreater than on sidings
(a) 2 mm /m.
(b) 3 mm /m.
(c) 4 mm /m.
(d) 5 mm /m.
Answer - (d) 5 mm /m.
5.9 Change of the height of the contact wire to be achieved very gradually, to avoid
(a) Loose contact between contact wire & panto graph.
(b) Exert excessive pressure on the contact wire by panto graph.
(c) Poor current collection.
(d) All of the above.
Answer - (d) All of the above.
5.10 What do you mean by “Relative gradient of contact wire”
(a) Change in the height of contact wire first time & last time
(b) Change in the height of contact wire at beginning of tension length
(c) Change in the height of contact wire in the middle of desired height
(d) All of the above
Answer - (a) Change in the height of contact wire first time & last time
5.11 Change in contact wire height with respect to per unit meter length of contact wire is called
(a) Gradient of contact wire
(b) Either Gradient of contact wire or track
(c) Gradient of track
(c) Neither gradient of contact wire nor track
Answer - (a) Gradient of contact wire
5.12 When level crossing gate is approached , the height of contact wire is
(a) Reduce
(b) Increase
(c) Either Reduce or Increase
(d) Neither Reduce or Increase
Answer - (b) Increase
5.13 Maximum permissible gradient of contact wire, when maximum permissible train speed ismore than 100 kmph on main lines
(a) 2 mm/m
(b) 3 mm/m
(c) 4 mm/m
(d) 5 mm/m
Answer - (b) 3 mm/m
5.14 Maximum permissible gradient of contact wire, when maximum permissible train speed isshunting speed in yards
(a) 3 mm/m
(b) 4 mm/m
(c) 5mm/m
(d) 10 mm/m
Answer - (d) 10 mm/m
5.15 What do you mean by the term „hard spot‟ in the contact wire ?
(a) Different material used at different material
(b) Processing in which contact wires joined together
(c) Where contact wire wear is more
(d) All of the above
Answer - (c) Where contact wire wear is more
135.16 In order to reduce the wear of the contact wire, which measures should be adopted ?
(a) Track condition should be good & hard spots on contact wire should be minimum.
(b) Stagger , droppers & contact height should be maintained as per SED
(c) Proper tension in the contact wire & pre-stress tension should be executed on the catenarywire and contact wire at the time of erection.
(d) All of the above
Answer - (d) All of the above
5.17 In AC traction, what will be encumbrance tolerance atsupport is ( As per RDSO latter no.TI/OHE/GA/3013 dated 14.05.13
(a) ± 50 mm
(b) ) ± 20 mm
(c) ± 0 mm
(d) ) ± 10 mm
Answer - (a) ± 50 mm
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