Study Guide Flashcards
(45 cards)
The setting for an overload relay is found to be insufficient to start a motor. The motor is a 230-volt, single phase 1/2 horsepower, continuous duty with a service factor of 1 and a temperature rise of 50 degrees centigrade (motor is automatically started). In order to use higher size overloads, they must be sized at ______ percent of the motor’s nameplate full-load current.
A. 115
B. 125
C. 130
D. 140
C. 130
430.32(G)
One 10 kW range, one 15 kW range, and one 24 kW range are to be installed in a multifamily dwelling. The total line feeder demand for these ranges is ______ VA.
A. 14,000
B. 17,000
C. 17,500
D. 24,000
C. 17,500
T 220.55
The line feeder demand for one 10 kW, single-phase electric range installed in a dwelling unit is ______ VA.
A. 8,000
B. 9,000
C. 11,000
D. 12,000
A. 8,000
T 220.55
An apartment complex has a 10 kW range in each of 48 units. The total line feeder demand for these ranges is ______ watts.
A. 36,000
B. 46,000
C. 61,000
D. 63,000
C. 61,000
T 220.55
What is the service neutral load (VA) for the electric ranges installed in a 6 unit, multifamily dwelling when the ranges are rated 9 kW, 9 kW, 10 kW, 11 kW, 12 kW, and 12 kW?
A. 12,400 VA
B. 14,700 VA
C. 15,400 VA
D. 16,100 VA
B. 14,700 VA
T 220.55
220.61
Where motor overload protection is external to the appliance, the appliance shall be required to be ______.
A. Approved
B. Identified
C. Listed
d. Marked
d. Marked
422.11(G)
A unit switch or switches with a marked “off” position that is part of an appliance and that disconnects all ____ conductors shall be permitted as the disconnecting means where other means for disconnection are provided.
A. Current carrying
B. Grounded
C. Grounding
D. Ungrounded
D. Ungrounded
422.34
Requirements for installing cord-and-plug connected built-in dishwashers and trash compactors state that the receptacle shall be located in the space occupied by the appliance, that the receptacle be accessible and that the cord shall be _____ long, measured from the face of the attachment plug to the plane of the rear of the appliance.
A. 2 to 3
B. 3 to 4
C. 3 to 5
D. 4 to 6
B. 3 to 4
422.16(B)(1)
What is the minimum size THHN copper branch-circuit conductors required to be installed to supply a 50 gallon water heater with a. Nameplate rating of 24 amperes?
A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG
B. 10 AWG
422.13
(120 gal or less is considered continuous)
The branch of circuit rating of a water heater (appliance) that is continuously loaded shall not be less than ______ percent of the marked rating.
A. 80
B. 125
C. 140
D. 175
B. 125
422.10(A)(3)
What size overcurrent protective device is required to protect an 80 gallon water heater whose nameplate ampacity rating is marked 28 amperes?
A. 20 ampere
B. 30 ampere
C. 35 ampere
D. 40 ampere
C. 35 ampere
Code Ref?
In other than fixed electric space-heating equipment, a(n) ______ shall supply central heating equipment.
A. Cord-and-plug attached branch circuit
B. Individual branch-circuit
C. Small appliance branch-circuit
D. Ungrounded branch-circuit
B. Individual branch-circuit
424.4(A)
Overcurrent protection for the branch-circuit supplying an electric furnace shall comply with the provisions of Section ______.
A. 210.20
B. 422.11
C. 426.52
D. 665.11
B. 422.11
One of the conditions which must be met for a room air conditioner to be considered a single motor unit requires the rating to be not more than ______ amperes and 250 volts, single-phase.
A. 30
B. 35
C. 40
D. 50
C. 40
440.62(A)(2)
Single-phase, cord-and-plug connected room air conditioners shall be provided with factory installed LCDI, HDCI, or ______ protection
A. AFCI
B. GFCI
C. IDCI
D. LIDI
A. AFCI
440.65
A(n) ______ is defined as operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating.
A. ground-fault
B. Overcurrrent
C. Overload
D. Short-circuit
C. Overload
100
A _____ fault condition represents a “solid” connection of relatively low or assumed “zero” impedance.
A. Arcing
B. Bolted
C. Grounding
D. Shorting
B. Bolted
OCPD ratings include all of the following EXCEPT ______.
A. Ampere
B. Impedence
C. Interrupting rating
D. Voltage
B. Impedence
The ampere rating of a fuse or a circuit breaker normally should not exceed the current carrying capacity of the ______.
A. Buildings
B. Conductors
C. Equipment
D. Panelboard
B. Conductors
The rating which defines the capacity of an OCPD to maintain its integrity when reacting to fault currents is referred to as its ______.
A. Continuous-ampere rating
B. Ground-fault rating
C. Interrupting rating
D. Voltage rating
C. Interrupting rating
The types of molded case circuit breakers include all of the following EXCEPT ______.
A. Electronic
B. Magnetic-only trips
C. Thermal magnetic
D. Thermal-only trips
D. Thermal-only trips
For a circuit breaker to trip, due to an overcurent, the ______ must sense the overcurrent and release (unlatch) the contacts.
A. Arc chutes
B. Release relay
C. Terminals
D. Trip unit
D. Trip unit
With electronic trip molded case circuit breakers, a ______ is used in each current phase to monitor and reduce the current to the proper input level required by the electronic trip unit.
A. Current transformer
B. Potentiometer
C. T-coil
D. Trip unit element
A. Current transformer
Under normal operation, when a fuse is operating at or near its ampere rating, it simply functions as a ______.
A. Appliance
B. Conductor
C. Heat sink
D. Load
B. Conductor
