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CSLB C10 Test 1 Questions and Answers
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CSLB C10 Test 1 Questions and Answers
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CSLB C10 Test 1 Questions and Answers____ size screws are needed to fasten a plug receptacle to a box. - ANSWER-No. 6-32
_____ size screws are required for mounting light fixtures. - ANSWER-No. 8-32
50 kVA would be used in which of the following? - ANSWER-warehouse
65 street lights are fed by a 2275-volt series circuit. What is the voltage across each
light? - ANSWER-35 V
A 110 W lamp is connected to a 220 V line. What is the resistance? - ANSWER-440
ohms
A 12-volt direct current, 13-watt fluorescent light is controlled by a photocell. The
average daily on-time is 12 hours per day. How many watt-hours are consumed by the
light on an average day? - ANSWER-156
A 5 kW appliance is used for 5 hours. At $0.014 per kWh, the cost of running the
appliance is: - ANSWER-$0.35
A 50 kVA transformer supplies 480 V and 40 A. What is its kW rating? - ANSWER-kW
[single phase] = (E x I)/1000 = (480 V x 40 A)/1000 = 19.2 kW
A contractor discovers a serious code violation on an approved set of plans. -
ANSWER-The work must stop until the contractor reports the violation and has the
plans corrected.
A fixture that weighs more than ______ must be supported independently of an outlet
box. - ANSWER-50 lb.
A house is approximately 2300 sq ft and has all-electric major and minor appliances
(e.g., washer, dryer, furnace, and A/C). The ground conductor for the above system is
at least: - ANSWER-No. 8
A service drop entered and exited a building en route to another building. The electrical
contractor that installed the service drop proceeded: - ANSWER-incorrectly: The second
building needs its own service.
After a major accident, Cal/OSHA must investigate within: - ANSWER-3 days
After installing a new A/C how would you test it? - ANSWER-turn on the breaker and
check voltage
All of the following can be used to measure ground resistance except a(n): - ANSWER-
transformer
, An ammeter must be connected in _________ with the load. - ANSWER-series
An appliance on a 20-amp branch circuit should not draw more than: - ANSWER-16
amps
An example of inductive dielectric heating is a(n): - ANSWER-microwave
Bending conduit is best done with a: - ANSWER-field hickey
Cal/OSHA requires guardrails for scaffolds over _____ in height. - ANSWER-7-½'
Electrical continuity at a service entrance can be assured by using the following: -
ANSWER-pressure connectors, threaded couplings, threadless couplings
For an electric appliance with a 17.5 A load, the overcurrent device must not exceed: -
ANSWER-25 amps
For how much of the normal ampacity must branch circuit conductors supplying
continuous loads be sized? - ANSWER-125%
How long of a tail should you leave for Romex in a box? - ANSWER-6"
How many 1250-watt appliances can be used on a 50-amp, 120-volt branch circuit? -
ANSWER-50 A x 120 V = 6000 W 6000 W ÷ 1250 W = 4.8 (4 appliances)
How many No. 12 conductors should there be in a 4-11/16" box with 42 cu in? -
ANSWER-18
How would you use Ohm's law formula to find resistance? - ANSWER-R = E ÷ I
Resistance=volts/amperes
If a co-worker falls down and suffers a deep, bleeding gash to the head, you should: -
ANSWER-apply direct pressure to the wound
If a colleague is lying unconscious on a high-tension wire, how should you help? -
ANSWER-grab by any part of dry clothes except shoes
If a No. 8 copper conductor is rated at 50 amps, what would be the corresponding
aluminum wire size? - ANSWER-No. 6
If an electrical sub-contractor finds a conflict in the plans who should he/she contact? -
ANSWER-prime contractor
If the plumber accidentally cuts installed wires, to whom should you report the problem?
- ANSWER-general contractor
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