Electric Traction Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction? Series parallel operation of motors Tap changing control of transformer All of the listed here Reduced current method Series parallel operation of motors Tap changing control of transformer All of the listed here Reduced current method ANSWER DOWNLOAD EXAMIANS APP
Electric Traction The efficiency of diesel locomotives is nearly 60 to 70 percent 20 to 25 percent 45 to 55 percent 30 to 40 percent 60 to 70 percent 20 to 25 percent 45 to 55 percent 30 to 40 percent ANSWER DOWNLOAD EXAMIANS APP
Electric Traction The coasting retardation is around 2.6 km phps 3.6 km phps 0.16 km phps 1.6 km phps 2.6 km phps 3.6 km phps 0.16 km phps 1.6 km phps ANSWER DOWNLOAD EXAMIANS APP
Electric Traction Tractive effort is required to Overcome the gravity component of train mass Overcome friction, windage and curve resistance Accelerate the train mass All of the listed here Overcome the gravity component of train mass Overcome friction, windage and curve resistance Accelerate the train mass All of the listed here ANSWER DOWNLOAD EXAMIANS APP
Electric Traction For three-phase induction motors which of the following is the least efficient method of speed control? Rheostat control Pole changing Combination of cascade and pole changing Cascade control Rheostat control Pole changing Combination of cascade and pole changing Cascade control ANSWER DOWNLOAD EXAMIANS APP
Electric Traction Locomotive having mono-motor bogies Are suited both for passenger as well as freight service All of the listed here Has better riding qualities due to the reduction of lateral forces Has better coefficient of adhesion Are suited both for passenger as well as freight service All of the listed here Has better riding qualities due to the reduction of lateral forces Has better coefficient of adhesion ANSWER DOWNLOAD EXAMIANS APP
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