C10 TExam #1 Question with verified answers
Question #: 1: When troubleshooting a motor capacitor, the meter pegs to the
right and stays there. What does this indicate? - √√Correct 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 answer: overloaded motor
When installing a fire alarm system bell or horn, how far above grade should it be
mounted? - √√7'-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? - √√8'
When testing a GFCI trip, probe conductor and fixture ground, use: - √√inductive
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 - √√would need to install 2 outlets
What is the maximum allowed gap allowed around a box in a wall finished with
drywall? - √√Correct 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 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
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 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? -
√√inductor
Which of the following NEMA rating should be used for temporary construction
power enclosures outside? - √√Correct 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 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 answer: seal-off
fitting
When a house heater comes on, some lights get bright, others get dim. What
could cause this? - √√Correct answer: bad neutral connection
What is the difference between a grounded conductor and a grounding
conductor? - √√Correct 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 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, the meter pegs to the
right and stays there. What does this indicate? - √√Correct 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 answer: overloaded motor
When installing a fire alarm system bell or horn, how far above grade should it be
mounted? - √√7'-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? - √√8'
When testing a GFCI trip, probe conductor and fixture ground, use: - √√inductive
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 - √√would need to install 2 outlets
What is the maximum allowed gap allowed around a box in a wall finished with
drywall? - √√Correct 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 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
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 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? -
√√inductor
Which of the following NEMA rating should be used for temporary construction
power enclosures outside? - √√Correct 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 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 answer: seal-off
fitting
When a house heater comes on, some lights get bright, others get dim. What
could cause this? - √√Correct answer: bad neutral connection
What is the difference between a grounded conductor and a grounding
conductor? - √√Correct 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 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!)
