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

• 1. 12 V
• 2. 24 V
• 3. 220 V
• 4. 600 to 750 V

Question: _______________method can bring the locomotive to dead stop?

• 1. Plugging braking
• 2. Rheostatic braking
• 3. Regenerative braking
• 4. None of the above

Question: Vacuum is created by which of the following ?

• 1. Vacuum pump
• 2. Ejector
• 3. Any of the above
• 4. None of the above

Question: Battery operated trucks are used in________________?

• 1. steel mills
• 2. power stations
• 3. narrow gauge traction
• 4. factories for material transportation

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

• 1. resistance offered by air
• 2. friction at the track
• 3. friction at various parts of the rolling stock
• 4. all of the above

Question: Series motor is not suited for traction duty due to which of the following account ?

• 1. Less current drain on the heavy load torque
• 2. Current surges after temporary switching off supply
• 3. Self relieving property
• 4. Commutating property at heavy load

Question: The return circuit for tramcars is through_______________?

• 1. neutral wire
• 2. rails
• 3. cables
• 4. common earthing

Question: In case of _________________ free running and coasting periods are generally long ?

• 1. main-line service
• 2. urban service
• 3. sub-urban service
• 4. all of the above

Question: have maximum unbalanced forces_______________?

• 1. Diesel shunters
• 2. Steam locomotives
• 3. Electric locomotives
• 4. Diesel locomotives

Question: When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when_______________?

• 1. wheel base of axles is more
• 2. degree of curvature is more
• 3. both A and B
• 4. none of the above