Ch. 10 * (Power Distribution)

Question 1

Matching waveforms

Answer 1

“In phase”

Question 2

Ohm’s law

Answer 2

V = IR

Question 3

V =

Answer 3

Voltage in volts

Question 4

I =

Answer 4

Current in amperes

Question 5

R =

Answer 5

Resistance in ohms

Question 6

Inductive reactance

Answer 6

Magnetic field

Question 7

Capacitive reactance

Answer 7

Electric field

Question 8

Voltage and current in phase

Answer 8

Resistive load

Question 9

Current lags voltage

Answer 9

Inductive circuit

Question 10

Current leads voltage

Answer 10

Capacitive load

Question 11

Power bill =

Answer 11

$99

Question 12

Watt-Hours

Answer 12

Watts X 24 hours X 365 days

Question 13

1 Watt = ___ BTU/hour

Answer 13

3.413

Question 14

AWG sizing system has become generally accepted ___

Answer 14

Worldwide

Question 15

AWG sizes represent ___

Answer 15

Number of steps involved in wire drawing process

Question 16

AWG size range

Answer 16

36 - 4/0

Question 17

Conductor sizes larger than 4/0

Answer 17

Circular Mils

Question 18

Solid-state equipment generally cause ___

Answer 18

Harmonics

Question 19

Swell

Answer 19

Increase

Question 20

Lag

Answer 20

Decrease

Question 21

The N in N+1 = ___

Answer 21

Need

Question 22

Voltage regulators adjust ___

Answer 22

Line voltage

Question 23

Rectifier

Answer 23

Battery charger

Question 24

Types of battery cells

Answer 24

Except “zinc oxide”

Question 25

Battery room considerations

Answer 25

Avoid direct sunlight
Avoid heating/cooling
Near eyewash facility

Question 26

Battery clearance

Answer 26

3.28’

Question 27

Optimal battery temperature

Answer 27

77°

Question 28

Cell of choice for communications

Answer 28

Lead-calcium

Question 29

Most common alkaline cell

Answer 29

NiCd

Question 30

Cells can be connected in parallel up to ___ times

Answer 30

5

Question 31

Batteries (def.)

Answer 31

Store energy and chemical form

Question 32

Aluminum and copper

Answer 32

Don’t mix

Question 33

Low voltage disconnect (LVD)

Answer 33

Disconnects battery

Question 34

Nominal voltage for telcom in the U.S.

Answer 34

-48v

Question 35

Motor generator

Answer 35

Utility

Question 36

Engine generator

Answer 36

Fuel powered

Question 37

Harmonic filter

Answer 37

Reduces voltage

Question 38

Voltage regulator

Answer 38

Adjust voltage

Question 39

Best ‘K’ rating for data center

Answer 39

K-20

Question 40

K rating =

Answer 40

Transformer’s ability to dissipate heat

Question 41

What causes harmonics

Answer 41

Solid-state equipment

Question 42

Transients surge

Answer 42

Rapid increase

Question 43

Increase in voltage

Answer 43

Swell

Question 44

Decrease in voltage

Answer 44

Sag

Question 45

Horsepower =

Answer 45

Unit of measure for mechanical power

Question 46

12,000 BTU

Answer 46

1 ton of air conditioning

Question 47

Ohm’s law formula applies to ___

Answer 47

Direct Current (DC)

Question 48

Distribution system

Answer 48

Delivery of electricity from utility to customer

Question 49

With DC power, a ___ drop is allowable

Answer 49

1 V

Question 50

Available voltages depend on ___

Answer 50

Type of transformer

Question 51

Shielded isolation transformers

Answer 51

20%

Question 52

It is ___ that voice and data equipment utilize Isolated Grounds

Answer 52

Not recommended

Question 53

Output of backup UPS supplies bypass circuit to primary UPS

Answer 53

Isolated redundant

Question 54

Formula to calculate power in W

Answer 54

Not VR

Not I/R squared

Question 55

Difference between real power (in watts) and apparent power (in volt-amperes)

Answer 55

Inductance and capacitance

Question 56

Conducted coupling affects

Answer 56

Output/input signal lines and utility/premises electrical power distribution

Question 57

Electric shock can cause ___

Answer 57

Injury and death