Electrical

Question 1

What are the top connections called of a junction box?

Answer 1

Line lugs and they are hot all the time

Question 2

What is electromagnetism?

Answer 2

The interactive relationship between electric charge and magnetic flux

Question 3

What is permeability?

Answer 3

The ease at which a material can be magnetized by a solenoid is a measure of its permeability

Question 4

What is the best conductor?

Answer 4

Silver but it’s very expensive

Question 5

What are the 2 types of semiconductors?

Answer 5

N-type

P-type

Question 6

What is correct current?

Answer 6

The flow of free electrons in the conductor all flowing the same direction

Question 7

What is alternating current?

Answer 7

Current flowing in a circuit from a source of voltage that changes polarity (direction of current flow) continuously and regularly.

Question 8

What is single-phase?

Answer 8

A single voltage that creates a potential difference between only two conductors

Question 9

What is three-phase?

Answer 9

Three different voltages that interact to produce potential differences between the three conductors that supply the three-phase loads.

Question 10

What can voltage be compared to in electrical terms?

Answer 10

Pressure

Question 11

What is the symbol for volts in a mathematical equation?

Answer 11

E

Question 12

What can amps be compared to in a hydraulic system?

Answer 12

Flow

Question 13

What is the symbol for amps in a mathematical equation?

Answer 13

I

Question 14

How many watts is 1 hp?

Answer 14

746 watts

Question 15

What is the formula for calculating watts?

Answer 15

P = I x E

Question 16

What is a series circuit?

Answer 16

Current that flows through 2 lamps in tandem.

Question 17

What is a parallel circuit?

Answer 17

Current that flows through a divided path

Question 18

What is the formula for calculating voltage?

Answer 18

E = I x R

Question 19

What are 4 factors that affect resistance?

Answer 19

Materials

Cross-sectional area

Length of conductor

Temperature

Question 20

What is resistance compared to in a hydraulic circuit?

Answer 20

Flow restriction

Question 21

What is a capacitor compared to in hydraulics?

Answer 21

An accumulator

Question 22

What is the alternating current wave called?

Answer 22

A sine wave

Question 23

How far must you be when working near overhead power lines?

Answer 23

7m (22 feet)

Question 24

What are the tree types of circuit breakers?

Answer 24

Single-pole, single-phase

Three-phase auxiliary

Motor circuit breakers

Question 25

What position are the contacts in on a stop button?

Answer 25

Normally closed when depressed

Question 26

What is an electrical interlock?

Answer 26

They prevent electrical equipment from operating out of sequence

Question 27

What are the two distinct types of fuses?

Answer 27

Fast acting

Time delay

Question 28

How must you check amperage with a multimeter?

Answer 28

Between 2 points of a circuit that are normally connected to one another

Question 29

What is a must-requirement for testing with an ohmmeter

Answer 29

All power to the circuit must be off

Question 30

What is a megohmmetor used for?

Answer 30

For testing insulation of motor windings or other wiring installations

Question 31

In a 120V AC single-phase, two-wire supply circuit. What colours are the wires?

Answer 31

Black is hot

White is neutral

Natural copper/green is ground

Question 32

In a 120/240 volt AC, single phase, three-wire supply circuit. What colours are the wires?

Answer 32

Hot wire 1 is black

Hot wire 2 is red

Neutral is white

Ground is natural copper/green

Question 33

For smaller wire, the ________ the gauge number, the _______ the wire

Answer 33

For smaller wire, the HIGHER the gauge number, the SMALLER the wire