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WorksheetsFOR PREPARTION
Total questions: 45
Worksheet time: 23mins
A general term including material, fittings, devices, appliances, fixtures, apparatus, and the like used as part of, or in connection with, an electrical installation is __.
.premises wiring (system)
service equipment
utilization equipment
equipment
A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage, is a __ switch.
bypass isolation
general use
isolating
transfer
The permanent joining of metallic parts to form an electrically conductive path that will ensure electrical continuity and the capacity to conduct safely any current likely to be imposed is known as ___.
ordinary tap joint
scarf joint
britannia joint
bonding
A circuit breaker that has purposely introduced into a delay in the tripping action and which delay decreases as the magnitude of the current increases is a __ circuit breaker.
inverse time
adjustable
control vented
vented power
A switch intended for isolating an electric circuit from the source of power that thas no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means is a/an ___.
isolating switch
general-use switch
bypass isolation switch
transfer switch
Not readily accessible to persons unless special means for access are used is ___
elevated
guarded
isolated
listed
The definition of ampacity is
the current-carrying capacity of conductors expressed in volt-amps
the current-carrying capacity expressed in amperes
the current-carrying capacity of conductors expressed in wattage
the current in amperes a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
The definition of ambient temperature is
the temperature of the conductor
the insulation rating of the conductor
the temperature of the area surrounding the conductor
the maximum heat the insulation can be used within
Type of service where both the load and the time intervals may have wide variations.
Continuous
Periodic
Intermittent
Varying
Special permission is ___.
granted by the electrical foreman on the job
verbal permission by the inspector
given only once on one blueprint change request
the written consent of the authority having jurisdiction
An overcurrent protective device with a circuit opening fusible part that is heated and severed by passage of overcurrent through it is called ___.
current-limiter
fuse
circuit breaker
thermal overload
The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop is called ___
service drop
service-entrance
service equipment
none of these
A dwelling unit is ___.
one unit of an apartment
one or more rooms used by one or more persons
one or more rooms with space for eating, living and sleeping
one or more rooms used as a housekeeping unit and having permanent cooking and sanitation provisions
Where the conductor material is not specified in the Code, the conductors are assumed to be ___.
bus bars
aluminum
copper-clad aluminum
copper
Mandatory rules of the Code are identified by the use of the word ___.
should
shall
must
could
Advisory rules of the Code are identified by the use of the word ___
should
shall
must
could
. Continuous duty is ___.
a load where the maximum current is expected to continue for three hours or more
a load where the maximum current is expected to continue for one hour or more
intermittent operation in which the load conditions are regularly recurrent
operation at a substantially constant load for an indefinitely long time
An enclosure designed either for surface or flush mounting and provided with a frame, mat or trim in which a swinging door or doors are or may be hung is ___
cabinet
panelboard
cutout box
switchboard
All wiring must be installed so that when completed ___.
it meets the current-carrying requirements of the load
it is free of shorts and unintentional grounds
it is acceptable to the Code compliance authorities
it will withstand a hy-pot test
So constructed or protected that exposure to the weather will not interfere with successful operation defined the __
Weather proof
Weather tight
Weather resistant
All weather
. The current-carrying capacity of conductors expressed in amperes is ___.
demand
. pressure
ampacity
duty-cycle
Service raceways shall be equipped with a ___ service head at the point of connection to service drop conductors.
rain tight
weather proof
rain proof
watertight
A circuit breaker with a trip setting of not more than __ times the ampacity of conductor shall be considered as to provide the required short circuit protection.
3
4
5
6
Service conductors in cable shall NOT be smaller than ____
3.5 mm2
5.5 mm2
8.0 mm2
14.0 mm2
. Using aluminum or copper clad aluminum conductors, the minimum size of service entrance conductors shall be ____.
3.5 mm2
5.5 mm2
8.0 mm2
14.0 mm2
The lighting load for a dwelling unit expressed in terms of volt-ampere per sq. meter must be at least _______.
12
16
24
28
In dwelling units, at least one wall receptacle outlet shall be installed within _________mm of the outside edge basin or bath tub.
600 mm
900 mm
1200 mm
1600 mm
Power circuit breaker can be classified according to operation, some of these are, except
Inclined break
Horizontal break
Gravity open
Gravity close
Outlets for specific appliances such as laundry equipment, shall be within ___ of the appliance.
1800 mm
1200 mm
1600 mm
2200 mm
An insulated grounded conductor of 14mm2 or smaller shall be identified by a continuous _______ outer finish along its entire length.
green
black
green with yellow stripes
white or natural
The following are the standard ampere rating of a breaker which one is NOT?
40
45
50
55
A fuse or an overcurrent trip unit of a circuit breaker shall be connected in ________ with each ungrounded conductor.
Series
Parallel
Parallel
None of the above
. Enclosures for overcurrent devices shall be mounted in a ___ position unless in individual instances this is shown to be impracticable and is installed in accordance with 2.40.33 (PEC 2.40.33)
Horizontal
Diagonal
open
vertical
An overcurrent trip unit of a circuit breaker shall be connected in series with each___. (PEC 2.40.2.1)
Ungrounded conductor
Overcurrent Device
Grounded conductor
Transformer
Fuses and circuit breakers shall be located or ________ so that the persons will not be burned or otherwise injured by their operation. ( PEC 2.40.4.2 (a) )
Protected
Guarded
Shielded
None of the above
The neutral conductor shall not be _______. ( PEC 2.40.2.3)
stranded
solid
insulated
fused
What is the minimum size of grounding electrode copper conductor (PEC 2.50.3.17 )
3.5 sq.mm
5.5 sq.mm
8.0 sq.mm
14 sq.mm
The conductor with the highest insulation temperature rating is________. (PEC Table 3.10.1.13)
THWN
RH
RHH
THW
Concrete, brick or tile walls are considered as being. (PEC 3.0.1.6 b)
Isolated
Insulators.
Grounded
Dry Locations
Is it permissible to install direct current and alternating current conductors in the same outlet box. (PEC 3.0.1.3 c1)
Yes, if insulated for the maximum voltage of any conductor
No, never
Yes, if the ampacity is the same for booth conductors
Yes, in dry places
The neutral conductor _______. (PEC 3.10.1.15 b4 )
Is always the white grounded conductor
Has 70 % applied for a household clothes dryer for a branch circuit
Never apply ampacity corrections
Carries the unbalance current
Installing more than three current carrying conductors in the same conduit requires _______. ( PEC 3.10.15.b 2 a )
A larger conduit
High heat rated conductors
Derating Ampacity
Continuous loading
The Code rule for maximum 90- degree bends in a conduit between two boxes is four, the most likely reason for the total 360-degree limitation is (PEC 3.50.2.7)
It is unsafe
It makes pulling the conductors through the conduit too difficult
You can damaged the galvanized coating on the conduit
Too many bends require extra wire to be pulled
The total load on any overcurrent device located in a panelboard shall not exceed _____ of its rating where in normal operation the load will continue for 3 hours or more ( PEC 3.84.3.4(d) )
80%
125 %
.70%
50%
Two metals of different materials shall not be joined together in order to avoid the _______ action (PEC 3.46.1.3)
rusting
galvanic
reverse
corrosion
