Railway fundamentals 07 - Electrical

Question 1

What are the 6 primary effects of electric shock?

Answer 1

Shock
Burns
Unconsciousness
Respiration stops
Reduction of blood circulation
Death

Question 2

How do you isolate an electric shock victim?

Answer 2

• check danger to you,bothers and the victim
• isolate the source of the electrical current supply by turning it off or removing the victim from the source

Question 3

The unit of electrical potential is a volt? True or false

Answer 3

True

Question 4

Where is direct current used?

Answer 4

On the contact wire

Question 5

Where is alternating current used

Answer 5

On the transmission wires

Question 6

How does electricity flow?

Answer 6

It flows in a complete circuit returning to the power source

Question 7

What is conductivity?

Answer 7

The ability to flow through materials.

Question 8

What are switches used for?

Answer 8

Used to open and close a circuit

Question 9

If a switch is closed (on) will electricity pass through the wires to the equipment using it?

Answer 9

Yes

Question 10

If a switch is open (off) will equipment receive power?

Answer 10

No

Question 11

What type of system helps protect circuits?

Answer 11

Circuit breaker

Question 12

Can a circuit breaker be used as a switch?

Answer 12

N9

Question 13

Can you reset a circuit breaker before checking the fault?

Answer 13

No

Question 14

What do transformers do?

Answer 14

Transforms energy from high voltage to lower voltage

Question 15

In rail what voltage is initially provided via the transmission wires and then to being used on the trains?

Answer 15

Transmission wires 22000v AC
Contact wires 1500v dc