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Exam 12: Electronic Control Devices

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Question 1

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

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Question 2

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

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B) False

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Question 3

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

Originally, electronic devices were constructed using copper wire.

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

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

What is a light-emitting diode (LED)?

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

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

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

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

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

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

Heat is the main enemy of an electric motor.

Define voltage spike.

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.

What is a triac?

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

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

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