C10 T EXAM WITH CORRECT QUESTIONS AND ANSWERS 2025

C10 T EXAM WITH CORRECT
QUESTIONS AND ANSWERS 2025

 Question #: 1: When troubleshooting a motor capacitor, the meter pegs to the right and

stays there. What does this indicate? - CORRECT-ANSWERSCorrect answer: bad

capacitor

 Additional Notes: If the capacitor were good, the needle would peg to the right, then

slowly drop back down.

 Question #: 2: On a 480 V, three-phase blower motor with auxiliary contacts and

indicators, the push button start is off due to a thermal overload. What is the most likely

cause? - CORRECT-ANSWERSCorrect answer: overloaded motor

 When installing a fire alarm system bell or horn, how far above grade should it be

mounted? - CORRECT-ANSWERS7'-6"

 Additional Notes: The top of the device should be at least 7'-6" above the finished floor

and at least 6" below the finished ceiling. If the ceiling height is too low to allow the

recommended mounting heights, the device can be mounted at a lower height, or on the

ceiling.

 What is the minimum length of a grounding rod? - CORRECT-ANSWERS8'

 When testing a GFCI trip, probe conductor and fixture ground, use: - CORRECT-

ANSWERSinductive voltage tester

 On a walk-through of a new home, the owner wants you to install an outlet beside the

stove. The counter top is 48" long and the wall is 6' away. The contractor - CORRECT-

ANSWERSwould need to install 2 outlets

, What is the maximum allowed gap allowed around a box in a wall finished with drywall?

- CORRECT-ANSWERSCorrect answer: 1/8"

 Additional Notes: Plaster, drywall, or plasterboard surfaces must not have gaps or open

spaces greater than 1/8" at the edge of a box or fitting.

 What is the minimum number of branch circuits required at each patient bed location? -

CORRECT-ANSWERSCorrect answer: two; one from the emergency electrical system

and the other from the normal system

 When can you have an isolated ground passing through a panel without connecting it to

that panel's equipment grounding terminal bar? - CORRECT-ANSWERSCorrect answer:

when you are reducing vibration and noise on the ground

 Additional Notes: When installing an isolated ground receptacle the insulated equipment

grounding conductor is run with the circuit conductors directly back to the main service

disconnect. Metal boxes and raceways must still be grounded.

 Which of the following could cause a significant increase to the bid amount on a job at an

automotive repair shop? - CORRECT-ANSWERSCorrect answer: the service pit is

inadequately ventilated

 Additional Notes: The entire area of repair garages, up to a level of 18" above the floor,

are Class I, Division 2, locations. Any depression below floor level (such as a service pit)

is also a Class I, Division 2, location unless it is unvented in which case it may be

considered a Class I, Division 1, location and require special fittings.

 What would you use in a capacitive reactance circuit to balance the circuit? - CORRECT-

ANSWERSinductor

,  Which of the following NEMA rating should be used for temporary construction power

enclosures outside? - CORRECT-ANSWERSCorrect answer: NEMA 3R

 Additional Notes: Enclosures with a NEMA rating of 3R is designed for indoor or

outdoor use. Enclosures with ratings of 1, 2, or 12 are designed for indoor use only.

 What is the full-load current rating of a 208-volt, 50-horsepower, three-phase squirrel-

cage motor? - CORRECT-ANSWERSCorrect answer: 103 amps

 Additional Notes: To find the amperage of a three-phase motor when you know the

horsepower you use a variation of Watt's Law:

 I = (horsepower x 746 watts/horsepower) / (E x 1.73)

 I = (50 hp x 746 watts/hp) / (208 volts x 1.73) = 37,300 watts / 360 volts = 103 amps

 When connecting conduit in a hazardous area, what do you use in order to prevent the

passage of gasses, vapors, or flames? - CORRECT-ANSWERSCorrect answer: seal-off

fitting

 When a house heater comes on, some lights get bright, others get dim. What could cause

this? - CORRECT-ANSWERSCorrect answer: bad neutral connection

 What is the difference between a grounded conductor and a grounding conductor? -

CORRECT-ANSWERSCorrect answer: a grounded conductor is a circuit conductor that

is intentionally grounded and a grounding conductor is a conductor that is used to connect

the grounded circuit to a grounding electrode

 How do you test a GFCI? - CORRECT-ANSWERSCorrect answer: press the test button

 Additional Notes: All GFCI outlets come with a "test" button that induces a small

ground. To test, plug in a light, turn it on and press the "test" button. The button should

pop out and the light should go out. (Sometimes only ONE of these things will happen!)