MCQs: In a diesel electric traction, if the current in the traction motor increases then the generator field
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MCQs: The area under the speed - time curve represents the
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MCQs: During the train movement, the tractive effort produced at the pinion by the motor is transferred to the driving wheel
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MCQs: If W is the dead weight of the train in tones and A is the acceleration of the train in kmphps then the tractive effort required for linear acceleration is given by
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MCQs: The magnitude for the tractive effort which is required for the propulsion of the train depends on
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MCQs: A low frequency supply is given to the single phase AC system for track electrification because
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MCQs: Pantograph collector is used in railways where the train runs at 100 to 130 kmph. Which among the following is true about pantograph collector?
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MCQs: The lighting system of almost all the earlier coaches and all the newly manufactured coaches has
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MCQs: Seam welding is not used for the
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MCQs: In percussion welding, the heat is produced by a rapid discharge of stored electrical energy from
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MCQs: The electrodes used for projection welding are
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MCQs: Spot welding is used to weld metal pieces whose thickness
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MCQs: The voltage - current characteristics of the arc welding must be
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MCQs: The advantage of rectifier type welding set is
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MCQs: For a good weld,
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MCQs: A rectifier with an external low pass filter is an example of
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MCQs: In ac - dc conversion, when the switch is closed then the sum of voltages around the loop is
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MCQs: An ideal switch is
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MCQs: IGBT stands for
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MCQs: Number of PN junction in an SCR is
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