NCCER 1-4 Electrical Practice Exam Questions with
Correct Answers.
A program that requires trainees to demonstrate the ability to perform job related
tasks is known as an - answer Competency Based
An electrical apprentice training program typically requires ______ total hours of OJT
- answer 8,000
The standard that covers arc fault protection is - answer NFPA 70E
The primary mission of OSHA is to - answer Ensure that the employer maintains a
safe workplace.
If you see an unsafe condition on a job site you should - answer report it to a
supervisor.
Which of the following is a correct statement about an employee's responsibilities -
answer when you have been given a responsibility, you should do it without waiting
to be told.
Special enclosures are used in hazardous locations to safely contain. - answer
Arcing
Industrial maintenance electricians should be able to disassemble and reassemble -
answer Magnetic Motor Starters
An apprenticeship program approved by the DOL office of apprenticeship requires
____ of classroom training per year. - answer 144 hours
The standard that sets the minimum requirements for the safe installation of
electrical systems is - answer The NEC
High voltage rubber gloves must be electrically tested - answer Every 6 months
The major cause of death from electrical shock is - answer Fibrillation of the heart
The main factor that determines the outcome of an electrical shock is the - answer
Amount of current
According to OSHA portable tools and appliances do not need to be grounded... -
answer if they have an approved system of double insulation
All electrical equipment and lines should be considered ____ until determined
otherwise - answer Energized
When a barrier is used as a controlled access zone, it must be _____ from the edge
- answer 6 feet
,Batteries can be an explosion hazard because - answer Hydrogen mixed with air is
explosive in the proper concentration
Before entering a confined space you must - answer be trained in confined space
entry procedures
Portable electric hand tools account for a large number of electrical shock injuries.
One way to prevent these types of accidents is by - answer Proper grounding of
tools
When using a straight ladder, the side rails should extend at least _____ inches
above the top support point - answer 36"
A _______ is intended for the electrical protection of personnel - answer GFCI
What voltage is considered high voltage - answer 600v or more?
_______ Rubber gloves are rated for applications up to 1,000v - answer Class 0
The first step to be completed before working on a circuit is to, - answer Check that
the circuit is tagged and locked out
The OSHA standards for the construction industry are covered in CFR..... - answer
CFR 1910 & 1926
After a hazard review is completed, __________ determine(s) the classification of a
confined space as a no permit or permit- required confined space - answer the
supervisor and project/safety managers
Specific data for a hazardous material is found in? - answer the MSDS
Which of the following is a true statement - answer you must be evaluated by a
physician, fitted, and thoroughly instructed in the use of respiratory protective
devices if you are required to use them
Rubber gloves can be damaged by - answer Hand creams
When working on de energized circuit that have capacitors installed the first thing
that a qualified individual should do is to - answer Short out all parts of the circuit
with a shorting probe
A voltage of one volt applied across a resistance of one ohm produces a current of
one amp. If the voltage is doubled and the resistance is halved, then the current
_____. - answer Increases four times
A battery produces voltage using - answer chemical action
The force that causes electrons to flow is most commonly called - answer voltage
,According to ohms law the amount of current in a circuit is equal to the - answer
voltage divided by the resistance
If a circuit has 10 amps of current and 12 ohms of resistance the applied voltage is, -
answer 120v
Which of the following is considered a good conductor of electricity - answer Copper
If the voltage source of a circuit supplies 240 volts and the resistance measures 5
ohms, the current in the circuit is _____ amps - answer 48 amps
The power distribution component used to raise and lower voltage is the - answer
Transformer
Which of the following values is measured by placing a meter in series with a load -
answer Current
If the resistance of a circuit is 100 ohms and the current is 5 amps the power is
_____ watts - answer 2,500 watts
If a circuit has a source voltage of 120v and a current of 10a, the power is ____
watts - answer 1,200 Watts
If the voltage source of a circuit is 120v and the resistance measures 2 ohms, the
current in the circuit is _____ amps - answer 60 amps
If the current in a circuit is 30 amps and the resistance is 8 ohms, the applied voltage
is ______ volts - answer 240 volts
If the voltage source of a circuit supplies 240v and the resistance is 20 ohms the
current _____ amps - answer 12 amps
If a circuit has an applied voltage of 480v and a current of 20 amps, the resistance is
_____ ohms - answer 24 ohms
The total resistance of four resistors in parallel with values of 3,5,20 and 50 ohms is -
answer 1.66 ohms
The total resistance of three resistors in parallel with values of 5, 20 and 50 ohms is -
answer 3.7 ohms
A circuit with a voltage of 120 volts across five resistors in parallel, 5,14,21,25 and
100 ohms has a total current of _____ amps - answer 44.3 Amps
The total resistance of three resistors in parallel with values of 5, 7.5, and 15 ohms is
_____ ohms - answer 2.5 ohms
Given a current with a source of 100 volts connected across four parallel 100-ohm
resistors, the current through each resistor is _____ amp - answer 1 amp
, The total current that will flow through three resistors in parallel 40, 90, and 75 ohms
that are connected across a 100-volt source is ____ amps - answer 4.95 amps
Two resistances of 28 and 25 ohms are connected in parallel. In series with this
combination is a 38-ohm resistance and in parallel with this combination is a 24-ohm
resistance. Given a voltage of 1, 23 volts the total current flowing through the circuit
is ______ milliamps - answer 75 Ma
Which of the following best defines a parallel circuit - answer each load is connected
in a separate current path of the circuit
In figure 1 the total resistance of the circuit is ____ ohms (100 v source, 15,25,5,5
ohms) - answer 24.17 ohms
In figure 1 ____ amps of current would flow through the circuit ( 100v source,
15,25,5,5 ohms) - answer 4.14 amps
According to Kirchhoff's voltage law, the total voltage drop in a circuit is equal too the
- answer Voltage power source
A light bulb uses 12 watts of power when placed acorss a 12-v battery. Its resistance
is ____ ohms - answer 12
In figure 1 What is the voltage drop across the parallel resistors - answer 17.3 volts
In figure 2, the apporximate total resistance of the circuit is _____ ohms (120v
source , 15,5,20,10) - answer 29 ohms
In figure 2, if r3 was removed from the circuit ___ amps of current would flow through
the circuit
(120v source, 15,5,10) - answer 4 amps
The main purpose of the NEC is to - answer Specify the minimum provisions
necessary for protecting people and property from electrical hazards
The organization that sponsors the NEC today is the - answer National Fire
Protection Association
Mandatory Rules are - answer Rules containing the words shall or shall not that
electrician must below
Permissive rules are - answer Rules that identify actions that are allowed but not
required, such as optional or alternative methods
NEC Article 90 - answer An introduction to the NEC that provides an overview of the
book
NEC article 100 - answer Definitions used in the NEC
NEC Chapter 9 contains - answer Tables
