Basic Air and Electricity - BAE + EMU

Question 1

What are the common pneumatic components of all EMU’s?

Answer 1

Compressors
Reservoirs
Safety relief valve
Air dryers

Question 2

What do the compressors do?

Answer 2

Supply’s compressed air to the reservoirs

Question 3

What do the reservoirs do?

Answer 3

Stores compressed air produced by the compressors.

Question 4

What does a compressor governor do?

Answer 4

Monitors the main reservoir pressure & turns compressors on/off as required.

Question 5

What do safety valves do?

Answer 5

Prevent reservoirs from overcharging if the compressor fails to stop. Located on the main reservoir.

Question 6

What do air dryers do?

Answer 6

Removes oil, dirt and water particles from the compressed air

Question 7

What are the 4 trains operated by Metro?

Answer 7

Comeng
Siemens
X’Trapolis
HCMT (High Capacity Metro Train)

Question 8

What does the M and T stand for on the Comeng/Siemens/X’Trapolis?

Answer 8

M - Motor Car
T - Trailer Car

Question 9

When entering the Drivers Cab from the ground, what can you not be wearing? And where is it to be placed?

Answer 9

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.

Question 10

What is required (for safety) when climbing up into the Cab from the ground?

Answer 10

3 Points of contact at all time

Question 11

When exiting the Drivers Cab, what must you do before climbing down?

Answer 11

Look to ensure the exit point is clear and no hazards are visible before descending.

Question 12

What are 3 safety things you must never do while the train is in motion?

Answer 12

1. Never ride on the steps
2. Do not ride on the side of the train
3. Do not allow any part of your body to protrude from the cab

Question 13

How are doors numbered?

Answer 13

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)

Question 14

What train cab is this? And where is the master controller located?

Answer 14

Comeng
Master controller is located on the right, however the brake system is on the left.

Question 15

What train cab is this? Where is the master controller located?

Answer 15

Siemens
Located on the left (break and master controller combined)

Question 16

Which train has the master controller/brake on the right?

Answer 16

X’Trapolis

Question 17

What common safety equipment is found in all train types?

Answer 17

1. First Aid Kits
2. Red & Green Flags
3. Fire Extinguishers
4. Audible Track Warning Signals (ATWS)
5. Emergency Track Circuit Jumper Cables
6. Switch Stick

Question 18

What key opens the ATWS?

Answer 18

5P Key

Question 19

What 2 main systems use Pneumatics?

Answer 19

Braking
Suspension systems (Comeng/Siemens/HCMT)

Question 20

What are Isolating Cocks used for?

Answer 20

Used to enable and disable the flow of pressurised air.
They can turn equipment on or off, or redirect compressed air.

Question 21

If the handle of an Isolating Cock is aligned with the pipe, is it open or closed?

Answer 21

Opened

Question 22

Where is electrical power drawn from?

Answer 22

The Pantograph when raised against the contact wire.

Question 23

What are the 3 ways couplers connect trains?

Answer 23

Mechanical
Pneumatic
Electrical

Question 24

What are the two main breaking types found on the X’Trapolis, Siemens & HCMT?

Answer 24

Electro-Dynamic (rheostatic)
Electro Pneumatic (friction break)

Question 25

What 3rd break type is found only on the Comeng?

Answer 25

Auto Air Break

Question 26

What are the 2 types of suspensions used and which train use them?

Answer 26

X'Trapolis - Spring suspension Comeng/Siemens/HCMT - Air Bag suspension

Question 27

What are the 6 primary effects of electric shock?

Answer 27

1. Shock 2. Burns 3. Unconsciousness 4. Respiration Stops 5. Reduction of blood circulation 6. Death

Question 28

What is a Volt?

Answer 28

The unit of measurement for electrical potential.

Question 29

What is the unit of measurement that describes the quantity of current flow?

Answer 29

Ampere (Amps)

Question 30

What does Resistance refer to?

Answer 30

The drag present in an electrical circuit that restricts the electric energy from flowing freely.

Question 31

What term describes a material in which electricity can flow?

Answer 31

Conductivity

Question 32

When a switch is closed, will electricity flow?

Answer 32

Yes

Question 33

True or False? An open switch will not allow electricity to flow

Answer 33

True

Question 34

What is in every EMU that protects from electrical faults?

Answer 34

Circuit breakers

Question 35

True or False? Circuit breaks should be used as switches to turn equipment on or off?

Answer 35

False, they should NEVER be used as switches

Question 36

Can you reset a circuit breaker if you do not know why it tripped?

Answer 36

No, you can only reset the circuit breaker once the fault has been determined and it is considered safe to reset.

Question 37

How does ED/Rheostatic breaking work?

Answer 37

It uses a magnetic field within the traction motor to provide resistance.

Question 38

What 7 systems use Pneumatics? (Across all train types)

Answer 38

1. Friction Breaking (Electro Pneumatic) 2. Air suspension systems (Comeng/HCMT/Siemens 3. Sanding equipment (Siemens/HCMT) 4. Whistles 5. Pantograph Raising (Comeng) 6. Saloon doors opening/closing (Comeng) 7. Spring Park Brake Systems

Question 39

What is a Spring Park Brake?

Answer 39

Fail-safe system that stops the train running away. It uses a mechanical spring force to apply. Pneumatic pressure to release.

Question 40

What are the two main purposes of whistles?

Answer 40

1. Warning 2. Communication

Question 41

What are the 3 ways compressed air can be used to raise the Comeng Pantograph?

Answer 41

1. Main reservoir 2. Storage reservoir 3. Battery operated compressor

Question 42

How are the pantographs raised on the X'Trap/Siemens?

Answer 42

With an electric motor

Question 43

How are the saloon doors closed on the train types?

Answer 43

Comeng - Pneumatic actuators Siemens/X'Trapolis/HCMT - Electric motor

Question 44

What does VICERS stand for?

Answer 44

Vigilance Control and Event Recording System

Question 45

Where are Trip Apparatus located?

Answer 45

On the B side of the motor car on the no. 1 axle

Question 46

What form of coupler connects a Motor car to a Trailer car?

Answer 46

Semi Permanent Coupler

Question 47

What is a Bogie?

Answer 47

A chassis/framework carrying wheels which is attached to the vehicle.

Question 48

Where are first aid kits found on the trains?

Answer 48

Motor Cabs where the First Aid symbol is displayed outside the Cab door

Question 49

In which cab does the driver sit on the B side?

Answer 49

Comeng

Question 50

Which cab does the driver sit in the centre?

Answer 50

X'Trapolis

Question 51

In which cabs does the driver sit on the B side but in a more central position?

Answer 51

Siemens and HCMT

Question 52

How many saloon doors do Siemens have per carriage?

Answer 52

4

Question 53

What are the two kinds of reservoirs on an EMU?

Answer 53

The trains have both main reservoirs and auxillary/supplementary reservoirs.