Deck 13: Electronic Control Devices

Question 1

Electronic controls used in the heating, air-conditioning, and refrigeration industry are built as one component.

Answer 1

True

Question 2

Electronic overload modules use thermistors to sense the temperature of the motor winding.

Answer 2

True

Question 3

Vacuum and gas-filled tubes are large and bulky and made of many delicate parts.

Answer 3

True

Question 4

Equipment used in the industry is usually powered by alternating current in the voltage range of 220 to 480 volts.

Question 5

If N-type material is sandwiched between two P-type materials, the transistor is referred to as a(n) ____________________ transistor.

Question 6

Some of the materials used as semiconductors have a resistance almost halfway between that of glass (____________________) and copper (conductor).

Question 7

When alternating current is used, there are often voltage spikes due to power surges, circuit characteristics, or lightning.

Question 8

What is a triac?

Question 9

What is a light-emitting diode (LED)?

Question 10

NPN and PNP type transistors are constructed of three parts: the base, the emitter, and the____________________.

Question 11

Originally, electronic devices were constructed using copper wire.

Question 12

Sensors and nonlinear devices are accurate only within a specified range.

Question 13

If P-type material is sandwiched between two N-type materials, the transistor is referred to as a(n) ____________________ transistor.

Question 14

Heat is the main enemy of an electric motor.

Question 15

What is the function of an anti-short-cycling timer?

Question 16

_____________________ refers to the electrical conductivity of the materials used in solid-state components.

Question 17

Electronic control circuits generally are direct current circuits with their own power supply, usually an AC to AC diode rectifier.

Question 18

Most gas furnaces that have been installed from the past 10 years to current installations use an electronic control board, usually called a(n) ____________________ module, which supervises the operation of the entire gas furnace.

Question 19

Define voltage spike.

Question 20

The ____________________ is a combination of two semiconductor devices: the thermistor and the varistor.