Basic Air And Electrical Flashcards
What are the 2 types of comeng?
- westcode
- knorr
What are the 4 types of EMU train?
- comeng
- siemens
- x’trapolis
- HCMT
How do you identify a motor and trailer car?
- motor car = m
- trailer car = t
How are the doors and wheels numbered on comeng, siemens and x’trapolis?
Clockwise
What side of the cab does a driver sit on a comeng?
B side
What are the 6 common cab safety equipment?
- first aid kit
- red and green flags
- fire extinguisher
- audible track warning signals (ATWs)
- emergency track circuit jumper cables
- switch stick
What are the 2 main things air (pneumatics) is used for on a train?
- braking systems
- suspension
What do isolating cocks do?
- shut the flow of air on/off
- divert the flow of air
How is the power drawn from the overhead into the train?
Via the pantographs
What 3 ways do EMU trains couple together?
- mechanically
- electrically
- pneumatically
How does ED/rheostatic braking work?
The traction motors act as generators to apply a retarding force
What are the 2 types of brakes all train types have?
- electro-dynamic (ED)/rheostatic
- electro-pneumatic (EP)
What is the extra braking system found on comeng’s?
- automatic air brake
What type of brake do trailer cars have?
- EP (friction) only
What type of suspension do the train types have?
- C, S, H = air bag
- x’trapolis = spring
What are some primary effects of electric shock?
- shock
- burns
- unconsciousness
- respiration stops
- reduction of blood circulation
- death
What steps should you take when tending to electric shock victims?
- safety to yourself
- safety to passengers
- isolate power
- tend to victim
True or false: the unit of measurement for electrical potential is a Volt.
True
What is a volt?
Unit of measurement for electrical potential. (ie. pressure in hose/pipe)
What is Amps (ampere)?
- quantity of current flow. (ie. amount of water in hose/pipe)
What is resistance?
- the drag present in an electrical circuit restricting electrical energy from flowing freely
- (ie. diameter of hose/pipe)
What does AC and DC stand for?
- AC = alternating current
- DC = direct current
What happens when a switch is on or off?
- on = circuit is closed/complete
- off = circuit is open/incomplete
What is used to protect a circuit?
- circuit breakers
Can a circuit breaker be used as a switch to turn equipment on or off?
No
When can a tripped circuit breaker be reset?
- until the reason for the fault has been determined
- if it is safe to do so
What does a compressor do?
Produce compressed air
What do compressor governors do?
- monitors main reservoir pressure
- turns the comperssors on/off
What do reservoirs do?
Store compressed air
What do safety valves do?
Prevents the main reservoir from being overcharged if the compressors fail to stop
What do air dryers do?
Remove water particles, oil and solid particles from the compressed air
What train types have sanders?
- siemens
- HCMT
What train equipment/systems are operated pneumatically?
- friction brakes
- air suspension
- sanding equipment
- whistles
- raising pantograph
- opening and closing saloon doors
- spring park brakes
What train types use air to raise the pantographs?
- comeng
- HCMT
How are doors opened and closed on a comeng?
- pneumatically
What does a spring park brake do?
Stops the train from rolling away
How is the SPB applied?
Reduction of main reservoir air releases the spring and applies the brake
How is the SPB released?
An increase in main reservoir air compresses the spring and releases the brake
What are train whistles used for?
- warning
- communication
What are the 3 ways a pantograph can be raised on a comeng?
- main reservoir
- storage reservoir
- battery operated compressor
How are pantographs raised on the siemens and x’trapolis?
Electric motor
