CB 5 Flashcards
Something that would effect the ampacity of a conductor would be
voltage
amperage
length
temperature
temperature
Alternating currents may be increased or decreased by means of a
motor
transformer
dynamo
megger
transformer
Fixtures supported by the framing members of suspended seiling systems shall be securely fastened to the ceiling framing memever by mechanical means such as
bolts or screws
rivets
clips identified for use
any
Which has the highest electrical resistance?
brass
iron
water
paper
paper
Conductor sizes are expressed
only in CMA
in AWG or CMA
in diameter or area
in AWG or millimeters
In AWG or CMA
Of the following, which is not a type of file?
half round
bastard
tubular
mill
tubular
Oil is used in many large transformers to?
prevent breakdown due to friction
lubricate the core
cool and insulate the xfer
lubricate teh coils
cool and insulate the xfer
Fractional horsepower universal motors have brushes usually made of?
copper strands
mica
carbon
thin wire rings
carbon
When administering first aid to a worker suffering from fright as a result of falling from a ladder, the most important thing to do is?
position the person to a sitting position
cover the person and keep them warm
apply artificial respiration immediately
check the rungs of the ladder
cover the person and keep them warm
If a coworker is burned by acid from a storage battery, the proper first aid treatment is to wash with?
iodine and leave it open to the air
vinegar and apply a wet dressing
water and apply vasoline
Iye and apply dry bandage
water and apply vasoline
A type of motor that will not operate on DC is the?
series
short shunt
long shunt compound
squirrel cage
squirrel cage
Receptacles installed on what ampere branch ckts shall be of the grounding type?
15 and 20
25
30
40
15 and 20
Where conductors carrying alternating current are installed in metal enclosures or metal raceways, they shall be so arranges as to avoid heating the surrounding metal by induction, to accomplish this what/which shall be grouped together?
all phase conductors
where used, the neutral
all equipment grounding conductors
all
A (an) changes AC to DC?
battery
capacitor
alternator
rectifier
rectifier
A steel measuring tape is undesirable for use around electrical equipment. The least important reason is the what?
danger of entaglement in rotating machines
shock hazard
short circuit hazard
magnetic effect
magnetic effect
What is the ability of a material to permit the flow of eclectrons?
voltage
current
resistance
conductance
conductance
Which of the following two wires are the grounded wires in a 3 wire cable?
red and white
white and black
bare and red
white and bare
white and bare
A fitting is what?
part of a wiring system that is intended primarily to perform an elecrical function
pulling cable into a confined area
to be suitable or proper for
part of a wiring system that is intended primarily to perform a mechanical function
mechanical function