PRE-PUBLICATION DRAFT MATERIAL
CHAPTER
13 SELF-Quiz
K/U
For each question, select the best answer from the four
alternatives.
1. In Faraday’s ring, which of the following actions
causes electromagnetic induction in the secondary
coil? (13.1) K/U
(a) turning the direct current on in the primary circuit
(b) turning the direct current off in the primary circuit
(c) turning the direct current on and off repeatedly
in the primary circuit
(d) all of the above
2. Which of the following descriptions is consistent with
Lenz’s law? (13.2) K/U
(a) If a north magnetic pole is moved into a coil, the
same side of the coil is now a south magnetic pole.
(b) If a north magnetic pole is moved out of a coil, the
same side of the coil is now a south magnetic pole.
(c) If a south magnetic pole is moved into a coil, the
opposite side of the coil is now a south magnetic
pole.
(d) If a south magnetic pole is moved out of a coil,
the opposite side of the coil is now a north
magnetic pole.
3. Alternating current has which of the following
properties? (13.3) K/U
(a) Electrons travel in one direction only.
(b) Voltage and current rise and fall periodically.
(c) Electrons travel from the distribution panel to
your room to operate your lamp.
(d) Voltage and current remain constant.
4. Which of the following statements is true about an
AC generator? (13.4) K/U
(a) It contains a split ring commutator and brushes.
(b) Its spin rate is independent of the frequency of
electricity generated.
(c) It contains two different slip rings and brushes.
(d) It produces maximum current when the coils of wire
are perpendicular to the external magnetic field.
5. Which of the following correctly describes a step-up
transformer? (13.5) K/U
(a) The number of windings on the primary coil
is greater than the number of windings on the
secondary coil.
(b) The current in the primary coil is less than the
current in the secondary coil.
(c) The voltage on the primary coil is less than the
voltage on the secondary coil.
(d) The ratio of the number of primary windings to the
number of secondary windings is greater than one.
Knowledge/Understanding Thinking/Investigation C
Communication A
Application
6. Which of the following correctly describes a stepdown transformer? (13.5) K/U
(a) The number of windings on the secondary coil
is greater than the number of windings on the
primary coil.
(b) The current in the secondary coil is greater than
the current in the primary coil.
(c) The voltage on the secondary coil is greater than
the voltage on the primary coil.
(d) The ratio of the number of primary windings to
the number of secondary windings is less than
one.
7. Which of the following descriptions would provide
the most efficient electrical energy transmission?
(13.6) K/U
(a) low-voltage and high-current DC
(b) high-voltage and low-current AC
(c) low-voltage and high-current AC
(d) high-voltage and high-current AC
Indicate whether each statement is true or false. If you think
the statement is false, rewrite it to make it true.
8. A magnetic field with a larger change in magnitude
induces less current in a conductor than a magnetic
field with a smaller change in magnitude. (13.1) K/U
9. The magnetic field induced in a coil always aligns
exactly with the magnetic field that produced it.
(13.2) K/U
10. A fuse has a metal strip in it that heats up and melts
when too much current is drawn through it, and then
it needs to be replaced. (13.3) K/U
11. The majority of devices used in North American
homes require 240 V. (13.3) K/U
12. AC generators in North America produce electricity
with a frequency of 60 Hz. (13.4) K/U
13. A step-up transformer has more windings on the
secondary coil than on the primary coil. (13.5) K/U
14. In a step-up transformer both the current and the
potential difference are increased in the secondary
circuit. (13.5) K/U
15. The power lost in transmission is proportional to the
square of the current. (13.6) K/U
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Chapter 13 Self-Quiz 31
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T/I
posted to 1st pass folder 9-9-10
9/8/10 5:48:02 PM