103A Intro to Electrical, Safety Connections & Meters

Question 1

Safe electrical measurement techniques

Answer 1

1. Wear electrical hazard protecting gloves, shoes, and eye protection
2. Use only one hand to move meter leads from point to point
3. Remove power sources while you use ohmeters

Question 2

Circuits as low as _____ can cause death

Answer 2

46 VAC

Question 3

Current flow as little as _____ can kill you

Answer 3

0.25A

Question 4

Heart failure; possible death

Answer 4

100-200mA

Question 5

1A(ampere) =

Answer 5

1000mA (milliamps)

Question 6

Factors affect current on the human body

Answer 6

1. Area of contact
2. Pressure of contact
3. Skin resistance
4. Point of contact

Question 7

Resistance is measured in

Answer 7

Ohms

Question 8

To prevent the electrical hazards of shock and electrocution

Answer 8

1. De-energize
2. Lock out
3. Tag out

Question 9

AFTER you de-energize a circuit, what’s the 3 step voltage test

Answer 9

1. Test the meter to a known voltage
2. Test the equipment circuit to verify that it is de-energized
3. Verify the meter to a known power source again

Question 10

Safety glove colour code

Answer 10

1. Beige - Class 00 - Up to 500 volts
2. Red - Class 0 - Up to 1000 volts

Class 00 & 0 are sufficient for RACM

Question 11

If an electrical shock occurs

Answer 11

1. Remove the victim
2. Prevent further injury
3. Send for qualified help
4. Eliminate the danger
5. Report the incident

Question 12

How many keys can open the lock?

Answer 12

One key only

Question 13

Lockout procedure

Answer 13

1. Notification
2. Shutdown
3. System Shutdown
4. Lock out
5. Tag
6. Recheck
7. Re-energize

Question 14

CAT 3 & 4 are to be the safest instruments for RACM to use

T or F

Answer 14

True
1 & 2 are not sufficient, 4 is sometimes overkill

Question 15

Testing equipment without the CSA marking, no matter what its condition, may be unsafe to use

T or F

Answer 15

True

Question 16

Never use an ohmmeter on an energized circuit

T or F

Answer 16

True

Question 17

_____ generate high-voltage, low-current signals for testing the breakdown strength of electrical insulation resistance(IR)

Answer 17

Megohmmeters

Question 18

One standard for machinery safety states that, for test voltages at 500 VDC, the minimum insulation resistance is 1MO

T or F

Answer 18

True

Question 19

If the amperage reading is lower than your meter’s capability, you can loop the single conductor through the clamp more than once

T or F

Answer 19

True

Amperage = Meter Reading/Number of Loops in Wire

Question 20

You use megohmmeters to test the __________ of electrical insulators

Answer 20

Insulating qualities

Question 21

A megohmmeter produces a _____ voltage output

Answer 21

High

Question 22

Both a true RMS meter and an averaging meter will provide the same reading when you use them with RACM electrical circuits

T or F

Answer 22

False

Question 23

You are using a digital voltmeter to measure voltage. What does it mean if the numbers it displays are flashing on & off?

Answer 23

The range overload setting on the meter is bigger than the measurement

Question 24

What does it mean if a digital meter displays a negative number?

Answer 24

The meter connects in reverse polarity to the DC circuit