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Power Supply for Electric Traction Interview Questions and Answers: 1. What is the arrangement of power supply on Kanpur-Tundla section ? Ans. 132 kV supply is taken at one point from the supply authorities and then it is distributed by the railway authorities. 2. Name the current collection systems employed for electric locomotives, tramways or …

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Braking and Mechanical Considerations Interview Questions and Answers: 1. Why ordinary mechanical braking cannot be totally replaced by electrical braking ? Ans. Because electric braking cannot hold the vehicle stationary. 2. On what factors does the amount of energy returned to the line depend ? Ans. The amount of energy returned to the line depends …

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Control of Traction Motors Interview Questions and Answers: 1. The resistors employed for control of traction motors are designed for short-time rating. Why ? Ans. Because control resistors are required only during starting of traction motors. 2. Under what conditions is field weakening adopted for controlling the speed of a dc series traction motor ? …

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Electric Traction Motors Interview Questions and Answers: 1. Why the magnetic circuit of a traction motor is not made of cast iron ? Ans. Because cast iron cannot withstand continuous vibrations but traction motors operate in extremely severe service conditions. 2. Why the traction motor must be small in overall dimensions specially in its overall …

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Train Movement and Energy Consumption Interview Questions and Answers: 1. What is meant by speed-time curve ? Ans. The curve drawn between speed and time taking speed on the Y-axis and time on the X-axis is known as speed-time curve. 2. Define terms ‘coasting’ and ‘braking’. Ans. Coasting. At the end of free running period …

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Traction Systems Interview Questions and Answers: 1. Why steam engine drive is not suitable for urban and suburban services where distance between stations is small ? Ans. Because of low coefficient of adhesion it is not possible to have acceleration and retardation with steam engine drive as high as with electric drive. Steam engine drive …

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Refrigeration and Air Conditioning Interview Questions and Answers: 1. What is practical unit of refrigeration ? Define it. Ans. Tonne of refrigeration (TR) is the practical unit of refrig­eration and is defined as the amount of refrigeration effect produced by the uniform melting of one tonne (1,000 kg) of ice from and at 0°C in …

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Electrolytic Processes Interview Questions and Answers: 1. What is electrolysis ? Ans. The breaking of a substance (known as electrolyte) into ions by flow of electric current through it is known as electrolysis. 2. What happens when an electric current is passed through solution of copper sulphate ? Ans. When an electric current is passed …

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