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 needed for “level 0” clothing?
1. safety glasses and a hard hat
1. safety glasses only
1. safety glasses, long pants and a long-sleeved shirt
1. safety glasses, long pants and a short-sleeved shirt

Answer 8

3.Safety glasses, long pants and 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 is the approximate temperature of and electric arc?

Answer 10

~29,000 °C

Question 11

Meter category numbers’ general rule is what?

1. That the closer you are to the power source, the higher the category number, and the greater the potential danger from transients.
2. That the further you are to the power source, the higher the category number, and the greater the potential danger from transients.
3. The distance from the power source has no significance to category number.
4. The lower the category number, the lower the internal resistance of the meter

Answer 11

1.That the closer you are to the power source, the higher the category number, and the greater the potential danger from transients.

Question 12

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

Standard circuit breakers don’t open fast enough to protect against shocks, but are made to trip in overcurrent situations (e.g. a short circuit/overload), which often take longer to occur than immediate electrical current going in someone in a shock.

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.