101 Basic Series - Module 09 - CEU Education
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1
An ________ is an electrical fault characterized by low and erratic current that might ignite combustible material.
Overcurrent fault
Ground fault
Erratic fault
Arc fault
2
On a plug-in breaker, the line-side terminal is a _________ that clips onto a bus stab in a loadcenter or panelboard.
Extending tang
Clamp
Terminal lug
3
Hydraulic Magnetic Supplementary Protectors are a good choice for rooftop and railcar applications.
True
False
4
What is the main mounting method for residential circuit breakers:
Plug-in
Bolt-on
Cable-in/Cable-out
All of the above
None of the above
5
In a miniature circuit breaker, the voltage rating can be lower than the circuit voltage, but never higher.
True
False
6
Supplementary protectors are available in current ratings from 0.1- 63 amps.
True
False
7
Single-pole residential circuit breakers are available at 120V and 240V.
True
False
8
Supplementary protectors provide overcurrent protection and can serve as the only source of protection per UL.
True
False
9
Supplementary protectors are usually used to protect a particular device rather than a branch circuit.
True
False
10
The ______ is the brain of the miniature circuit breaker.
Frame
Operating mechanism
Bimetal
Arc extinguisher
11
The internal construction of a Current Limiting Supplementary Protector includes: visual contact position indicator window, three-position handle (on, off, tripped), Snap-on mounting clip, and interphase insulation barriers.
True
False
12
Miniature circuit breakers fall into two categories.
Residential and utility
Utility and industrial
High voltage and residential
Residential and industrial
13
A _____________ has a solenoid device and trips the breaker at a range 35 - 70 of the rated coil voltage.
Shunt trip
Ground fault circuit interrupter
Undervoltage release
None of the above
14
The maximum amount of volts that a miniature circuit breaker can handle is called its ________.
Ampere rating
Ampere interrupting capacity
Voltage rating
Let-through rating
15
The component of the circuit breaker whose function is to provide the means of opening and closing the circuit is the ________.
Frame
Operating mechanism
Trip unit
Arc extinguisher
16
A Ground Fault Circuit Interrupter:
Detects ground currents
Trips to protect both people and equipment
Has a solid state trip unit
All of the above
None of the above
17
Since gravity has an effect on the oil, the mounting position is critical with ________ Supplementary Protectors.
Electromagnetic
Electro limiting
Hydraulic mangetic
Current limiting
18
Miniature circuit breakers are used to switch and protect the lowest common distribution voltage in an electrical system.
True
False
19
A __________ provides remote-controlled tripping of a miniature circuit breaker in case of an emergency.
Shunt trip
Ground fault circuit interrupter
Undervoltage release
None of the above
20
The amount of current that a miniature circuit breaker can continuously carry is called its _____.
Ampere rating
Ampere interrupting capacity
Voltage rating
Let-through rating
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