Rural Electrification Flashcards
(105 cards)
For motors with a marked service factor not less than 1.15, the multiplying factor to be used in determining for size of overload protection shall be ____.
a. 110 % c. 120 %
b. 115 % d. 125 %
d. 125 %
For a motor starter to be in sight of the controlled motor, it must NOT be more than ___ meters away.
a. 20 c. 25
b. 10 d. 15
d. 15
Flexible metallic tubing smaller than
___ electrical trade size shall NOT be used in wiring.
a. 20 mm c. 12 mm
b. 15 mm d. 32 mm
b. 15 mm
Consist of a group of wire twisted to form a metallic string.
a. Duplex wire c. solid wire
b. loomex wire d. stranded wire
d. stranded wire
Transformers that are installed in unsupervised locations and rated over 600 V are protected by fuses on the primary side and cannot exceed ____ percent of the primary full load current.
a. 150 c. 200
b. 300 d. 250
b. 300
Ratio of the maximum demand of a system or part of a system to the total connected load of a system or
the part of the system under consideration.
a. power factor
b. utilization factor
c. capacity factor
d. demand factor
d. demand factor
Type NM (non-metallic sheathed cable) shall be permitted for ____ work in normally dry locations.
a. exposed c. both a and b
b. concealed d. neither a nor b
c. both a and b
Conductors used only for grounding shall be _____.
a. green, green with yellow stripes, or yellow
b. green, yellow with green stripes, or bare
c. green, green with yellow stripes, or bare
d. green, yellow, or bare
c. green, green with yellow stripes, or bare
The lowest standard size of disconnect
is ____.
a. 20 A c. 30 A
b. 60 A d. 15 A
c. 30 A
Branch circuit conductors supplying a single motor shall have an ampacity NOT less than ____ percent of the motor full load current rating.
a. 115 c. 120
b. 125 d. 130
b. 125
Where the overload relay selected using the factor 125 % is not sufficient to start the motor or carry the load, the multiplying factor shall be increased but shall NOT exceed ____ percent.
a. 130 c. 140
b. 150 d. 160
c. 140
An exposed wiring support system using a messenger wire to support insulated conductors.
a. Metal clad cable wiring
b. Concealed knob and tube wiring
c. Messenger cable wiring
d. Messenger supported wiring
d. Messenger supported wiring
In replacing a busted fuse, which of the following is important?
a. same size and type
b. same type but different rating
c. same size but different rating
d. different size and type
a. same size and type
Which of the following wires has 75 ohm impedance?
a. Foam-filled twin lead
b. Flat twin lead
c. Coaxial
d. none of these
c. Coaxial
Consists of three or more flat copper conductor placed edge to edge separated and enclosed within an insulating assembly.
a. Armored cable
b. Sheathed cable
c. Flat cable assemblies
d. Flat conductor cable
d. Flat conductor cable
Rigid metal conduit shall be shipped in standard lengths of ___.
a. 3,000 mm c. 6,000 mm
b. 4,000 mm d. 5,000 mm
a. 3,000 mm
The term given to an insulated stranded wire.
a. Durability c. Cord
b. Pendant d. Receptacle
c. Cord
In which method of starting a motor is the starting current a minimum?
a. star-delta
b. direct on line
c. resistance starter
d. autotransformer
a. star-delta
Which of the following sizes of fuse is NOT standard?
a. 80 A c. 60 A
b. 125 A d. 75 A
d. 75 A
The smallest electrical trade size of
intermediate metal conduit.
a. 15 mm c. 20 mm
b. 12 mm d. 25 mm
a. 15 mm
The Philippine Electrical Code (PEC) is intended for ____ application by
government bodies exercising legal
jurisdiction over electrical installation.
a. advisory c. mandatory
b. optional d. all of these
c. mandatory
Before starting any installation work, alteration, repair or extension on any electrical system, what type of permit is needed?
a. Building permit
b. Electrical permit
c. Working permit
d. Mayor’s permit
b. Electrical permit
This type of cable is a fabricated assembly of insulated conductors enclosed in a flexible metal sheath.
a. Ground wire
b. Medium voltage cable
c. Messenger Wire
d. Armored cable
d. Armored cable
Which of the following electrical
conductor has the highest resistance?
a. 3.5 mm2
b. 2.0 mm2
c. 5.5 mm2
d. 20 mm2
b. 2.0 mm2