Question Bank For All Commercial Departmental Exam

04-07-2022

Question Bank - Commercial Departmental Exam    CLICK ABOVE OR SEE BELOW PDF   INDIAN RAILWAY QUESTION

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What happens if the wrong selection has been made at the wrong time?
June 22, 2019

Not all IR locos have protection against incorrect line supplies, and the loco can be severely damaged in such cases. In some cases, this will blow a fusible link located near pantograph, and the driver will have to raise the appropriate ALT pantograph to continue. No further damage is possible because the only equipment that is live when

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How are DC locos swapped for AC locos at the point where traction power changes from DC to AC?
June 22, 2019

Today while the the Mumbai area is still mostly at 1.5kV DC, there are a couple of important AC-DC transition points such as Igatpuri -- now Kasara -- and Virar. In time, when 25kV AC becomes the norm and DC traction is decommissioned, these transitions will be history and there will be no more traction changeovers! Sad for railfans, but perhaps

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Why is the neutral section provided with a dummy (neutral or electrically dead) cable? Why can’t it be a real gap?
June 22, 2019

Pantographs of electric locomotives have a spring mechanism or compressed-air assembly that keeps the pantograph pushing up against the contact wire with a certain specific pressure. If the neutral section were not wired and the contact wire simply ceased to exist, then then possibility exists that if the driver has not dropped the pantographs at

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How are phase breaks (AC) or power gaps (DC) handled by the locomotives?
June 22, 2019

The catenary has breaks or gaps in its electrical continuity every once in a while at points where successive sections are connected to different substations. A neutral section of catenary is usually provided between the two live sections of different phases or connected to different substations. At such points, single locomotives do not drop

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How do the new 3-phase AC locos (WAP-5, etc.) work, and how do they compare with the earlier locos?
June 22, 2019

Three-phase AC locos such as WAP-5 use some fairly new technology as compared to the earlier generations of diesel-electrics and electrics. In most of the earlier locos, the traction motors driving the axles are DC motors. DC motors were used because they afforded (in those days) far superior speed and torque control compared to AC motors — the

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What’s the history of electric traction in India?
June 22, 2019

The first electric train ran between Bombay's Victoria Terminus and Kurla along the Harbour Line of CR, on February 3, 1925, a distance of 9.5 miles. In 1926, Thana and Mahim were connected. In 1927, electrification was complete up to Kalyan. In 1928, Borivili in the north was connected (Colaba-Borivili of WR being inaugurated on May 1). In 1929,

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