Question 1

Provide two considerations that must be taken into account when selecting NEMA or IEC standards for installations.

Accepted Answer

Consider the following when selecting NEMA or IEC standards for installations:
• How much expertise do you need to make the proper selection?
• Do you want to dedicate the increased space usually needed for NEMA controllers?
• Do you have a good understanding of the application?
• If you are replacing an existing installation, what other components have to be changed?
• How much is cost a factor compared to interchangeability?
• Are overloads adjustable or changeable?
These questions, along with the difference in price, must be considered when determining the proper selection.

Question 2

____________________ are resistors that change resistance due to thermal effects.

Accepted Answer

Thermistors
Thermal resistors

Question 3

The programmable parameters of a digital controller must be set when installing a new electronic drive.

Accepted Answer

The programmable parameters of a digital controller, such as gains and limits, must be set during installation to ensure optimal performance and safety.

Question 4

IEC standards can be used to select the most suitable controller; the IEC philosophy is that ____________________ is a critical part of the selection process.

Accepted Answer

The answer of IEC standards can be used to select...

Question 5

A typical ____________________ is an electronic circuit type of sensor that produces a small magnetic field at a radio frequency (RF).

Accepted Answer

The answer of A typical ____________________ is an electronic circuit...

Question 6

____________________ controls, which use a variety of devices to detect the presence or absence of light, are used where physical contact is not needed or desired.

Accepted Answer

The answer of ____________________ controls, which use a variety of...

Question 7

A simple vector drive is fairly accurate but does not use much feedback from the motor, whereas a PWM drive has tighter control and more feedback from the motor operations.

Accepted Answer

A simple vector drive does use feedback from the motor to control speed and torque accurately, whereas a PWM (Pulse Width Modulation) drive primarily controls the motor by varying the pulse width to adjust the voltage and current to the motor, which doesn't inherently imply more feedback from the motor operations.

Question 8

Rather than using a direct connection to the motor through a speed sensor to control the output to the motor, a(n) ____________________ measures the different components of the current delivery to the motor.

Accepted Answer

The answer of Rather than using a direct connection to...

Question 9

The International Electrotechnical Commission (IEC), headquartered in Geneva, Switzerland, is a counterpart to the National Electrical Manufacturers Association (NEMA).

Accepted Answer

The statement is correct. The IEC is a global organization that develops and publishes international standards for the electrical and electronics industries, while NEMA is an American trade association for electrical equipment and medical imaging manufacturers.

Question 10

Briefly describe two considerations when selecting a starter for a particular motor drive situation.

Accepted Answer

The answer of Briefly describe two considerations when selecting a...

Question 11

The capacitive proximity sensor has an advantage over the inductive sensor in that it can detect both nonmetallic and metallic objects.

Accepted Answer

The statement is true. Capacitive proximity sensors can detect both metallic and nonmetallic objects because they work by detecting changes in the capacitance between the sensor and the object being detected, rather than relying on magnetic fields like inductive sensors.

Question 12

Briefly explain the difference between the pulse-width-modulation (PWM) method of controlling output voltage and motor current, and the flux vector method of controlling the output to the motor.

Accepted Answer

The answer of Briefly explain the difference between the pulse-width-modulation...

Question 13

Name two important considerations when determining the proper photoelectric device to use.

Accepted Answer

The answer of Name two important considerations when determining the...

Question 14

The least complicated photoelectric sensors are called direct-scan sensors. Although they are harder to keep in alignment, they are used extensively.

Accepted Answer

Direct-scan sensors are indeed simple photoelectric sensors that are commonly used, but they may require more maintenance to keep in alignment compared to other types of sensors.

Question 15

What are two limitations of the capacitive sensor?

Accepted Answer

The answer of What are two limitations of the capacitive...

Quiz 15: The Three-Phase, Wound-Rotor Induction Motor