101 Basic Series - Module 05 - Post Assessment
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1
A circuit breaker that uses SF6 gas and is frequently used by European manufacturers employs the __________  method for arc extinguishing.
2
Peak value sensing in an analog trip unit never causes false tripping and offers more accuracy than digital trip units.
3
Circuit breakers are commonly used in loadcenters, panelboards, and switchboards.
4
The two steps in the two-step stored energy mechanism are charging the closing spring (storing the energy) and releasing energy to close the breaker.
5
Thermal magnetic trip units act to protect the circuit breaker itself.
6
Electromagnetic trip units are both temperature and harmonic insensitive.
7
As a circuit breaker opens or closes, the moveable contact maintains its position, while the fixed contact makes or breaks the circuit.
8
Circuit breakers are only used in loadcenters, panelboards, and switchboards. They are never to mounted in separate enclosures.
9
Circuit breaker frames are usually constructed of bolted and welded metal or molded insulating material.
10
In a thermal overload, temperature build-up occurs between the insulation and the conductor.
11
The key to a circuit breaker's short circuit interrupting capability is its ability to extinguish an arc quickly.
12
The two types of trip units are _______________ and ____________.
13
Digital trip units look at selected discrete points on a curve and make a summation of those points. This helps reduce false tripping.
14
The surge of amperage created during an electrical failing is called the __________.
15
Electromechanical trip units have increased accuracy, repeatability, and discrimination over electronic trip units.
16
A method for extinguishing arcs that moves the arc through an arc divider, splitting and cooling it is known as ____________.
17
Molded insulated frames are made from materials such as glass-polyester or thermoset composite resins.
18
he current transformer of an electronic trip unit is used in each phase to monitor and __________ the current to the proper input level.
19
A circuit breaker that is bolted in and hard wired to the frame is known to be _____________. Power must be turned off to remove and replace the breaker.
20
A trip unit is the circuit breaker's "intelligence", which trips the operating mechanism open in the event of an overcurrent condition.