Midterm (6 And 11)

Question 1

OCPD

Answer 1

Over current protection device

Question 2

DMM

Answer 2

Digital multimeter

Question 3

NEMA

Answer 3

National electrical manufacturers association

Question 4

IEC

Answer 4

International electrotechnical commision

Question 5

ESD

Answer 5

Electrostatic discharge

Question 6

AWG

Answer 6

American wire gauge

Question 7

NEC

Answer 7

National electric code

Question 8

SPD

Answer 8

Surge protection device

Question 9

Best push button for emergencies

Answer 9

Jumbo mushroom

Question 10

Can a push button operate both NO and NC contacts

Answer 10

Yes

Question 11

Slow/fast selector switch is?

Answer 11

Two position

Question 12

Slow/off/fast selector switch is?

Answer 12

Three position

Question 13

X represents what condition of contacts?

Answer 13

Closed

Question 14

O represents what condition of contacts?

Answer 14

Open

Question 15

Advantage to using a joystick in applications

Answer 15

Being able to control many operations without taking your hands off the joystick and your eyes off the operations being performed

Question 16

Whats the dot in a joystick symbol

Answer 16

The position of joystick in which contacts will close

Question 17

If limit switch is drawn below contacts

Answer 17

NO/NO held closed

Question 18

If limit switch is drawn above contacts

Answer 18

NC/NC held open

Question 19

Limit switch that allows detection of moving object from any direction but head on

Answer 19

Wobble stick

Question 20

limit switch that allows the arm length to be adjusted

Answer 20

Lever arm

Question 21

Does the toe usually operate all 3 positions of a foot switch

Answer 21

No

Question 22

A foot peddle returns to the off position because it’s;

Answer 22

Spring loaded

Question 23

In. WC

Answer 23

Inches of water column

Question 24

If a pressure switch is used to maintain a pressure are NO or NC contacts used to control the compressor motor starter

Answer 24

NC

Question 25

If a temperature switch is used in a heating system to maintain a set temp are NO or NC contacts used to control trip the heating contractor

Answer 25

NC

Question 26

If a temp switch is used in a cooling system to maintain temp are NO or NC contacts used to control the air conditioning system

Answer 26

NO

Question 27

If a flow switch is used to sound an alarm when there’s no flow are NO or NC contacts used for the alarm

Answer 27

NC

Question 28

If a flow switch is used to detect flow in an automatic sprinkler system that has detected a fire and opened are NO or NC contacts used to control the alarm

Answer 28

NO

Question 29

If a level switch is used in a charging system are NO or NC contacts used to control the pump motor

Answer 29

NC

Question 30

If a level switch is used in a discharging system ate NO or NC contacts used to control the pump motor

Answer 30

NO

Question 31

Is a diode used in an AC or DC circuit

Answer 31

DC

Question 32

What position are most flow switches designed to operate in

Answer 32

Horizontal

Question 33

What are the two windings of a transformer

Answer 33

Primary and secondary

Question 34

If a transformer has a turns ratio of 1:4 what’s the voltage ratio

Answer 34

1 to 4

Question 35

If a transformer has a turns ratio of 1:4 what’s the current ratio

Answer 35

4 to 1

Question 36

If a transformer has a turns ratio of 1:4 what’s the power ratio

Answer 36

1 to 1

Question 37

If a transformer has a turns ratio of 1:4 and 115v is applied to the primary how many volts are on the secondary

Answer 37

460v (115 x 4)

Question 38

Why are iron cores laminated

Answer 38

To reduce eddy current losses which create heat

Question 39

What type of electrical service is most common for residential dwellings

Answer 39

Single phase 120VAC-240VAC

Question 40

What does x mean on a transformer

Answer 40

Low voltage

Question 41

What does a h mean on a transformer

Answer 41

High voltage

Question 42

When connecting the primary of a transformer to high voltage are the coils in series or parallel

Answer 42

Series

Question 43

When connecting the primary of a transformer to low voltage are the coils in series or parallel

Answer 43

Parallel

Question 44

Is a transformer rating based on the primary or secondary of the transformer

Answer 44

Secondary

Question 45

What info is needed to size a transformer

Answer 45

Input voltage available, output voltage desired, and output current required