Basic Air And Electrical

Question 1

What are the 2 types of comeng?

Answer 1

• westcode
• knorr

Question 2

What are the 4 types of EMU train?

Answer 2

• comeng
• siemens
• x’trapolis
• HCMT

Question 3

How do you identify a motor and trailer car?

Answer 3

• motor car = m
• trailer car = t

Question 4

How are the doors and wheels numbered on comeng, siemens and x’trapolis?

Answer 4

Clockwise

Question 5

What side of the cab does a driver sit on a comeng?

Answer 5

B side

Question 6

What are the 6 common cab safety equipment?

Answer 6

• first aid kit
• red and green flags
• fire extinguisher
• audible track warning signals (ATWs)
• emergency track circuit jumper cables
• switch stick

Question 7

What are the 2 main things air (pneumatics) is used for on a train?

Answer 7

• braking systems
• suspension

Question 8

What do isolating cocks do?

Answer 8

• shut the flow of air on/off
• divert the flow of air

Question 9

How is the power drawn from the overhead into the train?

Answer 9

Via the pantographs

Question 10

What 3 ways do EMU trains couple together?

Answer 10

• mechanically
• electrically
• pneumatically

Question 11

How does ED/rheostatic braking work?

Answer 11

The traction motors act as generators to apply a retarding force

Question 12

What are the 2 types of brakes all train types have?

Answer 12

• electro-dynamic (ED)/rheostatic
• electro-pneumatic (EP)

Question 13

What is the extra braking system found on comeng’s?

Answer 13

• automatic air brake

Question 14

What type of brake do trailer cars have?

Answer 14

• EP (friction) only

Question 15

What type of suspension do the train types have?

Answer 15

• C, S, H = air bag
• x’trapolis = spring

Question 16

What are some primary effects of electric shock?

Answer 16

• shock
• burns
• unconsciousness
• respiration stops
• reduction of blood circulation
• death

Question 17

What steps should you take when tending to electric shock victims?

Answer 17

• safety to yourself
• safety to passengers
• isolate power
• tend to victim

Question 18

True or false: the unit of measurement for electrical potential is a Volt.

Answer 18

True

Question 19

What is a volt?

Answer 19

Unit of measurement for electrical potential. (ie. pressure in hose/pipe)

Question 20

What is Amps (ampere)?

Answer 20

• quantity of current flow. (ie. amount of water in hose/pipe)

Question 21

What is resistance?

Answer 21

• the drag present in an electrical circuit restricting electrical energy from flowing freely
• (ie. diameter of hose/pipe)

Question 22

What does AC and DC stand for?

Answer 22

• AC = alternating current
• DC = direct current

Question 23

What happens when a switch is on or off?

Answer 23

• on = circuit is closed/complete
• off = circuit is open/incomplete

Question 24

What is used to protect a circuit?

Answer 24

• circuit breakers

Question 25

Can a circuit breaker be used as a switch to turn equipment on or off?

Answer 25

No

Question 26

When can a tripped circuit breaker be reset?

Answer 26

- until the reason for the fault has been determined - if it is safe to do so

Question 27

What does a compressor do?

Answer 27

Produce compressed air

Question 28

What do compressor governors do?

Answer 28

- monitors main reservoir pressure - turns the comperssors on/off

Question 29

What do reservoirs do?

Answer 29

Store compressed air

Question 30

What do safety valves do?

Answer 30

Prevents the main reservoir from being overcharged if the compressors fail to stop

Question 31

What do air dryers do?

Answer 31

Remove water particles, oil and solid particles from the compressed air

Question 32

What train types have sanders?

Answer 32

- siemens - HCMT

Question 33

What train equipment/systems are operated pneumatically?

Answer 33

- friction brakes - air suspension - sanding equipment - whistles - raising pantograph - opening and closing saloon doors - spring park brakes

Question 34

What train types use air to raise the pantographs?

Answer 34

- comeng - HCMT

Question 35

How are doors opened and closed on a comeng?

Answer 35

- pneumatically

Question 36

What does a spring park brake do?

Answer 36

Stops the train from rolling away

Question 37

How is the SPB applied?

Answer 37

Reduction of main reservoir air releases the spring and applies the brake

Question 38

How is the SPB released?

Answer 38

An increase in main reservoir air compresses the spring and releases the brake

Question 39

What are train whistles used for?

Answer 39

- warning - communication

Question 40

What are the 3 ways a pantograph can be raised on a comeng?

Answer 40

- main reservoir - storage reservoir - battery operated compressor

Question 41

How are pantographs raised on the siemens and x'trapolis?

Answer 41

Electric motor