Introduction to Motor Control and the Industry

Question 1

Which component standard rates motor controllers in HP?

A) IEC
B) NEMA

Answer 1

B) NEMA

Question 2

What UL Standard is the standard for Industrial Control Panels

A) UL 506
B) UL 506A
C) UL 508
D) UL 508A

Answer 2

D) UL 508A

Question 3

Which item, included in a NEMA Standard, would indicate procedures to determine if a motor control component was in compliance with manufacturing ratings?

A) Application
B) Dimensions
C) Scope
D) Testing

Answer 3

D) Testing

Question 4

Which organization was instrumental in the development of the SI standard?
A) IEC
B) NEMA

Answer 4

A) IEC

Question 5

Using the Left-Hand Rule for generators, the center finger indicates the direction of the ___?

A) current induced into the armature
B) direction of the conductor
C) motion of the conductor
D) north pole

Answer 5

A) current induced into the armature

Question 6

A voltage would be induced if there was a motion of electrons in a conductor caused by an interaction between the ___ and ___.

A) magnetic field of the circuit / magnetic force between the poles
B) magnetic field of the electrons / magnetic line of force
C) magnetic field of the circuit / flux lines of the magnet
D) magnetic field of the magnet / magnetic field of the electrons

Answer 6

C) magnetic field of the circuit / flux lines of the magnet

Question 7

Voltage can be increased in a DC generator by increasing the ___.

A) AWG size of the conductor cutting the magnetic field
B) resistance of the magnetic field
C) speed of the relative motion between the conductor and the magnetic field
D) time it takes for the armature to complete a full rotation

Answer 7

C) speed of the relative motion between the conductor and the magnetic field

Question 8

What items are normally found in a NEMA Standard?

I. Marking
II. Rating
III. Terms
IV. Warranty

A) I. and II.
B) I., II., III., and IV
C) II. and III.
D) II., III., and IV.

Answer 8

A) I. and II.

Question 9

Devices built according to the ___ standard have a smaller footprint.

A) IEC
B) NEMA

Answer 9

A) IEC

Question 10

In order to have voltage induced, there must be ___ between the conductor and the magnetic field.

A) electromagnetic induction
B) relative motion
C) reluctance
D) resistance

Answer 10

B) relative motion

Question 11

Which of the following organizations are identified in the text as standards-setting organizations for motor control devices?

I. International Brotherhood of Electrical Workers (IBEW)
II. International Electrotechnical Commission (IEC)
III. National Electrical Manufacturers Association (NEMA)
IV. National Fire Protection Association (NFPA)

A) I. and II.
B) I., II., III., and IV.
C) I. and III.
D) II. and III.
E) II., III., and IV.

Answer 11

D) II. and III.

Question 12

Which standard’s devices are considered application specific?

A) IEC
B) NEMA

Answer 12

A) IEC

Question 13

If the direction of the current flow changes, what else will change?

A) The amount of resistance in the circuit
B) The amount of voltage at the source
C) The direction of the conductor passing through the flux lines
D) The magnetic field of the electrons

Answer 13

C) The direction of the conductor passing through the flux lines

Question 14

Inducing a voltage into a conductor by passing it through a magnetic field is called ___.

A) electromagnetic induction
B) electrostatic induction
C) relative motion
D) reluctance

Answer 14

A) electromagnetic induction

Question 15

NEMA AC motors are designed for ___ power.

A) 50 Hz
B) 60 Hz

Answer 15

B) 60 Hz

Question 16

Which standards organization is associated with the International Organization for Standardization (ISO)?

A) IEC
B) NEMA

Answer 16

A) IEC

Question 17

As a standards organization, which of the following document formats are used with IEC standards?

I. ES - European Consensus
II. IS - International Standards
III. TR - Technical Reports
IV. UR - Universal Reports

A) I. and II.
B) I., II., III., and IV.
C) II. and III.
D) II., III., and IV.

Answer 17

C) II. and III.

Question 18

Using the Left-Hand Rule for generators, the ___ indicates the direction of the current induced into the armature.

A) index finger
B) middle/center finger
C) pinky
D) thumb

Answer 18

B) middle/center finger

Question 19

When using the UL 508A Panel Shop Color Code for industrial control panels, it is best to use ___ when wiring DC at control voltage.

A) black
B) blue
C) green
D) red

Answer 19

B) blue

Question 20

What rule is used to show motion, the direction of the magnetic field, and the direction of current flow for electromagnetic induction in DC theory?

A) The Left-Hand Rule for conductors
B) The Left-Hand Rule for generators
C) The Right-Hand Rule for conductors
D) The Right-Hand Rule for generators

Answer 20

B) The Left-Hand Rule for generators

Question 21

Sources of energy that drive machines are identified as ___ movers.

A) mechanical
B) prime
C) principle
D) renewable

Answer 21

B) prime

Question 22

If the number of loops in the wire that cuts a magnetic field ___, then the magnitude of voltage produced by electromagnetic induction will increase.

A) decreases
B) increases
C) remains constant

Answer 22

B) increases

Question 23

Which of the following electrical industry pioneers invented the first practical AC motor?

A) George Westinghouse
B) Nikola Tesla
C) Thomas Edison
D) Zenobe Gramme

Answer 23

B) Nikola Tesla

Question 24

A motor ___ is a device that governs the performance of an electric motor in a predefined manner.

A) controller
B) frequency
C) rotor
D) stator

Answer 24

A) controller

Question 25

When using the UL 508A Panel Shop Color Code for industrial control panels, it is best to use ___ when wiring AC at line voltage.

A) black
B) blue
C) green
D) red

Answer 25

A) black

Question 26

Which standard’s devices are designed for fast-acting, current-limiting fuses?

A) IEC
B) NEMA

Answer 26

A) IEC