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Distributed Generation > Motor Control III > Flashcards

Motor Control III Flashcards

1
Q

The magnetic ? coil produces a magnetic field between the breaking contacts that forces the arc up, increasing the length of the arc and causing it to dissipate faster.
Select one:

a.
blowout

b.
contactor

c.
overload

A

A

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2
Q

DC drives use a ? method to smoothly accelerate and decelerate the motor.
Select one:

a.
reduced voltage

b.
ramping

c.
soft start

A

B

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3
Q

The braking resistor is connected to the ? during dynamic breaking.
Select one:

a.
armature leads

b.
field winding leads

A

A

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4
Q

Regenerative braking returns the regenerated power of a DC motor back to the ? .
Select one:

a.
capacitor

b.
DC generator

c.
power source

A

C

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5
Q

What type of signal is continuous, varying from a minimum to a maximum value?
Select one:

a.
Analog

b.
Discrete

A

A

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6
Q

What type of signal has only two states: ON and OFF?
Select one:

a.
Analog

b.
Discrete

A

B

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7
Q

0-10 VDC, 4-20 ma, and 3-15 psi are examples of what type of signal?
Select one:

a.
Analog

b.
Discrete

A

A

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8
Q

When analog control devices are located large distances from each other, which type of signal is preferable for installing the control wiring?
Select one:

a.
Current

b.
Voltage

A

A

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9
Q

A certain process control system utilizes a tank that is 10 feet tall. The transducer that measures the level of liquid in the tank is located 2 feet from the bottom of the tank. If a 1-5 VDC signal is used to monitor the top 8 feet of water in the tank, how much water is in the tank when the analog value read at the transducer is 3.5 VDC?
Select one:

a.
5

b.
7

c.
9

A

B

Note: A 4 volt signal (5 V – 1 V) represents 8 feet of water in the tank. 4 V/8 feet = 0.5 volts per foot. 3.5 volts represents 3.5 V – 1 V = 2.5 volts of signal. 2.5 V/0.5 V = 5 feet of water. Since the transducer is only monitoring the top 8 feet of water in the tank, the height of water in the tank is 2 feet (not monitored) + 5 feet (the measured value) = 7 feet. There are 7 feet of water in the tank.

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10
Q

A thermistor is used to measure temperature in a process. The circuit includes an indicator that shows the temperature to be 88°C. Convert the Celsius temperature to its equivalent Fahrenheit value.
Select one:

a.
120°F

b.
190.4°F

c.
216°F

A

B

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11
Q

When two or more thermocouples are connected in ? to increase the output voltage from the sensor, the connection is referred to as a thermopile.
Select one:

a.
parallel

b.
series

A

B

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12
Q

The self-diagnostic capabilities of smart devices are helpful when troubleshooting smart systems.
Select one:
True
False

A

True

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13
Q

Motor control systems that control motor speed without feedback data for torque or speed are called ? control systems.
Select one:

a.
closed-loop

b.
open-loop

A

B

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14
Q

A motor control system that uses a tachometer to control the speed of the motor is called a(n) ? system.
Select one:

a.
closed-loop

b.
open-loop

A

A

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15
Q

Which IEC standard programming language most closely replicates the control diagrams used in traditional magnetic motor control?
Select one:

a.
Function block diagrams

b.
Instruction list

c.
Ladder logic

d.
Sequential function charts

e.
Structured text

A

C

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16
Q

The MicroLogix™ 1000 controller manufactured by Allen Bradley is a stand-alone controller and all inputs and outputs (I/O), both discrete and analog, can be connected to the main chassis of the controller.
Select one:
True
False

A

True

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17
Q

Three-phase motors typically have slip, which is the difference between the rotational speed of the rotor of the motor and the rotational speed of the magnetic field in the stator of the motor. What is the slip of a synchronous motor?
Select one:

a.
0 (zero)

b.
3%

c.
5%

A

A

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18
Q

The ? motor is a 3-phase motor in which the rotor turns at the same speed as the magnetic field of the stator.
Select one:

a.
servo

b.
stepper

c.
synchronous

A

C

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19
Q

The ? motor converts electronic digital pulses into mechanical rotational steps.
Select one:

a.
servo

b.
stepper

c.
synchronous

A

B

20
Q

The ? motor is a position or motion correcting motor that is driven to a specific angular position as commanded by a control signal.
Select one:

a.
servo

b.
stepper

c.
synchronous

A

A

21
Q

For a stepper motor with an angular resolution of 1.8° per step, indicate the number of discrete steps required to achieve complete 360° rotation of the shaft.
Select one:

a.
4

b.
200

c.
500

A

B

22
Q

For a stepper motor with an angular resolution of 90° per step, indicate the number of discrete steps required to achieve complete 360° rotation of the shaft.
Select one:

a.
4

b.
200

c.
500

A

A

23
Q

For a stepper motor with an angular resolution of 0.72° per step, indicate the number of discrete steps required to achieve complete 360° rotation of the shaft.
Select one:

a.
4

b.
200

c.
500

A

C

24
Q

The maximum amount of torque provided by a load that a stepper motor can withstand without moving from its position, with the stator energized. Answer 1
Holding torque
Correct
The maximum amount of torque provided by a load that a stepper motor can withstand without moving from its position, with the stator de-energized. Answer 2
Detent torque
Correct
The maximum number of steps the motor makes in one second. Answer 3
Stepping rate
Correct
The number of degrees that the motor moves per step. Answer 4
Step angle
Correct

A

<-

25
Q

A technology with all network devices connected to a central network media or cable identified as the backbone. Answer 1
Bus topology

A technology with all network devices connected to a common device called a hub or switch. Answer 2
Star topology

A technology with all network devices connected to a network media or cable, which is connected in a loop. Answer 3
Ring topology

A

<-

26
Q

A specification for an Ethernet® network calls for a 100BaseT system. What type of cable would be used for this network?
Select one:

a.
Coaxial cable

b.
Fiber-optic cable

c.
STP (shielded twisted pair)

d.
UTP (unshielded twisted pair)

A

D

27
Q

Which basic troubleshooting technique includes four levels of testing?
Select one:

a.
Block diagrams

b.
Bracketing

c.
Information funneling

d.
Signal flow

A

C

28
Q

Which signal flow topology could include linear, divergent, or convergent paths and contains switches that can change the flow of the signal?
Select one:

a.
Convergent

b.
Divergent

c.
Feedback

d.
Linear

e.
Switched path

A

E

29
Q

When applying the ? technique and when brackets are widely separated on the system where the problem is present, tests selected for identifying the fault tend to be more general in nature.
Select one:

a.
Block diagrams

b.
Bracketing

c.
Information funneling

d.
Signal flow
Incorrect

e.
Signal flow analysis

A

C

30
Q

At which step in a funneling analysis troubleshooting procedure are tests generally limited to a single unit in the system block diagram?
Select one:

a.
Level 1

b.
Level 2

c.
Level 3

d.
Level 4

A

C

31
Q

By bracketing and funneling analysis procedures, pointless and irrelevant system tests are avoided, redundant system tests are eliminated, and tests are not performed prematurely, eliminating wasted effort on tests which do not produce usable results.
Select one:
True
False

A

True

32
Q

A ? is used to limit armature current in a DC motor during start-up
Select One:
A: Rheostat
B: Tachometers
C: DC Drive(s)
D: Armature

A

A

33
Q

? and encoders are used to monitor speed on a DC motor.
Select One:
A: Rheostat
B: Tachometers
C: DC Drive(s)
D: Armature

A

B

34
Q

? have a power section to convert AC into DC.
Select One:
A: Rheostat
B: Tachometers
C: DC Drive(s)
D: Armature

A

C

35
Q

We can change either the field winding polarity or the ? winding polarity to reverse a DC motor.
Select One:
A: Rheostat
B: Tachometers
C: DC Drive(s)
D: Armature

A

D

36
Q

A common issue with ? is that the brushes are not free to move in the holder. Bound up brushes are not able to maintain spring tension to make a proper connection.
Select One:
A: DC motors
B: Mercury Float Switches
C: Signal Converters
D: Limit-Alarm Relay

A

A

37
Q

? would be considered a discrete output because they are either on or off.
Select One:
A: DC motors
B: Mercury Float Switches
C: Signal Converters
D: Limit-Alarm Relay

A

B

38
Q

Three kinds of signals are common for controls. Voltage, current, and pressure. There are ? for changing all three types to another type.
Select One:
A: DC motors
B: Mercury Float Switches
C: Signal Converters
D: Limit-Alarm Relay

A

C

39
Q

A ? could be used in a 0-10VDC system to turn on a motor starter. Relays with a 0-10VDC coil are not used in such an application
Select One:
A: DC motors
B: Mercury Float Switches
C: Signal Converters
D: Limit-Alarm Relay

A

D

40
Q

A ? is made by connecting several thermocouples in series. This provides a higher voltage output.
Select One:
A: Thermopile
B: Control Valve
C: Diodes
D: Open-Loop systems

A

A

41
Q

We can use a current source to check a ? for proper operation
Select One:
A: Thermopile
B: Control Valve
C: Diodes
D: Open-Loop systems

A

B

42
Q

AC/DC input devices use reversed parallel ? to allow different types of input signals.
Select One:
A: Thermopile
B: Control Valve
C: Diodes
D: Open-Loop systems

A

C

43
Q

? have no feedback loop to monitor the output. They are manually controlled.
Select One:
A: Thermopile
B: Control Valve
C: Diodes
D: Open-Loop systems

A

D

44
Q

? Systems have a feedback loop and can self-regulate the output of the system
Select One:
A: Closed-Loop
B: VFD
C: Temperature
D: PLC’s

A

A

45
Q

When installing a ? , we must consider the temperature of the environment, grounding, and quality.
Select One:
A: Closed-Loop
B: VFD
C: Temperature
D: PLC’s

A

B

46
Q

If a VFD had been running for several months, we could generally eliminate programming issues as a cause of failure. We would look at the ? of the environment, grounding, and power quality.
Select One:
A: Closed-Loop
B: VFD
C: Temperature
D: PLC’s

A

C

47
Q

Allen Bradley ? are programmed using RSLogix 500 Software.
Select One:
A: Closed-Loop
B: VFD
C: Temperature
D: PLC’s

A

D

Distributed Generation (23 decks)

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