CSLB C10 TEST 1: MULTIPLE CHOICE

CSLB C10 TEST 1: MULTIPLE CHOICE

120 Questions with Answers and Rationales

• What do you not take into consideration when doing load

demand calculations?A. Small portable heating and cooling appliances B. Large HVAC systems C. Lighting circuits D. Kitchen appliances

Answer: A

Rationale: Small portable heating and cooling appliances are

excluded from load calculations per NEC guidelines because they are not permanently installed.

2. The symbol represents a:

A. Relay coil B. Transformer C. Capacitor D. Resistor

Answer: A

Rationale: The symbol depicted in electrical diagrams for a

relay coil is standardized and distinct from other components.

• A fixture that weighs more than ___ must be supported

independently of an outlet box.A. 30 lb.B. 40 lb.C. 50 lb.D. 60 lb.

Answer: C

Rationale: NEC 314.27 requires fixtures over 50 lb. to have

independent support to prevent strain on the outlet box. 1 / 3

• What is the minimum working clearance from an electrical

panel under 600 V?A. 24" B. 30" C. 36" D. 42"

Answer: C

Rationale: NEC 110.26 mandates 36" of clear working space

for panels under 600 V for safety and accessibility.

5. Voltage drop in wire is a function of:

A. Wire gauge B. Length of wire C. Current flow in the wire D. All of the above

Answer: D

Rationale: Voltage drop depends on resistance (wire gauge

and length) and current (Ohm’s Law: V = I × R).

• A 12-volt DC, 13-watt fluorescent light is controlled by a

photocell. The average daily on-time is 12 hours. How many watt-hours are consumed daily?

A. 120

B. 144

C. 156

D. 180

Answer: C

Rationale: 13 watts × 12 hours = 156 watt-hours.

• Where may you use nonmetallic-sheathed cable?

A. Inside floors and walls B. Outdoors exposed to sunlight C. In concrete slabs D. In hazardous locations

Answer: A

Rationale: NM cable is permitted in dry, concealed locations

like floors and walls (NEC 334.10).

• What is the maximum permitted distance between

convenience outlets in kitchens? 2 / 3

A. 6'

B. 12'

C. 18'

D. 24'

Answer: B

Rationale: NEC 210.52 requires outlets spaced no more than

12' apart in kitchens to minimize cord use.

9. The minimum permitted size fixture wire is:

A. No. 16 B. No. 18 C. No. 20 D. No. 22

Answer: B

Rationale: NEC 402.6 allows No. 18 AWG for fixture wiring in

most applications.

• What is an Erickson coupling used for?

A. Connecting rigid conduit when one section cannot be turned B. Joining flexible conduit C. Grounding EMT D. Sealing underground conduit

Answer: A

Rationale: Erickson couplings are designed for rigid conduit

connections where rotation is impossible.

• The smallest size grounding conductor permitted for

service entrance is:

A. No. 6 copper B. No. 8 copper C. No. 10 copper D. No. 12 copper

Answer: B

Rationale: NEC 250.66 specifies No. 8 copper as the minimum

for service grounding conductors.

• For an electric appliance with a 17.5 A load, the

overcurrent device must not exceed:

A. 20 amps B. 25 amps C. 30 amps

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