EVITP Electrical 3 Test 5 Questions and
Answers 100% Correct
Types of fault current include overloads, short circuits, ground faults, and -
ANSWER arc faults
Overcurrent protection is covered in - ANSWER NEC Article 240
One of the first signs of worn motor bearings is most likely to be a(n) -
ANSWER Continuous overloads
Equipment intended to interrupt current at fault levels must have an interrupting
rating at nominal circuit voltage that is ____ - ANSWER equal to the current
available at the line terminals of the equipment
For 480V circuits, the arc current seldom exceeds _____. - ANSWER 60% of the
available bolted fault current
A conductor with failed insulation contacts the metal edge of a grounded metal
wire way. This is known as a - ANSWER Ground fault
The voltage rating of a fuse - ANSWER can be higher than the circuit voltage
but never lower
The type of fuse used to prevent nuisance tripping from temporary motor
overloads and surge currents is a - ANSWER Dual element time delay fuse
, UL Class R fuses have a short circuit interrupting rating of up to ____. -
ANSWER 200,000A
Which of the following is within the basic scope of Underwriters Laboratories -
ANSWER safety
A device that is designed to withstand numerous trip and reset cycles without
replacement and can be thermal, magnetic, or solid-state is an - ANSWER
Overload relays
Which of the following is true with regard to circuit breakers - ANSWER Under
normal conditions, the current flow bypasses the spring and latching mechanism.
500A circuit breaker has a frame size of - ANSWER 1000A
What is the frame size of a 30A circuit breaker - ANSWER 100A
Circuit breakers are classified by - ANSWER the largest ampere rating of its
range
Which of the following is true with regard to circuit breaker interrupting capacity
ratings - ANSWER UL tests now include NEMA ratings
If a 120V feeder for nonmotor loads feeds a continuous load rated at 20A and a
noncontinuous load at 25A, what size overcurrent protective device should be
selected? - ANSWER 50A
Answers 100% Correct
Types of fault current include overloads, short circuits, ground faults, and -
ANSWER arc faults
Overcurrent protection is covered in - ANSWER NEC Article 240
One of the first signs of worn motor bearings is most likely to be a(n) -
ANSWER Continuous overloads
Equipment intended to interrupt current at fault levels must have an interrupting
rating at nominal circuit voltage that is ____ - ANSWER equal to the current
available at the line terminals of the equipment
For 480V circuits, the arc current seldom exceeds _____. - ANSWER 60% of the
available bolted fault current
A conductor with failed insulation contacts the metal edge of a grounded metal
wire way. This is known as a - ANSWER Ground fault
The voltage rating of a fuse - ANSWER can be higher than the circuit voltage
but never lower
The type of fuse used to prevent nuisance tripping from temporary motor
overloads and surge currents is a - ANSWER Dual element time delay fuse
, UL Class R fuses have a short circuit interrupting rating of up to ____. -
ANSWER 200,000A
Which of the following is within the basic scope of Underwriters Laboratories -
ANSWER safety
A device that is designed to withstand numerous trip and reset cycles without
replacement and can be thermal, magnetic, or solid-state is an - ANSWER
Overload relays
Which of the following is true with regard to circuit breakers - ANSWER Under
normal conditions, the current flow bypasses the spring and latching mechanism.
500A circuit breaker has a frame size of - ANSWER 1000A
What is the frame size of a 30A circuit breaker - ANSWER 100A
Circuit breakers are classified by - ANSWER the largest ampere rating of its
range
Which of the following is true with regard to circuit breaker interrupting capacity
ratings - ANSWER UL tests now include NEMA ratings
If a 120V feeder for nonmotor loads feeds a continuous load rated at 20A and a
noncontinuous load at 25A, what size overcurrent protective device should be
selected? - ANSWER 50A
