Electric Traction Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction? Tap changing control of transformer Reduced current method Series parallel operation of motors All of the listed here Tap changing control of transformer Reduced current method Series parallel operation of motors All of the listed here ANSWER DOWNLOAD EXAMIANS APP
Electric Traction The air resistance to the movement of the train is proportional to (speed)3 (speed)2 speed 1/speed (speed)3 (speed)2 speed 1/speed ANSWER DOWNLOAD EXAMIANS APP
Electric Traction If the coefficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails? 0.16 0.35 0.26 0.46 0.16 0.35 0.26 0.46 ANSWER DOWNLOAD EXAMIANS APP
Electric Traction Coefficient of adhesion is High in case of D.C. traction than in the case of AC. traction All of the listed here Equal in both AC. and D.C. traction Low in case of D.C. traction than in the case of AC. traction High in case of D.C. traction than in the case of AC. traction All of the listed here Equal in both AC. and D.C. traction Low in case of D.C. traction than in the case of AC. traction ANSWER DOWNLOAD EXAMIANS APP
Electric Traction Which of the following is the advantage of electric braking? It is instantaneous More heat is generated during braking It avoids wear of track Motor continues to remain loaded during braking It is instantaneous More heat is generated during braking It avoids wear of track Motor continues to remain loaded during braking ANSWER DOWNLOAD EXAMIANS APP
Electric Traction The overall efficiency of steam locomotive is around 25 to 35 percent 15 to 20 percent 5 to 10 percent 35 to 45 percent 25 to 35 percent 15 to 20 percent 5 to 10 percent 35 to 45 percent ANSWER DOWNLOAD EXAMIANS APP
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