2.1 A neutral section is provided in OHE between two 25 kV, single phase , 50 Htz. traction substations due to
(a) To separate the zones, which fed by the adjacent substation of different phase
(b) To increases the current carrying capacity of the OHE
(c) To minimize the voltage drop in OHE conductors
(d) All of the above
Answer - (a) To separate the zones, which fed by the adjacent substation of different phase
2.2 Normally, power generation & transmission system of the supply authorities are of
(a) Single phase
(b) Two phase
(c) Three phase
(d) Three phase & neutral wire
Answer - (c) Three phase
2.3 25 kV traction system needs the supply of
(a) Single phase
(b) Two phase
(c) Three phase
(d) Three phase & neutralwire
2.4 Normally, power generation & transmission system of the supply authorities are of three phasetype & incoming supply is taken in consecutive 25 kV ac traction sub stations is of differentphase in rotation , due to
(a) Balance the traction load on each phase
(b) Unbalance the traction load on each phase
(c) Obtained maximum power
(d) Minimise voltage drop
Answer - (a) Balance the traction load on each phase
2.5 Normally, two adjacent 25 kV AC traction sub stations works as in
(a) Parallel
(b) Series
(c) Independent
(d) Cannot say
Answer - (c) Independent
2.6 In Indian Railways, what will be the maximum permissible % of unbalance voltageInstantaneously ?
(a) 20%
(b) 15%
(c) 10%
(d) 5%
Answer - (d) 5%
2.7 In Indian Railways, what will be the maximum permissible % of unbalance voltage for 2minutes ?
(a) 1%
(b) 2%
(c) 3%
(d) 5%
Answer - (c) 3%
2.8 In Indian Railways , what will be the maximum permissible % of unbalance voltage Continuously ?
(a) 1%
(b) 2%
(c) 3%
(d) 5%
Answer - (b) 2%
2.9 The distance of OHE section between FP & SSP or SSP & SSP or SSP & SP is called.
(a) Feeding length
(b) Feeding zone
(c) Sector
(d) Sub sector
Answer - (d) Sub sector
2.10 The distance of OHE section between FP & SP is called
(a) Feeding length
(b) Feeding zone
(c) Sector
(d) Sub sector
Answer - (c) Sector
2.11 The distance of OHE section, for which “a traction transformer will feed power in emergentcondition” is called
(a) Feeding length
(b) Feeding zone
(c) Sector
(d) Sub sector
Answer - (a) Feeding length
2.12 The distance of OHE section, for which “a traction transformer will feed power in normalcondition” is called
(a) Feeding length
(b) Feeding zone
(c) Sector
(d) Sub sector
Answer - (b) Feeding zone
2.13 The shortest sectionof OHE, which can be isolated through remote control by TPC is called.
(a) Elementary section
(b) Feeding zone
(c) Sector
(d) Sub sector
Answer - (d) Sub sector
2.14 The shortest section of OHE, which can be isolated manually is called
(a) Elementary section
(b) Feeding zone
(c)Sector
(d) Sub sector
Answer - (a) Elementary section
2.15 Interrupters or circuit breakers (CB‟s) can be operated through
(a) Remote control
(b) Local control by TSS operator
(c) Manually
(d) All of the above
Answer - (d) All of the above
2.16 Isolators can be operated through
(a) Remote control
(b) Local control by TSS operator
(c) Manually
(d) All of the above
Answer - (c) Manually
2.17 Interrupter is a
(a) Non automatic type circuit breakers
(b) Automatic type circuit breakers
(c) Both „a‟ and „b‟
(d) Neither „a‟ nor „b‟
Answer - (a) Non automatic type circuit breakers
2.18 Normally, bridging interrupters at SP are in
(a) Close position
(b) Open position
(c) When traction load increased than closed bridging interrupter
(d) When traction load decreased than closed bridging interrupter
Answer - (b) Open position
2.19 Normally, insulated overlap is employed opposite FP. What precautions should be taken , whenadjacent TSS supply is extended upto FP by closing bridging interrupter at SP ?
(a) Handed over a caution order to driver for lower the panto before approaching insulatedoverlap at FP
(b) Both side of FP, power supply should be switched -off
(c) Both feeder CB should be in open position
(d) All of the above
Answer - (a) Handed over a caution order to driver for lower the panto before approaching insulatedoverlap at FP
2.20 What is the main advantage of CB over interrupter
(a) Isolate by remote control
(b) Less maintenance
(c) Automatic trip the circuit when fault occurred
(d) All of the above
Answer - (c) Automatic trip the circuit when fault occurred
2.21 What will be the OHE impedance for single track without return conductor ?
(a) 0.41/ 700 ohm/km
(b) 0.43/ 700 ohm/km
(c) 0.48/ 700 ohm/km
(d) 0.24/ 700 ohm/km
Answer - (a) 0.41/ 700 ohm/km
2.22 What will be the OHE impedance for double track without return conductor ?
(a) 0.41/ 700 ohm/km
(b) 0.43/ 700 ohm/km
(c) 0.48/ 700 ohm/km
(d) 0.24/ 700 ohm/km
Answer - (d) 0.24/ 700 ohm/km
2.23 What will be the OHE impedance for single track with return conductor ?
(a) 0.41 / 700 ohm/km
(b) 0.63 / 700 ohm/km
(c) 0.70 / 700 ohm/km
(d) 0.43 / 700 ohm/km
Answer - (c) 0.70 / 700 ohm/km
2.24 What will be the OHE impedance for double track with return conductor ?
(a) 0.41 / 700 ohm/km
(b) 0.63 / 700 ohm/km
(c) 0.70 / 700 ohm/km
(d) 0.43 / 700 ohm/km
Answer - (d) 0.43 / 700 ohm/km
2.25 What will be the booster transformer impedance ?
(a) 0.10 ohm
(b) 0.15 ohm
(c) 0.24 ohm
(d) 0.43 ohm
Answer - (b) 0.15 ohm
2.26 What will be the booster transformer windings ratio between primary & secondary ?
(a) 1000:5
(b) 1000:3
(c) 1:1
(d) 5:1
Answer - (c) 1:1
2.27 Contact wire is connected with primary of booster transformer in
(a) series
(b) parallel
(c) both series & parallel
(d) Cannot say
Answer - (b) parallel
2.28 The distance betweentwo consecutive booster transformer location in 25 kV AC tractionsystem with return conductor is
(a) 1 km
(b) 1.33 km
(c) 2 km
(d) 2.66 km
Answer - (d) 2.66 km
2.29 In 25 kV AC TSS, the 25 kV transformer CB‟s are given standard number in a manner of
(a) 100, 101, 102, ------etc.
(b) 100, 102, 104,----------etc.
(c) 101, 103, 105, -------etc.
(d) 10, 11, 12, 13, ---------etc.
Answer - (b) 100, 102, 104,----------etc.
2.30 The no. plate of OHE structures for UP line will be such as
(a) 75/12, 75/13, 75/14, ------etc.
(b) 75/12A, 75/13A, 75/14A, ------etc.
(c) 75/13, 75/15, 75/17, ------etc..
(d) 75/13A, 75/15A, 75/17A, ------etc..
Answer - (c) 75/13, 75/15, 75/17, ------etc..
2.31 The no. plate of OHE structures for DN line will be such as
(a) 75/12, 75/13, 75/14, ------etc.
(b) 75/12, 75/14, 75/16, ------etc.
(c) 75/13, 75/15, 75/17, ------etc..
(d) 75/13A, 75/15A, 75/17A, ------etc..
Answer - (b) 75/12, 75/14, 75/16, ------etc.
2.32 For 70/3 no. plate, numerator shows the km distance from starting station , while denominator 8shows the
(a) serial no. of mast of 70 km. post of Up line
(b) serial no. of mast of 70 km. post of DN line
(c) decimal km. distance of mast of 70 km. post of Up line
(d) decimal km. distance of mast of 70 km. post of DN line
Answer - (a) serial no. of mast of 70 km. post of Up line
2.33 For 70/14 no. plate, numerator shows the km distance from starting station, while denominator shows the
(a) serial no. of mast of 70 km. post of Up line
(b) serial no. of mast of 70 km. post of DN line
(c) decimal km. distance of mast of 70 km. post of Up line
(a) decimal km. distance of mast of 70 km. post of DN line
Answer - (b) serial no. of mast of 70 km. post of DN line
2.34 The number plate of OHE structures for loops & sidings line will be such as
(a) 75/101, 75/102, 75/103, ------etc.
(b) 75/100, 75/102, 75/104, ------etc.
(c) 75/101, 75/103, 75/105, ------etc.
(d) 75/1001, 75/1003, 75/1005, ----etc
Answer - (d) 75/1001, 75/1003, 75/1005, ----etc
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