Chapter 14, DIRECT-CURRENT MOTOR PRINCIPLES Video Solutions, Electricity 1: Devices, Circuits and Materials

Problem 1

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
The right-hand motor rule is usually used to determine_____
a. flux density.
b. the direction of conductor movement.
c. conductor speed.
d. flux direction.
e. induced current.

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01:54

Problem 2

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
In Figure 14-9, conductor movement will be_____
a. upward.
b. downward.
c. to the right.
d. to the left.
Figure 14-9
Conductor
e. constant. movement.

Adriano Chikande

Numerade Educator

05:44

Problem 3

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
Torque on a single loop of wire in a magnetic field is _____
a. constant.
b. strength.
c. the same as field flux.
d. the turning force.
e. never at a maximum value.

Vishal Gupta

Numerade Educator

03:06

Problem 4

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
The amount of torque on a current-carrying conductor in a magnetic field depends upon_____
a. the amount of current in the conductor.
b. the direction of the magnetic field between the two poles.
c. the current direction in the conductor.
d. the direction of rotation.
e. the left-hand rule.

Amit Srivastava

Numerade Educator

Problem 5

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
To obtain motor action, current is supplied to a loop of wire in a magnetic field by_____
a. slip rings.
b. split rings.
c. a commutator.
d. brushes.
e. brushes and a commutator.

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Problem 6

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
If another loop of wire is added to make a double-loop armature,_____
a. the torque becomes steadier.
b. the magnetic field decreases in value.
c. loop current direction is affected.
d. the torque becomes less smooth.
e. commutator segments must be reduced in number.

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01:44

Problem 7

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
The principle of motor action is_____
a. a conversion of mechanical energy to electrical energy.
b. a conversion of chemical energy to electrical energy.
c. a conversion of electrical energy to mechanical energy.
d. an unpredictable phenomenon.
e. predictable with the left-hand rule.

Ankur S

Numerade Educator

00:34

Problem 8

Torque in a motor is a function of field flux and conductor flux. How can conductor flux be increased?
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