Post lab quiz Safety Test questions

Question 1

What can happen if a multimeter is set for DC volts and you’re connected to an AC circuit?

Answer 1

the meter will read low (close to zero)

Question 2

What is the lowest distribution voltage used by utilities?

Answer 2

2,400 V

Question 3

Which of the following is true of an arc flash incident?
1. Electrical equipment can be vapourised
2. Only people touching the equipment can be injured
3. Flying debris cause most injuries
4. Burns cause all injuries

Answer 3

1. Electrical equipment can be vapourised

Question 4

How can tiny cuts and blisters make a shock worse?

Answer 4

They expose the more conductive tissue beneath the surface skin.

Question 5

When should you use the emergency power off button?

Answer 5

If you think someone is getting a shock.

Question 6

What should be done if you have a defective piece of equipment?

Answer 6

Report the problem to the lab instructor.

Question 7

In which of the following situations can you do live electrical work?
1. to avoid interrupting people’s work schedules
2. never
3. there was a large savings to a customer
4. troubleshooting

Answer 7

2.never

Question 8

Which is for “level 0” clothing?
1. safety glasses + a hard hat
2. safety glasses
3. safety glasses + long pants + a long-sleeved shirt
4. safety glasses + long pants + a short-sleeved shirt

Answer 8

4. Safety glasses + long pants + a long-sleeved shirt is needed for level 0 clothing.

Question 9

At what current does a GFCI open?

Answer 9

5 milliamps (mA)

Question 10

What’s the temperature of electric arc?

Answer 10

~29,000 °C

Question 11

Meter category numbers’ general rule is what?

Answer 11

The closer one is to a power source, the higher the category number and greater the potential danger from transients.

Question 12

When using hand tools, you should…?
1. consider what happens if you slip
2. make sure you are using the correct tool for the job
3. make sure the tool is in good working order
4. all of the above

Answer 12

4. all of the above.

Question 13

When must you use meter leads with a meter? (not banana leads)
1. never
2. if the meter was being moved
3. while the circuit is energised to measure the voltage of fruit other than bananas
4. if the meter is set to volts

Answer 13

4.if the meter is being moved while the circuit is energised

Question 14

What are the requirements to safely take a voltage measurement on an unknown live circuit?
1. a functional meter
1. safety glasses and voltage rated gloves with protectors
1. proper test leads
1. all of the above

Answer 14

4.all of the above

Question 15

What does “GFCI” stand for?

Answer 15

Ground Fault Circuit Interrupter

Question 16

When “testing for voltage” with the t³ method, what’s the 1st step?
1. visually inspect the meter and leads
1. test the meter on a live circuit
1. test for voltage at the piece of equipment you will be working on
1. test the meter on a circuit you know is dead

Answer 16

2.test the meter on a live circuit

Question 17

Which of these is true?
1. The tissue beneath your skin has high resistance.
1. Skin has low resistance.
1. Skin has high resistance.
1. The body has almost no resistance.

Answer 17

3.Skin has high resistance.

Question 18

When must yellow, fused lead be used in the lab?

Answer 18

all circuits operating at 208 volts between phases

Question 19

What issue can we have with level 4 arc flash protective clothing?

Answer 19

• reduced mobility
• heat stress
• weight
• discomfort

Question 20

At what current does ventricular fibrillation occur?

Answer 20

100 milliamps (mA)

Question 21

When are voltage rated gloves with protectors used?
1. when measuring voltages with circuit voltage over 50V
1. when measuring unknow voltages with exposed circuit
1. when functionally testing an externally operable circuit
1. both 1st and 2nd answer

Answer 21

4.both 1st and 2nd answer

Question 22

Why do standard circuit breakers not protect against shocks?

Answer 22

They react too slow and protects ony cables against overload, which stops high damage.

Question 23

What’s often the maximum safe voltage for live work?

Answer 23

~50 volts (V)

Question 24

Which of these is true of an arc flash incident?
1. Flying debris causes most injuries.
1. Only people touching the equipment can be injured.
1. Burns cause all injuries.
1. Your eardrums can be ruptured.

Question 25

Which meter setting needs the meter connected in series with the load?

Answer 25

amps

Question 26

What’s the max voltage to ground in a small dwelling unit under a CEC?

Answer 26

150 volts

Question 27

What’s the max voltage to ground in a dwelling unit in a big apartment under a CEC?

Answer 27

347 volts

Question 28

What voltage is used to supply heavy loads in a house?

Answer 28

In North America, 240 volts is the voltage used to supply heavy loads in a house.

Question 29

What voltage typically supplies a house’s transformer?

Answer 29

2400-8000 volts

Question 30

In which conductor(s) are fuses connected?

Answer 30

A fuse is always connected in a circuit’s live wire/or ungrounded conductor.

Question 31

What is the max voltage to ground in a house in North America?

Answer 31

~120-150 volts

Question 32

What term describes the rod, plate or pipe connecting an electrical system to ground?

Answer 32

grounding electrode

Question 33

How do insulated gloves protect electrical workers?

Answer 33

by increasing the electrial path’s resistance through the worker

Question 34

What does a shock’s severity depend upon?

Answer 34

current in amps, the path and duration

Question 35

What does a receptacle cover do?

Answer 35

stops direct contact

Question 36

What’s needed for doors to electrical equipment vaults?

Answer 36

a warning sign