California Electrical Contractor License Practice Test - Free 20 Questions

Question 1

To measure voltage at a motor terminal- the voltmeter leads should be placed in:

Accepted Answer

Parallel

Answer

Series

Answer

Tandem

Answer

Series-Parallel

Question 2

When is it safe to use an ohmmeter to check for continuity?

Accepted Answer

When the power is turned OFF

Answer

Only on 480V circuits

Answer

During a lightning storm

Answer

When the circuit is under full load

Question 3

Typical 'Locked Rotor Amps' (LRA) for a motor can be as high as ____ of the Full Load Amps (FLC)?

Accepted Answer

600% to 800%

Answer

100%

Answer

0%

Answer

50%

Question 4

The most effective way to prevent electrical shock while troubleshooting is to:

Accepted Answer

Establish an electrically safe work condition (LOTO)

Answer

Use a wooden ladder

Answer

Stand on one foot

Answer

Wear thicker gloves

Question 5

What should be done when finding white- crusty buildup on lead-acid battery terminals?

Accepted Answer

Clean with baking soda and water

Answer

Spray it with oil

Answer

Scrape it with a knife

Answer

Wrap it in tape

Question 6

A 3-phase motor is 'Single Phasing' when:

Accepted Answer

One phase of the supply is open

Answer

Blown fuse on all three phases

Answer

Reversed polarity

Answer

Low voltage on Phase B only

Question 7

Which test is most effective for detecting moisture in motor windings?

Accepted Answer

Test insulation resistance (Megger)

Answer

Check battery charging

Answer

Check voltage

Answer

Measure low resistance

Question 8

An 'Infrared Thermograph' is useful in troubleshooting to:

Accepted Answer

Identify loose or corroded connections by heat signature

Answer

See through conduit

Answer

Detect DC current

Answer

Measure depth

Question 9

How can you tell a fuse is 'Good' using an ohmmeter (power OFF)?

Accepted Answer

Continuity (near 0 Ohms) means good

Answer

0 Amps means good

Answer

Infinite resistance means good

Answer

Voltage of 120V means good

Question 10

When testing a good capacitor with an analog ohmmeter- the needle should:

Accepted Answer

Resistance should slowly increase from near-zero toward infinity

Answer

Infinite Ohms immediately

Answer

Fluctuating between 10 and 20 Ohms

Answer

Zero Ohms constantly

Question 1 of 159

To measure voltage at a motor terminal- the voltmeter leads should be placed in: