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Electrical Science > Ch 5 & 6 > Flashcards

Ch 5 & 6 Flashcards

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1
Q

Coil of a transformer energized from AC source.

A

Primary Winding

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2
Q

What causes an expanding and collapsing field in the core?

A

AC voltage applied to primary windings

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3
Q

The expanding and collapsing magnetic field induces voltage in what?

A

Secondary windings wrapped around the core

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4
Q

The output from the secondary windings is the same frequency as what? And goes where?

A

Primary windings. Load.

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5
Q

Transferring energy to an electrically isolated circuit.

A

Mutual Inductance

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6
Q

Coil that delivers AC to the load.

A

Secondary Winding

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7
Q

When voltage is increased, Current is?

A

Decreased and vice versa

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8
Q

Inductor produces self induced EMF that opposes applied voltage.

A

CEMF

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9
Q

Functions of Transformers?

A

Step up step down AC voltages

Provide isolation between source and load.

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10
Q

Primary distribution that connects load breakers to power source.

A

Electrical Bus

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11
Q

Device that consumes electrical power.

A

Electrical load

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12
Q

Electrical component that is essential to operation of a system that performs a vital function.

A

Vital/Essential Load

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13
Q

Centralized distribution and control point for 480 vac loads.

A

Motor Control Center

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14
Q

What helps prevent accidents to personnel?

A

Equipment Grounding

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15
Q

Reduces voltage and functions as centralized pt for distribution of power.

A

Substation

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16
Q

Transforms high voltage power to a level that can be used by loads in the system.

A

Distribution Transformer

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17
Q

Removal of any part of a power system that suffers an electrical fault by energizing the trip circuit.

A

Protective Relays

18
Q

Protects component from overcurrent.

A

Fuse

19
Q

3 Purposes of Circuit Breakers

A

Maintenance isolation

Open circuit for protection and provide normal switching without damaging circuit.

Starter for large motors

20
Q

Low voltage breaker components

A 
Operating mechanism 
Main contacts/arching contacts 
Arc extinguisher
Tripping mechanism 
Terminal connectors
21
Q

Breaker positions

A

Racked in
Racked out
Test

22
Q

Breaker Indicators

A

Circuit breaker positioning indicating lights

Circuit breaker positioning indicating flag

23
Q

Breaker Safety Features

A 
Rack in out / test positions 
Arc extinguisher 
Automatic trip 
Trip free operating mechanism 
Quick make quick break 
Open/closed tripping indicators
24
Q

Control and protect the operation of a motor.

A

Motor Controllers

25
Q

Deenergize motor during low voltage condition and prevent it from starting automatically upon restoration.

A

LVP Controller

26
Q

Deenergize motor during low voltage condition and restarts motor upon restoration.

A

LVR Controller

27
Q

Maintains motor across the line at all times.

A

LVRE Controller

28
Q

3 features of manual controllers for small loads

A

Small size

Automatic restart upon power restoration

Low cost

29
Q

Magnetic controller protective devices

A

Low voltage

Over current or overload

30
Q

What proves overload protection?

A

Manual controllers

31
Q

Two position switches used for isolation of power to loads.

A

Disconnect Switches

32
Q

Automatically transfers essential loads from normal power source to an alternate power source when normal power lost.

A

Automatic Transfer Switches

33
Q

Designed to prefer one power source over any other.

A

Normal seeking transfer switch

34
Q

This switch does not make the distinction between power sources.

A

Power seeking transfer switches

35
Q

480 v distribution system indications

A
  1. Transformer Voltmeter - voltage on the line.
  2. Transformer Ammeter - Current output of transformer.
  3. Transformer demand watt-hour - displays highest output power.
  4. Switchgear bus voltmeter - voltage on switch gear bus bar.
36
Q

Small distribution panels that provide power at either 120 v or 208 v.

A

Panel Board

37
Q

Electrical problems such as overloads, short circuits and open circuits.

A

Electrical Fault

38
Q

Assembly of circuit breakers that are electrically connected to a system of buses.

A

Switchgear

39
Q

Power from the normal source, 115 kv at site.

A

Normal Power

40
Q

Furnished power to all vital/essential loads.

A

SDG Power

41
Q

Conducting connection between a circuit and the earth. Human body can serve as the earth and complete connection.

A

Ground

42
Q

Protective Relays

A 
Differential relay
Over voltage relay 
Under voltage relay 
Thermal overload relay 
Instantaneous OC relay 
Instantaneous ground OC relay

Electrical Science (5 decks)

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