AS108-3 Review-1

Question 1

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

Answer 1

Rectifier

Question 2

What are the two most common materials used as the base material in semiconductor components?

Answer 2

Silicon and germanium

Question 3

What is the polarity of a diode’s anode?

Answer 3

Positive

Question 4

What is the polarity of a diode’s cathode?

Answer 4

Negative

Question 5

What polarities should a diode be connected to in a circuit in order for the diode to conduct electrical current?

Answer 5

Anode- Forward Biased Cathode-Reversed Biased

Question 6

What is it called when a diode is connected into an electrical circuit so it will conduct current?

Answer 6

Forward Bias

Question 7

What polarities should a diode be connected to in a circuit in order for the diode to block electrical current?

Answer 7

Anode- Reversed
Cathode- Forward

Question 8

What is it called when a diode is connected into an electrical circuit so it will block current?

Answer 8

Reverse Bias

Question 9

What is another name for a diode?

Question 10

If you connect the red lead of an ohmmeter to the anode of a diode and the black lead to the cathode, what should the meter read?

Answer 10

Diodes High Resistance

Question 11

If you connect the red lead of an ohmmeter to the cathode of a diode and the black lead to the anode, what should the meter read?

Answer 11

OL

Question 12

What is the problem with the diode if the ohmmeter reads very low or zero resistance in both directions?

Answer 12

Partial Short

Question 13

What is the problem with the diode if the ohmmeter reads very high or infinite resistance in both directions?

Answer 13

Open circuit

Question 14

What are zener diodes most often used for in electronic circuits?

Answer 14

Voltage Regulator

Question 15

What is special about an LED that is NOT true about other diodes?

Answer 15

It is the only Diode to emit Light

Question 16

Name the diode type shown below AND label the anode and cathode.

Answer 16

Type: Zener

Question 17

Name the diode type shown below AND label the anode and cathode.

Answer 17

Type: LED

Question 18

Name the diode type shown below AND label the anode and cathode.

Question 19

Name the transistor shown AND label the leads.

Answer 19

Type: PNP

Question 20

Name the transistor shown AND label the leads.

Answer 20

Type: NPN

Question 21

What polarities should an NPN transistor be connected to in a circuit in order for the transistor to allow electrical current from emitter to collector?

Answer 21

Base- Positive
Emitter- Negative

Question 22

What polarities should an PNP transistor be connected to in a circuit in order for the transistor to allow electrical current from emitter to collector?

Answer 22

Base- Negative
Emitter- Positive

Question 23

What is the problem with a transistor if an ohmmeter reads very high resistance between the collector and emitter even when the proper polarities are connected between base and emitter?

Question 24

What is the problem with a transistor if an ohmmeter reads very low resistance between the collector and emitter regardless of what polarities are connected to the base and emitter?

Question 25

What point in the circuit is considered to be a zero voltage reference?

Answer 25

Ground

Question 26

What type of circuit fault is characterized by a break in the circuit?

Answer 26

Open Circuit

Question 27

What type of circuit fault is characterized by current bypassing all or some of the electrical load in the circuit

Answer 27

Short

Question 28

What type of circuit fault is characterized by there being a voltage drop where there should not be a voltage drop?

Answer 28

Added Resistance

Question 29

If there is system voltage across two points and there are no other voltage drops in the circuit, what type of fault does that indicate?

Answer 29

Partial Short

Question 30

If a voltmeter is placed across a light in a circuit, what should the voltmeter indicate if the power switch is open?

Answer 30

Zero

Question 31

If a voltmeter is placed across a switch and it reads 0 volts, what position is the switch in?

Answer 31

Switch is Open/Off

Question 32

If a voltmeter is placed across a circuit breaker or fuse and it reads 0 volts, what is the condition of the circuit breaker/fuse

Answer 32

Good

Question 33

If a voltmeter is placed across a circuit breaker or fuse and it reads system voltage, what is the condition on the circuit breaker/fuse?

Answer 33

Bad

Question 34

If a voltmeter is placed across a switch and it reads system voltage, what position is the switch in?

Answer 34

Closed/On

Question 35

If an ohmmeter is places across a light bulb and it is isolated from the rest of the circuit, what will the ohmmeter indicate?

Answer 35

Resistance of the Bulb

Question 36

Identify the following components:

Answer 36

36. Light Bulb 37.Master Switch 38. _____________ 39.Fuse 40. Relay 41. Circuit Breaker

Question 37

42 Name the logic gate symbol shown and complete the logic chart.

Answer 37

AND

Question 38

43 Name the logic gate symbol shown and complete the logic chart.

Answer 38

OR

Question 39

44 Name the logic gate symbol shown and complete the logic chart.

Answer 39

XOR

Question 40

45 Name the logic gate symbol shown and complete the logic chart.

Answer 40

NAND

Question 41

46. Name the logic gate symbol shown and complete the logic chart.

Answer 41

NOR

Question 42

47. Name the logic gate symbol shown and complete the logic chart.

Answer 42

XNOR