Book #2

Question 1

The proper treatment for a person who has received a severe electrical shock but still breathing is to:

Answer 1

keep the victim lying down until competent help is available

Question 2

Two wire control using, for example, a thermostat is known as:

Answer 2

Low-voltage release

Question 3

Bringing a motor to a quick stop by phase reversal is called?

Answer 3

Plugging

Question 4

The principle difference between a contactor and a starter is:

Answer 4

The starter has overload relays

Question 5

What type of diagram includes all of the devices in the system and show their physical relationship to eachother

Answer 5

Wiring diagram

Question 6

What piece of equipment shall be used to prevent the inadvertent interconnection of normal and standby sources of supply?

Answer 6

Transfer switch

Question 7

A PN junction is a device known as?

Answer 7

Diode

Question 8

A rectifier is a device that changes?

Answer 8

AC to DC

Question 9

A half-wave rectifier produces a:

Answer 9

pulsating DC

Question 10

A thermistor is a type of resistor whose resistance is dependent on:

Answer 10

Temperature

Question 11

How does an open-on-rise thermostat work?

Answer 11

temp. rises, contacts open, turns off heating system

Question 12

What is generated when a thermocouple is generated?

Answer 12

Voltage

Question 13

The type of motor used by the small motor - driven tool industries is the:

Answer 13

Series Motor

Question 14

In universal motors, the armature and field coils are connected in?

Answer 14

Series

Question 15

For what purpose is a heat anticipator on a thermostat

Answer 15

anticipate temperature rises

Question 16

How does a triac dim an incandescent lamp?

Answer 16

Changing voltage across the lamp

Question 17

An auto-transformer may be used as:

Answer 17

A motor starter compensator

Question 18

The correct action to take if a motor trips out the thermal overloads is to:

Answer 18

Allow a cooling period then reset overloads

Question 19

An AC motor is required to have good variable speed qualities.

Answer 19

Wound rotor

Question 20

A megger is used for measuring what?

Answer 20

insulation resistance

Question 21

The centrifugal switch of a single phase capacitor-start induction-run motor is connected:

Answer 21

In series with the start winding

Question 22

What type of DC motor is used where extremally high torque is required and speed is not important

Answer 22

Series Motor

Question 23

The proper extinguisher to use on a class “C” fire is:

Answer 23

CO2

Question 24

Three wire motor control provides?

Answer 24

Low-voltage protection

Question 25

The range of a voltmeter may be extended by the use of a?

Answer 25

Multiplier in series

Question 26

An synchronous motor must be started

Answer 26

as an induction motor

Question 27

The power factor of a synchronous motor can be varied by changing the:

Answer 27

Field excitation

Question 28

Short-circuited coils in a stator are located efficiently by the use of a:

Answer 28

Growler

Question 29

The operating relationship of the blower fan in a gas furnace during normal heating operation is:

Answer 29

The fan comes on last and shuts off last