The voltage used for suburban trains in D.C. system is usually_______________?

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_________ locomotive has the highest operational availability?

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Which of the following drives is suitable for mines where explosive gas exists ?

A. Steam engine B. Diesel engine C. Battery locomotive D. Any of the above...

The rate of acceleration on suburban orurban services is restricted by the consideration of______________?

A. Engine power B. Track curves C. Passenger Discomfort D. Track size...

The resistance encountered by a train in motion is on account of_________________?

A. resistance offered by air B. friction at the track C. friction at various parts of the rolling stock D. all of the above...

The braking retardation is usually in the range__________________?

A. 0.15 to 0.30 km phps B. 0.30 to 0.6 km phps C. 0.6 to 2.4 km phps D. 3 to 5 km phps E. 10 to 15 km phps...