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  • SUMMARY REVIEW OF UNITS 11–14

Electricity 1: Devices, Circuits and Materials

Thomas Kubala

Chapter 15

SUMMARY REVIEW OF UNITS 11–14 - all with Video Answers

Educators

Chapter Questions

Problem 1

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
Magnets are made of iron and iron____

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Problem 2

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
When like poles of a magnet are placed close to each other, they____

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Problem 3

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
The magnetic lines of force in the field of a magnet are referred to as____

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Problem 4

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
Lines of force are closed____

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Problem 5

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
The properties of a current-carrying conductor can be described as____

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Problem 6

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
Field strength is expressed by____

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Problem 7

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
The direction of the flux around a conductor carrying current is determined by the direction of the____

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Problem 8

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
The strength of an electromagnet depends on the amount of current, the number of turns, and the____

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Problem 9

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
The kind of magnetism that is present in a piece of iron that is brought near the $\mathrm{N}$ pole of a magnet is called____

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Problem 10

For items 1 through 10, select the word or phrase at the right to make each incomplete statement true. Place the letter of the selected answer in the space provided.
a. circles.
b. magnetic intensity.
c. current.
d. alloys.
e. core.
f. repel.
g. loops.
h. flux density.
i. voltage.
j. induced magnetism.
k. flux.
l. magnetic.
m. attract.
n. torque.
o. neutralize.
p. induced voltage.
q. wire size.
r. work.
s. energy.
The twisting force created by a singleloop armature motor is referred to as ____

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Problem 11

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Strong magnetic fields may best be established in a core made of____
a. air.
b. steel.
c. nickel.
d. cobalt.

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00:59

Problem 12

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Lines of force____
a. never cross.
b. often cross.
c. cross only under certain circumstances.
d. are unpredictable.

Keshav Singh
Keshav Singh
Numerade Educator

Problem 13

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Induced voltage in a conductor is a function of field strength, conductor length, and____
a. conductor CSA.
b. conductor wire size.
c. an external voltmeter.
d. conductor speed.

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Problem 14

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
An alternating EMF can be obtained from a generator with____
a. a commutator.
c. slip rings.
b. a split ring.
d. a load resistor.

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Problem 15

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Generally, the output voltage from a single-loop, two-pole generator is____
a. large.
c. very steady.
b. small.
d. adequate for most applications.

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Problem 16

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The kind of magnetism that remains in a core material when the magnetizing force is removed is called____
a. residual.
c. polarization.
b. magnetic.
d. north-south.

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Problem 17

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Maximum voltage is developed in a single-loop generator armature where the loop conductors in relation to the magnetic field move____
a. in a perpendicular direction.
c. at a low speed.
b. in a parallel direction.
d. away from the pole faces.

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09:44

Problem 18

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The alternating EMF generated in the single-loop armature of a two-pole generator reverses once every____
a. revolution.
c. quarter-revolution.
b. half-revolution.
d. two revolutions.

Vishal Gupta
Vishal Gupta
Numerade Educator

Problem 19

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The voltages that are induced in the armature conductors of a DC generator are____
a. unidirectional.
b. direct.
c. alternating.
d. at a constant magnitude.

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03:00

Problem 20

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The direction of movement of the conductor shown in Figure 15-1 is____
a. downward.
b. upward.
c. to the right.
d. to the left.
Figure 15-1 Conductor movement.

Mayukh Banik
Mayukh Banik
Numerade Educator

Problem 21

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The strength of an electromagnet depends mainly on the____
a. voltage and size of the wire.
b. current and the size of the wire used.
c. voltage and number of turns.
d. current and number of turns.

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01:29

Problem 22

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The voltage generated in a single-loop generator armature is____
a. DC.
c. alternating.
b. pulsating DC.
d. unidirectional.

Hunza Gilgit
Hunza Gilgit
Numerade Educator
01:10

Problem 23

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The commutator of a DC generator____
a. reverses the direction of the current in the armature.
b. changes $\mathrm{AC}$ to $\mathrm{DC}$ within the armature.
c. keeps the current in one direction in the load circuit.
d. acts only as a sliding electrical contact.

Hunza Gilgit
Hunza Gilgit
Numerade Educator
01:10

Problem 24

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Brushes are required on a DC motor to____
a. provide a sliding contact.
b. change the direction of current in the armature.
c. support the commutator.
d. change the direction of the current in the external circuit.

Hunza Gilgit
Hunza Gilgit
Numerade Educator

Problem 25

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
An electromagnetic field is used in DC motors to____
a. commutate the current more easily.
b. reverse the rotation.
c. give the motor greater speed.
d. give the motor higher torque.

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Problem 26

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Any magnet may have____
a. two kinds of poles.
b. many kinds of poles.
c. three kinds of poles.
d. one kind of pole.

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00:50

Problem 27

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Lines of magnetic force____
a. form closed loops pointing out at the $\mathrm{N}$ pole.
b. point from $\mathrm{N}$ to $\mathrm{S}$ within the magnet.
c. start at the $\mathrm{S}$ pole and end at the $\mathrm{N}$ pole outside the magnet
d. cross at the center of the magnet.

Keshav Singh
Keshav Singh
Numerade Educator

Problem 28

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The armature of a commercial DC generator has many loops c wire and many commutator segments to____
a. provide a high-resistance path.
b. balance the armature.
c. cause the current in the loops to be steady.
d. cause a high uniform output voltage.

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Problem 29

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
In a DC generator, the direction of the EMF induced in the armature depends on the____
a. number of lines of force.
b. speed of the armature.
c. action of the commutator.
d. magnetic polarity of the field poles.

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01:10

Problem 30

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
The commutator of a DC motor____
a. acts as a sliding contact only.
b. reverses the current in the armature conductors.
c. acts as bearing points for the commutator.
d. reverses the current in the load circuit.

Hunza Gilgit
Hunza Gilgit
Numerade Educator