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30 Cards in this Set
- Front
- Back
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While grounding prevent excessive voltage you need lightning or lie surges it does not stabilize voltage during normal operation true or false |
False |
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Which conductors are grounded on a single phased three wire 120/240 V system |
Neutral |
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The neutral conductor is always larger than the ungrounded conductor true or false |
False |
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Residential electrical service are grounded by connecting the ground conductors to a grounding electroad at the |
Service drop connection |
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Which of the following is a NEC violation when using as a grounding electrode |
Underground gas line |
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The maximum distance allowed by the nec to connect a grounded conductor to a water pipe after the pipe enters a building is |
Ten feet |
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Which is the following is use to Connect a grounding rod with a grounding conductor |
A grounding clamp |
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The conducting connection whether intentional or accidental between any of the conductors of an electrical system is known as a |
Short circuit |
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Only following are suitable materials for ground rods except |
Half inch solid aluminum rods |
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Which of the following copper AWG sizes should be used for the grounding conductor for a 200 app service using 3 / 0 copper conductors |
No.4 |
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When I metal water pipe is used as a grounding electrode what must be provided around the water meter |
Bonding jumper |
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When a common molded-case circuit breaker trips and what position will the operating handle be |
Half way between on and off position |
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What is the highest voltage rating 4 circuit breakers use on DC systems that UL recognizes |
600 v |
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Where is the amp rating normally marked on circuit breakers |
On the handle |
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Which of the following is the most important consideration when working on over current protection device |
The correct interrupting capacity |
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What is normally the highest short circuit current and residential application |
10000 A |
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Every circuit breaker must have its interrupting rating shown on the circuit breaker unless it is rated for |
5000 A |
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What must be used in conjunction with type S plug fuses when they are installed in a fuse holder |
A type S adapter |
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Unrenewable cartridge fuses what part of the fuse is normally renewed |
The barrel |
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Which of the following best describes a dual- element fuse |
I fuse having AO return limit and a time delay before activation |
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The function of a shading coil and a Contactor is to |
Prevent contact chatter and hum |
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What is the major difference between a contactor and a motor starter |
The starter provides overload protection while he contacted does not |
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Which of the following best describes a control Relay |
An electro magnetic device used in control circuits |
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Which is the following best describes a relay that is used for motor protection |
Thermal overload relay |
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The highest voltage rating form Magnetic relays is |
240v |
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The approximate inrush current of filament type lamps is how many times the normal operating current |
15 to 17 |
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What is a normal position of a stop push button that is used in conjunction with contactors |
Normally closed |
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The normal maximum amperage rating of a control relay at 600 V is |
15A |
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When selecting over low relays for motor which of the following must be considered |
The motor full load current |
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Where can PVC conduit be used |
Above and below ground |
