C10 T Exam UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS
Question #: 1: When troubleshooting a motor capacitor, Correct answer: bad capacitor
the meter pegs to the right and stays there. What does Additional Notes: If the capacitor were good, the needle would peg to the right,
this indicate? then slowly drop back down.
Question #: 2: On a 480 V, three-phase blower motor with Correct answer: overloaded motor
auxiliary contacts and indicators, the push button start is
off due to a thermal overload. What is the most likely
cause?
When installing a fire alarm system bell or horn, how far 7'-6"
above grade should it be mounted? 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? 8'
When testing a GFCI trip, probe conductor and fixture inductive voltage tester
ground, use:
On a walk-through of a new home, the owner wants you would need to install 2 outlets
to install an outlet beside the stove. The counter top is
48" long and the wall is 6' away. The contractor
, What is the maximum allowed gap allowed around a box Correct answer: 1/8"
in a wall finished with drywall? 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 Correct answer: two; one from the emergency electrical system and the other
at each patient bed location? from the normal system
When can you have an isolated ground passing through a Correct answer: when you are reducing vibration and noise on the ground
panel without connecting it to that panel's equipment Additional Notes: When installing an isolated ground receptacle the insulated
grounding terminal bar? 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 Correct answer: the service pit is inadequately ventilated
to the bid amount on a job at an automotive repair shop? 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 inductor
balance the circuit?
Which of the following NEMA rating should be used for Correct answer: NEMA 3R
temporary construction power enclosures outside? 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- Correct answer: 103 amps
horsepower, three-phase squirrel-cage motor? 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 Correct answer: seal-off fitting
you use in order to prevent the passage of gasses,
vapors, or flames?
When a house heater comes on, some lights get bright, Correct answer: bad neutral connection
others get dim. What could cause this?
What is the difference between a grounded conductor Correct answer: a grounded conductor is a circuit conductor that is intentionally
and a grounding conductor? 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 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!)
Question #: 1: When troubleshooting a motor capacitor, Correct answer: bad capacitor
the meter pegs to the right and stays there. What does Additional Notes: If the capacitor were good, the needle would peg to the right,
this indicate? then slowly drop back down.
Question #: 2: On a 480 V, three-phase blower motor with Correct answer: overloaded motor
auxiliary contacts and indicators, the push button start is
off due to a thermal overload. What is the most likely
cause?
When installing a fire alarm system bell or horn, how far 7'-6"
above grade should it be mounted? 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? 8'
When testing a GFCI trip, probe conductor and fixture inductive voltage tester
ground, use:
On a walk-through of a new home, the owner wants you would need to install 2 outlets
to install an outlet beside the stove. The counter top is
48" long and the wall is 6' away. The contractor
, What is the maximum allowed gap allowed around a box Correct answer: 1/8"
in a wall finished with drywall? 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 Correct answer: two; one from the emergency electrical system and the other
at each patient bed location? from the normal system
When can you have an isolated ground passing through a Correct answer: when you are reducing vibration and noise on the ground
panel without connecting it to that panel's equipment Additional Notes: When installing an isolated ground receptacle the insulated
grounding terminal bar? 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 Correct answer: the service pit is inadequately ventilated
to the bid amount on a job at an automotive repair shop? 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 inductor
balance the circuit?
Which of the following NEMA rating should be used for Correct answer: NEMA 3R
temporary construction power enclosures outside? 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- Correct answer: 103 amps
horsepower, three-phase squirrel-cage motor? 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 Correct answer: seal-off fitting
you use in order to prevent the passage of gasses,
vapors, or flames?
When a house heater comes on, some lights get bright, Correct answer: bad neutral connection
others get dim. What could cause this?
What is the difference between a grounded conductor Correct answer: a grounded conductor is a circuit conductor that is intentionally
and a grounding conductor? 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 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!)
