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JATC Year 3: Motor Control - Mid Term > Midterm Questions > Flashcards

Midterm Questions Flashcards

1
Q
A
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2
Q

The maximum reverse bias voltage a diode can withstand is known as ? voltage.

a. barrier
b. breakdown
c. depletion region
d. peak inverse

A

d. peak inverse

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3
Q

Since diodes conduct current flow in only one direction, they are commonly used to convert an AC voltage to a(n) ? DC voltage.

a. barrier
b. breakdown.
c. excitation
d. pulsating

A

d. pulsating

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4
Q

? is the process of converting an AC voltage to a DC voltage.

a. Alternation
b. Conversion
c. Doping
d. Rectification

A

d.
Rectification

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5
Q

In a zener diode, the reverse breakdown voltage is referred to as ? voltage.

a. barrier
b. breakover
c. peak inverse
d. zener

A

d. zener

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6
Q

Identify the correct name of the transistor symbol.

A
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7
Q

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

a. BJT

b. JFET

c. Triac

A

a. BJT

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8
Q

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

A

true

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9
Q

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

A

false

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10
Q

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

a.
open

b.
shorted

A

a. open

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11
Q

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

a.
open

b.
shorted

A

b. shorted

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12
Q

Capacitive, inductive and ultrasonic are three types of ______ sensors that are based on the sensor’s operating principles.

a. analog
b. contact
c. photoelectric
d. proximity

A

d. proximity

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13
Q

Sensors that use an NPN transistor to switch DC loads are current-______ devices.

a. sinking
b. sourcing

A

a. sinking

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14
Q

Current-sinking outputs use the ______ side of the DC output circuit as the switch leg to the load device.

a. negative
b. positive

A

a. negative

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15
Q

A ______ can be used to protect SSRs from brief voltage spikes.

a. metal-oxide varistor
b. semiconductor fuse
c. zener diode

A

a. metal-oxide varistor

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16
Q

Intermittent problems or erratic operation with a programmable relay most likely indicates a ______ problem.

a. hardware
b. software

A

a. hardware

17
Q

The fault current withstand rating of an MCC is determined by the highest rated device within the MCC.

True or False

A

False

18
Q

In corrosive atmospheres, copper buses in MCCs are often coated with ______ to protect the bus from corrosion.

a. carbon
b. tin
c. zinc

A

b. tin

19
Q

Reduced voltage starting techniques for DC motors have replaced DC motor drives in many DC motor applications.

True or False

A

False

20
Q

Most power distribution systems are designed for huge current fluctuations on their power grid.

True or False

A

False

21
Q

In troubleshooting a control circuit, the first step is to verify that ______ are (is) present.

a. control power
b. interlocking contacts
c. overload contacts

A

a. control power

22
Q

Troubleshooting control circuits involves using a ______ to analyze the control logic.

a. ladder diagram
b. one-line diagram
c. starter manufacture drawing
d. wiring diagram

A

a. ladder diagram

23
Q

Programmed timers’ output contacts change state when the ______ value equals the preset value.

a. accumulated
b. preset
c. time base

A

a. accumulated

24
Q

Use the ladder diagram and description as a reference. What is the timer mode for the second timer?

a. 1
b. 4
c. 10

A

a. 1

25
Q

Use the ladder diagram and description as a reference. What is the preset value for the second timer?

a. 1 minute
b. 5 minutes
c. 10 minutes

A

c. 10 minutes

26
Q

Use the ladder diagram and description as a reference. What is the timer unit for the second timer?

a. 0.00-99.99 sec
b. 0.0-999.9 sec
c. 0-9999 sec
d. 0-9999 min

A

d. 0-9999 min

27
Q

Use the ladder diagram and description as a reference. What is the current timer value for the second timer?

a. 5 sec
b. 10 sec
c. 5 min
d. 10 min

A

c. 5 min

28
Q

Identify the anode and the cathode for a zener diode.

A

JATC Year 3: Motor Control - Mid Term (8 decks)

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