Basic Air and Electricity - BAE + EMU Flashcards
What are the common pneumatic components of all EMU’s?
Compressors
Reservoirs
Safety relief valve
Air dryers
What do the compressors do?
Supply’s compressed air to the reservoirs
What do the reservoirs do?
Stores compressed air produced by the compressors.
What does a compressor governor do?
Monitors the main reservoir pressure & turns compressors on/off as required.
What do safety valves do?
Prevent reservoirs from overcharging if the compressor fails to stop. Located on the main reservoir.
What do air dryers do?
Removes oil, dirt and water particles from the compressed air
What are the 4 trains operated by Metro?
Comeng
Siemens
X’Trapolis
HCMT (High Capacity Metro Train)
What does the M and T stand for on the Comeng/Siemens/X’Trapolis?
M - Motor Car
T - Trailer Car
When entering the Drivers Cab from the ground, what can you not be wearing? And where is it to be placed?
You cannot wear your Backpack while climbing up into the Cab.
Take it off your back and put it into the Cab, making sure to leave the doorway clear before you climb up.
What is required (for safety) when climbing up into the Cab from the ground?
3 Points of contact at all time
When exiting the Drivers Cab, what must you do before climbing down?
Look to ensure the exit point is clear and no hazards are visible before descending.
What are 3 safety things you must never do while the train is in motion?
- Never ride on the steps
- Do not ride on the side of the train
- Do not allow any part of your body to protrude from the cab
How are doors numbered?
Door 1 is located on side A (RHS to driver), doors are numbered clockwise.
Eg. A side has 1,2,3 (Comeng/X’Trapolis)
B side has 4,5,6 (6 is LHS behind drivers cab)
What train cab is this? And where is the master controller located?
Comeng
Master controller is located on the right, however the brake system is on the left.
What train cab is this? Where is the master controller located?
Siemens
Located on the left (break and master controller combined)
Which train has the master controller/brake on the right?
X’Trapolis
What common safety equipment is found in all train types?
- First Aid Kits
- Red & Green Flags
- Fire Extinguishers
- Audible Track Warning Signals (ATWS)
- Emergency Track Circuit Jumper Cables
- Switch Stick
What key opens the ATWS?
5P Key
What 2 main systems use Pneumatics?
Braking
Suspension systems (Comeng/Siemens/HCMT)
What are Isolating Cocks used for?
Used to enable and disable the flow of pressurised air.
They can turn equipment on or off, or redirect compressed air.
If the handle of an Isolating Cock is aligned with the pipe, is it open or closed?
Opened
Where is electrical power drawn from?
The Pantograph when raised against the contact wire.
What are the 3 ways couplers connect trains?
Mechanical
Pneumatic
Electrical
What are the two main breaking types found on the X’Trapolis, Siemens & HCMT?
Electro-Dynamic (rheostatic)
Electro Pneumatic (friction break)
What 3rd break type is found only on the Comeng?
Auto Air Break
What are the 2 types of suspensions used and which train use them?
X’Trapolis - Spring suspension
Comeng/Siemens/HCMT - Air Bag suspension
What are the 6 primary effects of electric shock?
- Shock
- Burns
- Unconsciousness
- Respiration Stops
- Reduction of blood circulation
- Death
What is a Volt?
The unit of measurement for electrical potential.
What is the unit of measurement that describes the quantity of current flow?
Ampere (Amps)
What does Resistance refer to?
The drag present in an electrical circuit that restricts the electric energy from flowing freely.
What term describes a material in which electricity can flow?
Conductivity
When a switch is closed, will electricity flow?
Yes
True or False? An open switch will not allow electricity to flow
True
What is in every EMU that protects from electrical faults?
Circuit breakers
True or False? Circuit breaks should be used as switches to turn equipment on or off?
False, they should NEVER be used as switches
Can you reset a circuit breaker if you do not know why it tripped?
No, you can only reset the circuit breaker once the fault has been determined and it is considered safe to reset.
How does ED/Rheostatic breaking work?
It uses a magnetic field within the traction motor to provide resistance.
What 7 systems use Pneumatics? (Across all train types)
- Friction Breaking (Electro Pneumatic)
- Air suspension systems (Comeng/HCMT/Siemens
- Sanding equipment (Siemens/HCMT)
- Whistles
- Pantograph Raising (Comeng)
- Saloon doors opening/closing (Comeng)
- Spring Park Brake Systems
What is a Spring Park Brake?
Fail-safe system that stops the train running away.
It uses a mechanical spring force to apply.
Pneumatic pressure to release.
What are the two main purposes of whistles?
- Warning
- Communication
What are the 3 ways compressed air can be used to raise the Comeng Pantograph?
- Main reservoir
- Storage reservoir
- Battery operated compressor
How are the pantographs raised on the X’Trap/Siemens?
With an electric motor
How are the saloon doors closed on the train types?
Comeng - Pneumatic actuators
Siemens/X’Trapolis/HCMT - Electric motor
What does VICERS stand for?
Vigilance Control and Event Recording System
Where are Trip Apparatus located?
On the B side of the motor car on the no. 1 axle
What form of coupler connects a Motor car to a Trailer car?
Semi Permanent Coupler
What is a Bogie?
A chassis/framework carrying wheels which is attached to the vehicle.
Where are first aid kits found on the trains?
Motor Cabs where the First Aid symbol is displayed outside the Cab door
In which cab does the driver sit on the B side?
Comeng
Which cab does the driver sit in the centre?
X’Trapolis
In which cabs does the driver sit on the B side but in a more central position?
Siemens and HCMT
How many saloon doors do Siemens have per carriage?
4
What are the two kinds of reservoirs on an EMU?
The trains have both main reservoirs and auxillary/supplementary reservoirs.
