NEC Master practice test Questions & Answers (RATED A+)
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Course
NEC Master
Institution
NEC Master
1 in figure - ANSWERpower connection
7 in figure - ANSWERend seal
A 30 degree kick has a hypotenuse of 10". Given that the cosecant of 30 degrees is 2, determine the side opposite or how far off the surface the end of the kick needs to be. - ANSWER5"
A 30-microfarad capacitor is in paralle...
NEC Master practice test Questions & Answers (RATED
A+)
1 in figure - ANSWERpower connection
7 in figure - ANSWERend seal
A 30 degree kick has a hypotenuse of 10". Given that the cosecant of 30 degrees is 2, determine the
side opposite or how far off the surface the end of the kick needs to be. - ANSWER5"
A 30-microfarad capacitor is in parallel with a 15-microfarad capacitor. The total capacitance is ___ -
ANSWER45
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance of these two
resistors? - ANSWER4 ohms
A buck-and-boost transformer has a primary current of 10A and the transformation ratio of 10:1.
What is the secondary current? - ANSWER100A
A cable hanger elbow is used to - ANSWERsuspend cables in long vertical runs
A carnival ride properly powered through a disconnect switch withing 6 feet of the operator can also
be opened from the operator's console using a - ANSWERshunt trip
A circuit diagram shows that the circuit divides into seperate branches and there are also series
loads. This is a ___ - ANSWERseries-parallel circuit
A circuit has a peak voltage of 275V. What is the average voltage value? - ANSWER175V
A circuit has a source voltage of 50V and a current of 10A. What is the power in watts? - ANSWER500
A clothing manufacturing plant would most likely be classified as ___. - ANSWERClass III
,A commercial kitchen with more than six pieces of kitchen equipment is subject to a demand factor
of ___ - ANSWER65%
A conductor with failed insulation contacts the metal edge of a grounded metal wireway. This is
known as a ____. - ANSWERground fault
A conduit run must pass over a pipe and then over a rectangular duct. This will require a total of
____ (bends). - ANSWERseven bends.
A conventional thermostat should not be thrown into the regular trash because it _____. -
ANSWERmay contain mercury
A correction factor must be applied if the ambient temperature is above ___ - ANSWER86 degrees
Fahrenheit
A current imbalance as low as 4 milliamps may be detected by a - ANSWERGFCI Sensor
A current-limiting circuit breaker performs in a manner similar to conventional thermomagnetic
circuit breakers at currents below a threshold of about - ANSWER1,000A
A cutaway view of a building or object is known as a - ANSWERsectional drawing
A delta-connected motor has ___ - ANSWER9 leads
A device that is used to step up generated voltage to make it suitable for commercial transmission is
called a - ANSWERpower transformer
A device that uses dissimilar metals to control electron flow is known as a - ANSWERthermocouple
A device that uses electromagnetic induction to transfer electrical energy from one circuit to another
is a ___ - ANSWERtransformer
A die used to - ANSWERcut the threads in conduit
,A digital device that sends fire alarm information over the public switched telephone network is
called a ____. - ANSWERDACT
A downed power line is most likely to result in a - ANSWERphase failure
A farm has 3 buildings with loads of 82A, 65A, and 15A. What is the total load? Assume that there
are no dwellings or motors. - ANSWER117 A
A feeder circuit with no motor load has a continuous load of 10A and a noncontinuous load of 10A.
The feeder overcurrent protective device should be sized at ____. - ANSWER22.5A
A feeder circuit with no motor load has a continuous load of 5A and a noncontinuous load of 5A. The
feeder overcurrent protective device should be sized at _____. - ANSWER11.25A
A feeder is used to connect - ANSWERthe main service panel and a subpanel
A fire alarm's secondary power can come from a battery or a ____. - ANSWERgenerator
A flange hanger is commonly used with a ____. - ANSWERsuspended fixture.
A freezestat is a - ANSWERnormally closed bimetal switch
A general-purpose NEMA enclosure is Type - ANSWER1
A GFCI sensor will trip when the - ANSWERcurrent in the neutral load is less than the current in the
hot load.
A good electrical connection should - ANSWERbe mechanically and electrically secure
A ground fault is best described as an unintentional - ANSWERelectrically conducting connection
between an ungrounded conductor of an electrical circuit and the normally non-current-carrying
conductors
, A ground test utilizing an auxiliary current electrode and an auxiliary potential electrode is known as
the - ANSWERthree-point test
A grounding electrode conductor - ANSWERmade of copper, aluminum, or copper-clad aluminum
A grounding wire may be which of the following? - ANSWERGreen
A knee in a leakage current-versus-voltage plot indicates a - ANSWERbreakdown current
A live-dead-live test is conducted in order to ___ - ANSWERverify that a circuit is de-energized
A medium-size motor has a frame number of 284T. The D dimension of this motor is ___ - ANSWER7"
A metric drawing scale of 1:100 typically depicts units in - ANSWERmillimeters
A mil is equal to - ANSWER.001 inch
A motor overload relay consists of a current-sensing unit and a mechanism activated by the sensing
unit that - ANSWERopens the motor circuit
A No. 1 isolated conductor must be identified using which of the following colors? - ANSWEROrange
A noncontinuous load of two 120V outlets for heavy-duty lamp holders would have a load of __ -
ANSWER1200VA
A pocket knife can be used to deburr - ANSWERPVC
A polyphase synchronous motor has three stator windings that are ___ - ANSWER120 degrees apart
A pulling line is usually made of - ANSWERnylon or other synthetic
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