Solid State Electronics

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Question 1

What meter must never be used when testing a circuit board?

A	An ammeter
B	A voltmeter
C	An ohmmeter
D	An oscilloscope

Question 2

What is the purpose of a diode?

A	It converts direct current into alternating current
B	It is used to increase the resistance of an electrical circuit
C	It stores electrons in an electrical circuit
D	. It allows current to flow in one direction

Question 3

Which component is commonly used as a solid state relay?

A	A transistor
B	A thermistor
C	A diode
D	A cathode

Question 4

What solid state component decreases its resistance as its temperature increases?

A	A cathode
B	An anode
C	A PTC thermistor
D	A NTC thermistor

Question 5

Which component is used to store electrons in an electrical circuit?

A	A capacitor
B	A thermistor
C	A diode
D	A transistor

Question 6

Which component is primarily used to drop voltage in an electrical circuit?

A	A diode
B	A resistor
C	A rectifier
D	A transistor

Question 7

What component is used to convert alternating current to direct current?

A	A capacitor
B	A transistor
C	A rectifier
D	A thermistor

Question 8

What component blocks DC and passes AC?

A	A cathode
B	An anode
C	A rectifier
D	A capacitor

Question 9

To determine the correct operating sequence for a system with electronic controls, you should _____.

A	make sure that there is voltage present at each outlet terminal
B	read the manufacturer's literature
C	study the black box on the schematic diagram
D	trace the circuit from the loads back to the sources

Question 10

Each of the following is a common external cause of microprocessor control failures, except _____.

A	voltage surges from thermistors
B	static electricity
C	excessive heat
D	RFI

Question 11

Before a microprocessor sends a signal to initiate combustion in a heating system, it will first _____.

A	energize the gas valve relay
B	adjust the blower off delay
C	activate the high-voltage ignition transformer
D	verify that each safety control is in its correct position

Question 12

When you suspect that a microprocessor control board has failed, the best thing to do is _____.

A	immediately replace the board
B	call the factory representative
C	swap the suspected board with a known good board
D	check the applicable inputs and outputs of the board to verify that the fault is on the board

Question 13

Standardization of electronic controls means that in the future _____.

A	a product line made by a particular manufacturer will use the same control board or module
B	no matter what type of failure occurs, it can be corrected by replacing the control board or module
C	all manufacturers will use the same controls
D	all the systems that use a particular control board or module will operate in exactly the same way

Question 14

Which of the following preventive maintenance procedures is recommended for electronic control boards?

A	Run a diagnostic test once a year, even if no faults are indicated.
B	Replace them once a year.
C	Leave them alone.
D	Periodically expose them to RFI and high temperatures to see if they will fail.

Question 15

What equipment is normally used for troubleshooting microprocessor controls?

A	Ammeter
B	VOM
C	Ohmmeter
D	Logic analyzer

Question 16

Each of the following is true of microprocessor controls, except that they _____.

A	stand up well to rough handling
B	enable control features not feasible with conventional controls
C	are easier to troubleshoot than conventional controls
D	provide greater accuracy than conventional controls

Question 17

Each of the following control features would be found on a furnace with conventional controls, except _____.

A	a gas control that automatically shuts off if the burner flame goes out
B	a sensor that verifies gas ignition
C	automatic adjustment of the blower-off delay to prevent nuisance trips
D	a two-speed blower

Question 18

Which of the following is a harmonic of 60Hz?

A	200Hz
B	150Hz
C	90Hz
D	120Hz

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Solid State Electronics

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