MC II: Lesson 2 - More Electronics For Motor Control Devices

Question 1

The center material of a bipolar junction transistor is called a ? .

a.
base

b.
collector

c.
emitter

Answer 1

a. base

Question 2

Identify the correct name of the transistor symbol.

Answer 2

Question 3

A ? has three leads identified as base, collector, and emitter.

a. BJT

b. JFET

c. Triac

Answer 3

a. BJT

Question 4

Amplification and ? are the two main operating functions of the transistor.

a.
coordination

b.
protection

c.
switching

d.
transformation

Answer 4

c. switching

Question 5

For a BJT to operate as an amplifier, the base-emitter junction must be ? biased and the base-collector junction must be ? biased.

a.
forward / forward

b.
forward / reverse

c.
reverse / forward

d.
reverse / reverse

Answer 5

b. forward / reverse

Question 6

Transistor circuits are identified by the terminal that is common to the input and the output.
Select one:
True
False

Answer 6

true

Question 7

Identify the transistor circuit configurations with the correct name.

Answer 7

Question 8

When a transistor operates as a linear amplifier, it is operating in the ? region.

a.
active

b.
cutoff

c.
saturation

Answer 8

a. active

Question 9

When a transistor operates as a switch, it is in the ? region or ? region.

a.
active / cutoff

b.
active / saturation

c.
cutoff / saturation

Answer 9

c. cutoff / saturation

Question 10

When a transistor operates as a closed switch, it is in the ? region.

a.
active

b.
cutoff

c.
saturation

Answer 10

c. saturation

Question 11

When a transistor operates as an open switch, it is in the ? region.

a.
active

b.
cutoff

c.
saturation

Answer 11

b. cutoff

Question 12

The ? is controlled by current.

a.
BJT

b.
FET

c.
SCR

Answer 12

a. BJT

Question 13

The ? is controlled by voltage.

a.
BJT

b.
FET

c.
photodiode

Answer 13

b. FET

Question 14

? are well-suited for switching operations.

a.
JFETs

b.
Optocouplers

c.
Zeners

Answer 14

a. JFETs

Question 15

A ? has three leads, identified as drain, source, and gate.

a.
BJT

b.
JFET

c.
SCR

Answer 15

b. JFET

Question 16

The ? is a solid-state device that combines a photodiode and a transistor.

a.
optocoupler

b.
phototransistor

c.
SCR

Answer 16

b. phototransistor

Question 17

A(n) ? conducts current as a function of light intensity.

a.
optocoupler

b.
phototransistor

c.
SCR

Answer 17

b. phototransistor

Question 18

A(n) ? is used to provide a signal between two electrically isolated circuits.

a.
optocoupler

b.
phototransistor

c.
SCR

Answer 18

a. optocoupler

Question 19

A(n) ? has three leads, identified as anode, cathode, and gate.

a.
optocoupler

b.
phototransistor

c.
SCR

Answer 19

c. SCR

Question 20

The gate lead controls or triggers the SCR.
Select one:
True
False

Answer 20

true

Question 21

The SCR is a half-wave device.
Select one:
True
False

Answer 21

true

Question 22

When the gate pulse is removed from an SCR, the SCR will stop conducting.
Select one:
True
False

Answer 22

false

Question 23

The ? has three leads, identified as gate, main terminal 1, and main terminal 2.

a.
diac

b.
SCR

c.
triac

Answer 23

c. triac

Question 24

The triac is a half-wave device.
Select one:
True
False

Answer 24

false

Question 25

The diac has two terminals identified as ? and ? . a. A1 / A2 b. A+ / A- c. D1 / D2 d. D+ / D-

Answer 25

a. A1 / A2

Question 26

The diac acts like two ? diodes in series; therefore, it is primarily used as a triggering device for other semiconductors. a. photo b. SCR c. zener

Answer 26

c. zener

Question 27

Electronic devices should be removed from the circuit before they are tested. Select one: True False

Answer 27

true

Question 28

Field-testing semiconductor devices focuses on using a(n) ? to determine if PN junctions in the device are functioning properly. a. ammeter b. ohmmeter c. volt meter

Answer 28

b. ohmmeter

Question 29

To test semiconductor devices, one must understand the cause and effect of forward-biasing a PN junction and reverse-biasing a PN junction. Select one: True False

Answer 29

true

Question 30

A PN junction should exhibit a ? resistance when it is forward biased, and a ? resistance when it is reverse biased. a. high / high Incorrect b. high / low c. low / high d. low / low

Answer 30

c. low / high

Question 31

A diode that has a high resistance at both polarities is ? . a. open b. shorted

Answer 31

a. open

Question 32

A diode that has a low resistance at both polarities is ? . a. open b. shorted

Answer 32

b. shorted

Question 33

When testing an NPN transistor with an ohmmeter, what are the high or low resistance values expected for a good transistor?

Answer 33

Question 34

When testing a PNP transistor with an ohmmeter, what are the high or low resistance values expected for a good transistor?

Answer 34

Question 35

Transistors are faster and more reliable than mechanical relays. Select one: True False

Answer 35

true