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Motor Control 200 > Chapter 28 > Flashcards

Chapter 28 Flashcards

1
Q

The function of a substation includes __________.

A

receiving voltage and increasing it to an appropriate level

providing a safe point for disconnecting power

providing a place to adjust and regulate outgoing voltage

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2
Q

A(n) __________ is an overcurrent protection device with a link that melts and opens the circuit on an overcurrent condition.

A

fuse

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3
Q

A(n) __________ connection is made when the three ends of separate phases are connected together, creating a common wire.

A

wye

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4
Q

A(n) ___________ connection is made when one end of each coil is connected together and the other end of each coil is let open for external connections.

A

delta

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5
Q

A(n) __________ is a metal-enclosed distribution system of busbars available in prefabricated sections.

A

busway

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6
Q

A(n) __________ diagram uses single lines and symbols to show flow path, voltage values, disconnects, overcurrent protection devices, transformers, and panelboards in a circuit.

A

one-line

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7
Q

All transformer installations must follow __________ and NFPA requirements.

A

National Electrical Code (NEC)

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8
Q

The voltage regulator on a transformer has __________ to allow for a variable output.

A

taps

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9
Q

NEC Section 450.21 (B) states that all dry-type transformers over 112 1/2 kVA rating shall be installed in a __________ rooms.

A

fire-resistant

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10
Q

Switchboards are designed for use as __________, distribution, or a combination of both.

A

service-entrance

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11
Q

Panelboards contain overcurrent protection devices for lighting, appliance, and __________ circuits.

A

power distribution branch

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12
Q

A(n) __________ is an OCPD with a mechanical mechanism that may manually or automatically open the circuit when an overload condition or short circuit occurs.

A

circuit breaker

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13
Q

The two basic types of busways are feeder and __________ busways.

A

plug-in

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14
Q

__________ is the process of delivering electrical power where it is needed.

A

Power Distribution

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15
Q

Switchboards that have more than __________ switches or circuit breakers must include a main switch to protect or disconnect all circuits.

A

six

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16
Q

An enclosure should be tested for __________ if voltage is present and at the correct level.

A

grounding

17
Q

To meter the incoming power, a switchboard must have a(n) __________ to measure power usage.

A

watt-hour meter

18
Q

The capacity of transformers is rated in __________.

A

Kva or Va

19
Q

The three main sections of a substation are the primary switchgear, transformer, and __________ sections.

A

secondary switchgear

20
Q

Switchboards are rated by the manufacturer for maximum voltage and __________ output.

A

current

21
Q

A(n) __________ circuit is the portion of a distribution system between the final overcurrent protection device and the outlet or load connected to it.

A

branch

22
Q

A(n) __________ electrode is a conductor embedded in the earth to provide a good ground.

A

grounding

23
Q

__________ perform the same function as fuses and are tested the same way.

A

Circuit breaker

24
Q

NEC Article 408.15 states that not more than ___________ overcurrent devices for a lighting and appliance panelboard, other than mains, are permitted in one cabinet.

A

42

25
Q

A(n) ___________ is the piece of equipment which a large block of electric power is delivered to from a substation and broken down into smaller blocks for distribution throughout a building.

A

switchboards

26
Q

A(n) __________ is a wall-mounted distribution cabinet containing a group of overcurrent and short-circuit protection devices for lighting, appliance, or power distribution branch circuit.

A

panelboard

27
Q

Fuses can be checked using a(n) ___________ placed across a fuse that has been removed from a circuit.

A

continuity tester

28
Q

A(n) __________ receives incoming power and delivers it to the control circuit and motor loads.

A

motor control center

29
Q

A(n) __________ is a device that protects transformers and other electrical equipment from voltage surges caused by lightning.

A

lighting arrester

30
Q

In a transformer, a marking of X1 or X2 indicates the __________ voltage side.

A

low

Motor Control 200 (10 decks)

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