Basic Electricity

Question 1

Amperage is a measure of

Answer 1

electron flow

Question 2

Voltage is the measure of

Answer 2

electrical pressure

Question 3

Wattage is a measure of

Answer 3

electrical power

Question 4

746 watts equals

Answer 4

1 horsepower

Question 5

One kilowatt is equal to

Answer 5

3412 Btus

Question 6

The unit of measurement for magnetic flux is?

Answer 6

maxwell

Question 7

On a resistive electrical circuit which law would be used to calculate I, E or R?

Answer 7

Ohm’s

Question 8

Which of the following formula would be used to calculate amperage in resistive circuit?

Answer 8

I=RE

Question 9

Capacitance represents a components ability to

Answer 9

store electrons

Question 10

A meter with the capacity to measure very high resistances is call a?

Answer 10

megger

Question 11

A technician would use a micron gauge to measure?

Answer 11

deep vacuum

Question 12

If a technician has set his VOM meter to R x 100 he would be measuring

Answer 12

resistance

Question 13

When checking resistance through a motor winding the proper instruments to use would be a/an?

Answer 13

ohmmeter

Question 14

An ohmmeter will measure infinite resistance when testing an

Answer 14

open fuse or closed contacts

Question 15

If a technician has placed his VOM in parallel with an energized load he is probably checking?

Answer 15

voltage

Question 16

When a technician is checking unknown _______ he should always set the instrument to the highest scale to prevent damage to the meter.

Answer 16

voltage & amperage

Question 17

If a technician has placed his VOM in series with the load he is probably checking?

Answer 17

amperage

Question 18

Which of the following instruments would be used to check the condition of insulation on a motors windings?

Answer 18

megohmmeter

Question 19

A ladder diagram can also be called

Answer 19

electrical line wiring diagram

Question 20

A pictorial diagram will?

Answer 20

show approximate location of electrical system components

Question 21

The primary and secondary windings in a transformer are wired in?

Answer 21

not connected electrically

Question 22

What happens when the length of the path of an electrical circuit is decreased?

Answer 22

there will be a decrease in total circuit resistance

Question 23

What is the total amperage of a circuit when two 25 ohm resistors are connected in series using a 120 volt power source?

Answer 23

2.4 amps

Question 24

If the voltage is the same across each load in a circuit it would be considered?

Answer 24

parallel circuit

Question 25

If a circuit is designed to allow the flow of electrons to follow only one path it would be?

Answer 25

rectifier circuit

Question 26

A line or ladder type diagram is most useful for?

Answer 26

understanding circuit operation

Question 27

If a technician took a reading across a normally closed set of contacts when a relay or contactor coil was de-energized the reading would be?

Answer 27

0 volts

Question 28

An ohmmeter must never be connected to a

Answer 28

energized circuit

Question 29

If a 24 volt control transformer has a VA rating of 60 what is the maximum amperage rating?

Answer 29

2.5 amp

Question 30

A technician has obtained the following resistance readings across the terminals on a single phase compressor: 8 ohms from T1 to T3, 3 ohms
from T1 to T2, and 5 ohms from T2 to T3. Which terminals are RUN, START, and COMMON?

Answer 30

T1 is Run
T2 is Common
T3 is Start

Question 31

The contacts of a current relay

Answer 31

are normally open contacts

Question 32

A motor starter is also called a?

Answer 32

motor controller

Question 33

If a relay coil is open the technician would read ______ when checking if with his ohmmeter

Answer 33

infinite resistance or zero resistance

Question 34

A sensor that uses a positive temperature coefficient thermistor (PTCT)

Answer 34

increases resistance as temperature increases

Question 35

These devices are used to protect electrical circuits from overcurrent

Answer 35

fuses and breakers

Question 36

If two 30 µf run capacitors are wired in parallel what is the new microfarad rating on the circuit?

Answer 36

60 µf

Question 37

On a hermetic compressor what component is designed into the compressor to protect against excessive temperatures and overcurrent

Answer 37

an overload protector

Question 38

The contacts of a potential relay

Answer 38

are normally closed

Question 39

A rectifier is used to?

Answer 39

convert alternating current to direct current