11.1 An arrangement of OHE over a track, where two sets of OHE conductors are run parallel toeach other for a short distance & provide smooth passage for pantograph, is called
(a) Turnout
(b) Crossover
(c) Overlap
(d) Neutral section
Answer - (c) Overlap
11.2 Insulated overlap is required for
(a) OHE sectioning purpose
(b) To kept OHE in current collection zone at curve
(c) To maintain height of OHE conductors
(d) All of the above
Answer - (a) OHE sectioning purpose
(a) 500 mm.
(b) 380 mm.
(c) 300 mm.
(d) 200 mm.
Answer - (a) 500 mm.
11.4 In AC traction, distancebetween two OHE‟s conductor in un-insulated overlap is kept
(a) 375 mm
(b) 300 mm
(c) 150 mm
(d) 200 mm
Answer - (d) 200 mm
11.5 Un-insulated overlap is provided in OHE because
(a) To restrict span length
(b) To restrict tension length
(c) Quick isolation of OHE
(d) All of the above
Answer - (b) To restrict tension length
11.6 In AC traction, how many spans are required to construct an overlap on tangent track
(a) One span
(b) Two span
(c) Three span
(d) Four span
Answer - (c) Three span
11.7 In AC traction, how many spans are required to construct an overlap on curve track
(a) One span
(b) Two span
(c) Three span
(d) Four span
Answer - (d) Four span
11.8 Normally, insulated overlap are employed at the location
(a) SSP
(b) FP
(c) Booster transformer‟s location
(d) All of the above
Answer - (d) All of the above
11.9 In four span insulated overlap, the distance between the centre of the four span insulated overlap & anticreep should not be more than
(a) 800 m
(b) 750 m
(c) 600 m
(d) 450 m
Answer - (c) 600 m
11.10 Why distance between the centre of the four span insulated over lap & anti-creep restrictedupto 600 m ?
(a) To ensure satisfactory clearance between bracket assembly
(b) To maintain uniform tension
(c) Proper gradient of contact wire
(d) Blow-off within limit
Answer - (a) To ensure satisfactory clearance between bracket assembly
11.11 In AC traction, cut-in insulators are provided at insulated overlap, the distance of cut-ininsulator from the mast is
(a) 18 m
(b) 9 m
(c)4.5 m
(d) 2 m
Answer - (d) 2 m
11.12 The normal desirable length of zone, where pantograph contacts both contact wires in overlapwill be
(a) 1 m
(b) 4.5 m
(c) 6 m to 9 m
(d) 18 m
Answer - (c) 6 m to 9 m
11.13 In three span insulated overlap arrangement, centre span or overlap span should not belessthan
(a) 67.5 m
(b) 54 m
(c) 58.5 m
(d) 63 m
Answer - (c) 58.5 m
11.14 In three span un-insulated overlap arrangement, centre span or overlap span should not be lessthan
(a) 67.5 m
(b) 54 m
(c) 58.5 m
(d) 63 m
Answer - (b) 54 m
11.15 A short dead section of OHE, which separates two adjoining elementary section & providesmooth passage for pantograph is called
(a) Insulated overlap
(b) Un-insulated overlap
(c) Neutral section
(d) All of the above
Answer - (c) Neutral section
11.16 Normally, which type of neutral section have been adopted by Indian Railways
(a) Overlap type
(b) PTFE type neutral section
(c) Short neutral section comprising section insulator assembly
(d) All of the above
Answer - (d) All of the above
11.17 Minimum effective neutral section length is required in overlap type neutral 27section
(a) 49.5 m
(b) 54 m
(c) 63 m
(d) 41 m
Answer - (b) 54 m
11.18Which type of neutral section, you prefer in heavily graded or suburban section?
(a) Overlap type
(b) PTFE type neutral section
(c) Short neutral section comprising section insulator assembly
(d) None of the above
Answer - (d) None of the above
11.19 The length of PTFE type neutral section is
(a) 5.163 m
(b) 5.64 m
(c) 5.92 m
(d) 6.21 m
Answer - (a) 5.163 m
11.20 PTFE stands for
(a) Plastic Tetra Floro Ethane
(b) Poly Thermo Finials Ethane
(c) Poly Tetra Floro Ethane
(d) Poly Tetra Floro Ethylene
Answer - (d) Poly Tetra Floro Ethylene
11.21 The effective neutral section length of minimum 41 mhas been designed for overlap typeneutral section ,due to
(a) Three loco(old type) attached each other , front panto of 1st loco & rear panto of 3rd locoare raised. This panto to panto distance less than 41 m.
(b) One loco(old type) attached in train ,front panto & rear panto are raised . This panto topanto distance less than 41 m.
(c) Three loco(old type) attached each other, rear panto of 1st loco & front panto of 3rd loco areraised. This panto to panto distance less then 41 m.
(d) None of the above.
Answer - (a) Three loco(old type) attached each other , front panto of 1st loco & rear panto of 3rd locoare raised. This panto to panto distance less than 41 m.
11.22 The tension length of conventional i.e. overlap type neutral section is restricted to
(a) 600 m
(b) 750 m
(c) 800 m
(d) 1500 m
Answer - (a) 600 m
11.23 How many spans are required to consist an overlap type neutral section
(a) 4
(b) 5
(c) 6
(d) 7
Answer - (b) 5
11.24 Length of central span in overlap type neutral section is restricted upto
(a) 49.5 m
(b) 54.0 m
(c) 63.0 m
(d) 67.5 m
Answer - (a) 49.5 m
11.25 In overlap type of neutral section, the stagger of both OHE‟s are chosen in such a way that theclearance between both OHE‟s in entire central spanshould not be less than
(a) 320 mm
(b) 375 mm
(c) 500 mm
(d) 1000 mm
Answer - (d) 1000 mm
11.26 PTFE type of neutral section provided on(a) mid span
(b) 1/3 of span
(c) 1/10 th of span
(d) Symmetrically on either side of the support
Answer - (d) Symmetrically on either side of the support
11.27 PTFE type of neutral section is suitable upto the speed
(a) 70 KMPH
(b) 100 KMPH
(c) 200 KMPH
(d) 140 KMPH
Answer - (c) 200 KMPH
11.28 Stagger at PTFE type Neutral section assembly is
(a) Zero or maximum 100 mm.
(b) 100 mm or maximum 200 mm
(c) 200 mm or maximum 300 mm
(d) 300 mm or maximum 380 mm
Answer - (a) Zero or maximum 100 mm.
11.29 Adoption of neutral section in section insulator are to be avoided on main running linesbecause
(a) Heavy weight
(b) Speed restriction
(c) Frequent maintenance
(d) All of the above
Answer - (d) All of the above
11.30 In PTFE type neutral section assembly, Anti torsion droppers are used for
(a) Good current collection at higher speed
(b) To prevent oscillation of OHE
(c) Push up of contact wire very gradually
(d) All of the above
Answer - (d) All of the above
11.31 Catenary insulator of PTFE Neutral section comprises
(a) Resin bonded glass fiber
(b) Poly venial chloride
(c) XLPE
(d) Ancholite
Answer - (a) Resin bonded glass fiber
11.32 The caution boards to are provided to attend the driver of train show thedistance of neutral section location what will be the location of both caution boards from theNeutral section
(a) 100 m.& 500 m
(b) 2000 m. & 1000 m
(c)500 m. & 250 m
(d) 250 m. & 150 m
Answer - (c)500 m. & 250 m
11.33 Which factor should be taken into account to locate neutral section
(a) Signal location
(b) Gradient of section
(c) Level Crossing gate
(d) All of above
Answer - (d) All of above
11.34 On tangent track before neutral section, signal locationshould not be less than
(a) 600 m.
(b) 500 m.
(c) 400 m.
(d) 300 m.
Answer - (c) 400 m.
11.35 On tangent track after neutral section, signal location should not be less than
(a) 600 m
(b) 400 m
(c) 300 m
(d) 200 m
Answer - (d) 200 m
11.36 1 in 300 gradient track before neutral section, signal location should not be less than
(a) 1600 m
(b) 300 m
(c) 600 m
(d) 400 m
Answer - (a) 1600 m
11.37 1in 300 gradient track, after neutral section, signal location should not be less than
(a) 1600 m
(b) 800 m
(c) 600 m
(d) 400 m
Answer - (b) 800 m
11.38 1 in 200 gradient track before neutral section, signal location should not be less than
(a) 2700 m
(b) 2500 m
(c) 2100 m
(d) 1600 m
Answer - (b) 2500 m
11.39 1 in 200 gradient track after neutral section, signal location should not be less than
(a) 2500 m
(b) 1600 m
(c) 1800 m
(d) 1250 m
Answer - (a) 2500 m
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