Question 1

As the current in the stator circuit increases, the stator ____________________ also increases.

Accepted Answer

flux

Question 2

In the ____________________ method, an additional compensating winding is placed in slots cut in the pole faces.

Accepted Answer

conductive compensation

Question 3

Describe a bifilar stepping motor.

Accepted Answer

The term bifilar means that there are two windings wound together. This is similar to a transformer winding with a center-tap lead. A bifilar stepping motor has twice as many windings as does the three-lead type, which makes it necessary to use smaller wire in the windings. This results in higher wire resistance in the winding, producing a better inductive-resistive (L/R) time constant for the bifilar wound motor. The increased L/R time constant results in better motor performance. The use of a bifilar stepper motor also simplifies the drive circuitry requirements. Notice that the bifilar motor does not require an aboveground-belowground power supply. As a general rule, the power supply voltage should be about five times greater than the motor voltage. A current-limiting resistance is used in the common lead of the motor. This current-limiting resistor also helps improve the L/R time constant.

Question 4

A(n) ____________________ network can be used to provide the 90° phase shift needed to change single-phase ac into two-phase ac.

Accepted Answer

The answer of A(n) ____________________ network can be used to...

Question 5

When stepping motors are used as two-phase synchronous motors, they have the ability to virtually start, stop, or reverse direction of rotation instantly.

Accepted Answer

Stepping motors, when used as two-phase synchronous motors, are designed to move in precise, fixed angle increments. This allows them to start, stop, or reverse direction almost instantly, as they can be precisely controlled through electrical pulses without the need for physical gearing or complex mechanisms.

Question 6

A repulsion-induction motor has nearly the same operating characteristics as a repulsion-start, induction-run motor, but this type of motor has no ____________________ mechanism.

Accepted Answer

The answer of A repulsion-induction motor has nearly the same...

Question 7

Describe stepping motors that are operated on ac voltage.

Accepted Answer

The answer of Describe stepping motors that are operated on...

Question 8

Universal motors operate at different speeds on dc and single-phase ac.

Accepted Answer

The answer of Universal motors operate at different speeds on...

Question 9

The rotor of the resistance-start, induction-run motor is the same as that of a three-phase, squirrel-cage induction motor.

Accepted Answer

Both the resistance-start, induction-run motor and the three-phase, squirrel-cage induction motor utilize a squirrel-cage rotor design, which is characterized by its simplicity and durability.

Question 10

Stepping motors are devices that convert mechanical movement into electrical impulses.

Accepted Answer

Stepping motors convert electrical impulses into mechanical movement.

Question 11

What are the two main types of single-phase induction motors?

Accepted Answer

The answer of What are the two main types of...

Question 12

What are the basic parts of a resistance-start, induction-run motor?

Accepted Answer

The answer of What are the basic parts of a...

Question 13

The term ____________________ means that there are two windings wound together.

Accepted Answer

The answer of The term ____________________ means that there are...

Question 14

What is the theory of operation for stepping motors?

Accepted Answer

The answer of What is the theory of operation for...

Question 15

Most single-phase motors have fractional horsepower ratings.

Accepted Answer

Most single-phase motors are designed for low-power applications, typically having horsepower ratings less than one, hence the term "fractional horsepower" motors.

Quiz 18: Single-Phase Motors