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JATC Year 3: Motor Control - Mid Term > MC II: Lesson 2 - More Electronics For Motor Control Devices > Flashcards

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

1
Q

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

a.
base

b.
collector

c.
emitter

A

a. base

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2
Q

Identify the correct name of the transistor symbol.

A
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3
Q

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

a.
BJT

b.
JFET

c.
Triac

A

a. BJT

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4
Q

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

a.
coordination

b.
protection

c.
switching

d.
transformation

A

c. switching

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5
Q

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

A

b. forward / reverse

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6
Q

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

A

true

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7
Q

Identify the transistor circuit configurations with the correct name.

A
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8
Q

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

a.
active

b.
cutoff

c.
saturation

A

a. active

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9
Q

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

a.
active / cutoff

b.
active / saturation

c.
cutoff / saturation

A

c. cutoff / saturation

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10
Q

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

a.
active

b.
cutoff

c.
saturation

A

c. saturation

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11
Q

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

a.
active

b.
cutoff

c.
saturation

A

b. cutoff

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12
Q

The ? is controlled by current.

a.
BJT

b.
FET

c.
SCR

A

a. BJT

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13
Q

The ? is controlled by voltage.

a.
BJT

b.
FET

c.
photodiode

A

b. FET

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14
Q

? are well-suited for switching operations.

a.
JFETs

b.
Optocouplers

c.
Zeners

A

a. JFETs

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15
Q

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

a.
BJT

b.
JFET

c.
SCR

A

b. JFET

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16
Q

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

a.
optocoupler

b.
phototransistor

c.
SCR

A

b. phototransistor

17
Q

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

a.
optocoupler

b.
phototransistor

c.
SCR

A

b. phototransistor

18
Q

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

a.
optocoupler

b.
phototransistor

c.
SCR

A

a. optocoupler

19
Q

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

a.
optocoupler

b.
phototransistor

c.
SCR

A

c. SCR

20
Q

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

A

true

21
Q

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

A

true

22
Q

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

A

false

23
Q

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

a.
diac

b.
SCR

c.
triac

A

c. triac

24
Q

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

A

false

25
Q

The diac has two terminals identified as ? and ? .

a.
A1 / A2

b.
A+ / A-

c.
D1 / D2

d.
D+ / D-

A

a. A1 / A2

26
Q

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

A

c. zener

27
Q

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

A

true

28
Q

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

A

b. ohmmeter

29
Q

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

A

true

30
Q

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

A

c. low / high

31
Q

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

a.
open

b.
shorted

A

a. open

32
Q

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

a.
open

b.
shorted

A

b. shorted

33
Q

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

A
34
Q

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

A
35
Q

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

A

true

JATC Year 3: Motor Control - Mid Term (7 decks)

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