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39 Cards in this Set
- Front
- Back
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When using copper conductors it is always necessary to wrap the conductors around the screw? |
False |
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When splicing a copper conductor to an aluminum conductor outdoors with an uninsulated connector: |
The copper must be placed below the aluminum conductor |
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What section in the CEC is service and grounding requirements |
6 |
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Arc flash is an electrical current that passes through the air between two ungrounded conductors or between ungrounded and grounded conductors that produces high temperature. T or F |
T |
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Arc flash hazard analysis is what? |
Determines risk of personal injury |
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Flash protection boundary |
Approach limit from live parts where the person could get 2nd degree burns |
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Working distance in terms of electrical safety is what |
Sum of distance from person to cabinet to live parts. |
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What is incident energy measured in? |
J/cm2 or cal/cm2 @ the working distance |
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What is arc duration? |
Total time it takes for the breaker to detect and shut off circuit |
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How many boundaries are there for shock protection? Describe them. |
3....limited. restricted. Prohibited. And for the prohibited boundary you need a written approved plan for the work they will perform |
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How many hazard/risk categories are there? |
0-4 |
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What are three factors that determine the severity of an arc flash injury |
Proximity. Temperature. Time it takes circuit to break |
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Basic compliance to CSA Z462 requirement is established with a five step process for safety and operability. |
True |
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The arc flash protection boundary is described as the distance a worker is exposed to ______cal\cm2 of incident energy |
1.2 calcm2 |
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Whats the emergency action to take in case of electrical shock? |
Remove victim. Prevent further injury. Send for help. Eliminate danger. Report accident |
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At what mA does become difficult to breath? |
15-20mA |
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When working under overhead power lines a safe distance of _____must be maintained. Until voltage is verified. |
7 meters |
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Describe pitch and set of a saw blade |
Set of a blade is the amount of teeth turned to one side or another from the center of blade Pitch is number of teeth per inch |
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A three wire cord is necessary to safely ground all electric drills? |
False if its foublebinsulated it does not need a ground |
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What is the symbol for electric charge? |
Q |
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What is the unit of measure of charge and symbol? |
Coulombs C |
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Static electricity is the build up of charge in an insulated object |
T |
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What are 6 methods for producing electromotive force? |
Magnetic, chemical, friction, heat, pressure, light |
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What are four states of matter |
Solid. Liquid. Gas. Plasma. |
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Name two properties of matter |
Chemical and physical |
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Define matter |
Anything that has mass and occupies space |
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Two important characteristics of a parallel circuit for resistance what are they? |
When resistance is added in parallel the total resistance decreases. Total resistance is always smaller than the smallest resistor |
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A proportion is______ |
Two equal ratios |
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Orthographic projections are two dimensional and isometric drawings are 3 |
T |
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Terminal voltage of a cell or battery decreases as load current is increased |
T |
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Static electricity can be defined as buildup of charge on a non insulated object |
F |
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3 resistors are connected in parallel across a 100 V source. Of one resistor is removed what happens to the current in the remaining two resistors? |
Stay the same |
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Symbol used to represent electrical power is? |
P |
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A 120\240 volt system supplies a split receptacle which feeds a 500w tv and a 5 w lamp. If the neutral opens what would occur? |
Lamp would fail due to excessively high voltage |
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The magnitude of voltage created in a thermocouple is dependant on what? |
Temperature difference between junctions |
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Nicad batteries when compared to lead acid have a longer storage life. T F |
T |
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A resistor is constructed of a carbon based allow formed into a cylindrical shape then given a protective coating of ceramic or silicone. What type of resistor is this? |
Composition |
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Control devices are always connected in... |
In series with loads |
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A supervised circuit will have no current flowing through the relay coil when the load is energized. t f |
T |
