Question: For which of the following locomotives the maintenance requirements are the least ?

• 1. Steam locomotives
• 2. Diesel locomotives
• 3. Electric locomotives
• 4. Equal in all of the above

Question: Power for lighting in passanger coach, in a long distance electric train, is provided_________________?

• 1. directly through overhead electric line
• 2. through individual generator of bogie and batteries
• 3. through rails
• 4. through locomotive

Question: Which of the following happens in Kando system ?

• 1. Three phase AC is converted into DC
• 2. Single phase AC is converted into DC
• 3. Single phase supply is converted into three phase system
• 4. None of the above

Question: If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?

• 1. 0.3
• 2. 0.26
• 3. 0.225
• 4. 0.16

Question: The coasting retardation is around_________________?

• 1. 0.16 km phps
• 2. 1.6 km phps
• 3. 16 km phps
• 4. 40 km phps

Question: The braking retardation is usually in the range__________________?

• 1. 0.15 to 0.30 km phps
• 2. 0.30 to 0.6 km phps
• 3. 0.6 to 2.4 km phps
• 4. 3 to 5 km phps

Question: Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?

• 1. Reduced current method
• 2. Tap changing control of transformer
• 3. Series parallel operation of motors
• 4. All of the above

Question: The rate of acceleration on suburban orurban service is in the range_________________?

• 1. 0.2 to 0.5 km phps
• 2. 1.6 to 4.0 km phps
• 3. 5 to 10 km phps
• 4. 15 to 25 km phps

Question: _______________watt-hours per tonne km is usually the specific energy consumption for suburban services?

• 1. 15—20
• 2. 50—75
• 3. 120—150
• 4. 160—200

Question: Low resistivity materials are used in__________?

• 1. transformer, motor and generator windings
• 2. transmission and distribution lines
• 3. house wiring
• 4. all above applications