WorksheetsMASTER CLOSEBOOK EXAM #4
Total questions: 41
Worksheet time: 21mins
The National Electrical Code is sponsored by the______.
Underwritten Lab
National safety Council
National Electrical Manufacturers Association
National Fire Protection Association
A drawing showing the floor arrangement of a building is referred to as a (an) _______.
perspective
isometric
surface G.B
plan
Readily accessible is________.
requiring a 6 foot ladder
requiring to move only small obstacles
within 50 feet
capable of being reached quickly for operation
A fitting is________.
part of wiring system that is intended primary to perform an electrical function
pulling cable into a proper for
to suitable or proper for
part of a wiring system that is intended primarily to perform a mechanical function.
The neutral conductor________.
is always the “white” grounded conductor
carries the balanced current
Note 8 never applies
carries the unbalanced current
An oil switch is a switch having contacts which operate under______ .
I. askarel II. oil III. Other suitable liquids
I only
II only
I and II only
I, II or III
Which of the following is an ammeter?
I only
II only
III only
I, II or III
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 Code compliance authorities
it will withstand a hy-pot test
If you installing a fluorescent fixture in a customer’s home and noise emitted by the ballast were an important consideration, which one of the following sound rating would you select to give the quietest operation?
Type A
Type D
Type F
Type AB
60 cycles frequency travels 180 degrees in how many seconds?
11/60
1/120
1/180
1/30
A wattmeter indicates______.
I. real power II. apparent power if PF is not unity III. power factor
I only
II only
III only
I, II and III
Of the following, improving the commutation of a DC generator is most often done by means of _____.
a compensator
interpoles
an equalizer
a series rheostat in series with the equalizer
Code requirements may be waived ______.
by the Fire department
by the utility company
by the authority having jurisdiction
under no circumstances
Ampacity is______.
the current-carrying capacity of conductors expressed in volt-amp
the current-carrying capacity expressed in amperes.
the current-carrying capacity of conductors expressed in amperes.
the current in amperes a conductor can carry continuously under the condition of use without exceeding its temperature rating.
An electric circuit that controls another circuit through a relay is a_____ circuit.
a remote-control
pilot
low-energy power
transfer
The horse power rating of a motor______.
is a measure of motor efficiency
is the input to the motor
cannot be changed in watts
is the output of the motor
What is the function of a neon glow tester?
I. Determines the circuit is alive
II. Determines the polarity of DC circuits
III. Determines if circuit is AC or DC current
I only
II only
III only
I, II and III
Power in a three phase system may be measured with a minimum of______.
one wattmeter
two voltmeters
two ammeters
none of these
What are Optical Fiber Cables used for?
I. transmit light for control II. signaling III. Communication
I only
II only
III only
I, II and III
What Chapter in the Code is power limited circuits referred to?
CHAPTER 5
CHAPTER 6
CHAPTER 7
CHAPTER 8
Something that would affect the ampacity of a conductor would be_______.
voltage
amperage
Length
Temperature
An electric bell outfit would be used to check for_______.
voltage
ampacity
continuity
current
An ammeter is connected______.
in series with the load
in parallel with the load
both in series and in parallel with the load
neither in series nor parallel with the load
The Code requires all circuits to have at least ______and the adequate grounding.
an undergrounded wire and a grounding wire
two hot wires and a grounding wire
at least two wires
a hot wire and a grounding wire
Which of the following is not permitted for connecting conductors#6 and larger to terminal parts?
solder lugs
pressure connectors
splices to flexible leads
wire binding screws
_____are used to provide explanatory materials, references to other sections, precautious to be observed, and further mandatory requirements.
Mandatory rules
Exceptions
Fine print notes
Listings
Accessible (as applied to wiring methods) is _____.
I. not permanently closed in by the structure of finish of the building.
II. capable of being removed or exposed without damaging the building structure or finish
I only
II only
both I and II
neither I or II
A transformer would most likely have a_____ efficiency.
60%
70%
80%
90%
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.
The definition of dustproof is _____.
an electrical enclosure with sealing gaskets to prevent the equipment from overheating from an accumulation of dust.
constructed so that dust will not enter the enclosing case under specified test conditions.
protected so that dust will not interfere with its successful operation.
a housing that seals dust from contacting energized parts
It is generally not good practice to supply lights and motors from the same circuit because _____.
lamps for satisfactory service must operate within closer voltage limits than motors.
overloads and short circuits are more common on motor circuits.
when motors are started, the large starting current causes a voltage drop on the circuit and the lights will blink or burn dim.
all of these
Covered, shielded, fenced or enclosed by means of suitable covers, casings, barriers, rails, screens, mats, or platforms is the definition of _____.
guarded
protected
isolated
enclosed
The overhead service conductors from the last pole or the other aerial support to and including the splices, if any, connecting to the service entrance conductors at the building or other structures is the _____.
service load
service lateral
service drop
service supply
Without live parts exposed to a person on the operating side of the equipment is called _____.
dead front
isolatedexternally operable
externally operable
interrupted
Frequency is not a problem in most electrical work because it ______.
never affects the circuit wires
varies directly with voltage
is a constant value
only concerns DC
If the voltage is doubled, the ampacity of a conductor is ______.
increases
decreases
doubles
remains the same
To calculate the power used by an appliance (not motor driven) one needs to know _____.
I. voltage and current II. current and resistance III. Voltage and resistance
I only
II only
III only
I, II or III
Fixture wire shall not be smaller than #_____.
16
18
20
22
A toaster will produce less heat on low voltage because_____.
its total watt output decreases
the current increases
the resistance has changeits total watt output increases
its total watt output increases
Electrical equipment shall be installed_____.
better than the minimum Code allows
according to the local Code when more stringent than the N.E.C
according to the N.E.C regardless of the local Code
according to the local Code when less stringent than the N.E.C
What is the applied voltage of this circuit?
144 volts
120 volts
784 volts
336 volts
