B3

Question 1

Electrical Hazards (7)

Answer 1

Machine power cords​

Motors ​

Solenoids ​

Capacitors ​

Generators ​

Batteries ​

Photovoltaic Arrays

Question 2

Hazardous energy types (4)

Answer 2

Electrical
Hydraulic (oil, water)​
Pneumatic (air)
Mechanical (springs, rollers)​

Question 3

When is a piece of equipment considered to have zero electrical potential

Answer 3

When the piece of equipment is Isolated and connected to ground

Question 4

Steps to make a piece of electrical equipment safe

Answer 4

Stop it. Lock it. Check it. Ground it. ​

​

Question 5

How to lock out hydraulic or pneumatic lines

Answer 5

locate the supply valve for the system and lock out the valve

Question 6

different toxic gasses (5)

Answer 6

Carbon Monoxide​

Chlorine ​

Sulphur dioxide ​

Hydrogen Chloride ​

Ammonia

Question 7

Characteristics of hydrogen sulphide

Answer 7

Colourless​

Poisonous ​

Rotten Egg Odour (think Sulfur)​

Found in natural gas ​

Question 8

Characteristics of methane

Answer 8

Explosion is the main danger​

By product of backed up sewers ​

Will displace Oxygen to below the point necessary to sustain life, acting as an asphyxiant

Question 9

different combustible gases (5)

Answer 9

Methane ​
Natural Gas​
​Propane ​
Hydrogen ​
Cleaning Solvents

Question 10

What is LEL and UEL

Answer 10

Lower explosive limit
upper explosive limit
where gasses are no longer combustable

Question 11

Can apprentices lock out

Answer 11

they cant initiate lock out but they can add locks

Question 12

Steps for lock out (4)

Answer 12

Identify the equipment to be shut down​

Test the controls to turn off equipment, wait until it comes to a stop​

Identify the correct electrical source and disconnect it​

 Plugged in equipment ​

 Circuit breakers ​

 Safety switch disconnect ​

Put your personal lock on the switch using a scissor adapter…lock should include ​

a. Name, date, time location and identity of equipment

Question 13

What is the left hand rule

Answer 13

Stand to the right of the switch​

Turn your head to the right, incase the fuse blows​

Use left hand to operate the switch ​

Check the voltage with a voltmeter or voltage tick​

If fuses are used pull the fuses ​

Close the panel door​

Question 14

When do you have to lock out a cord end

Answer 14

When its not in your line of sight

Question 15

When do you use a key box

Answer 15

when multiple machines need to be locked out by multiple people