Question 1

A turbogenerator produces

Accepted Answer

A) energy. 
B) power. 
C) neither, but transforms energy from one form to another. 
D) none of the above 
A) energy. 
B) power. 
C) neither, but transforms energy from one form to another. 
D) none of the above

Question 2

Induced electric and magnetic fields result in

Accepted Answer

A) electromagnetic waves. 
B) stronger electric or magnetic fields. 
C) higher voltages produced by Faraday induction. 
D) all of the above 
E) none of the above 
A) electromagnetic waves. 
B) stronger electric or magnetic fields. 
C) higher voltages produced by Faraday induction. 
D) all of the above 
E) none of the above

Question 3

Magnetic field strength inside a current-carrying coil will be greater if the coil encloses a

Accepted Answer

A) vacuum. 
B) wooden rod. 
C) glass rod. 
D) rod of iron. 
E) none of the above 
A) vacuum. 
B) wooden rod. 
C) glass rod. 
D) rod of iron. 
E) none of the above

Question 4

The primary of a transformer is the coil connected to

Accepted Answer

A) the load. 
B) the Internet. 
C) the input power line. 
D) none of the above 
A) the load. 
B) the Internet. 
C) the input power line. 
D) none of the above

Question 5

The voltage across the input terminals of a transformer is 120 V. The primary has 50 loops and the secondary has 25 loops. The voltage the transformer delivers is

Accepted Answer

A) 30 V. 
B) 60 V. 
C) 120 V. 
D) 240 V. 
E) none of the above 
A) 30 V. 
B) 60 V. 
C) 120 V. 
D) 240 V. 
E) none of the above

Question 6

If the voltage produced by a generator alternates, it does so because

Accepted Answer

A) unlike a battery, it produces alternating current. 
B) the changing magnetic field that produces it alternates. 
C) of alterations in the mechanical energy input. 
D) all of the above 
E) none of the above 
A) unlike a battery, it produces alternating current. 
B) the changing magnetic field that produces it alternates. 
C) of alterations in the mechanical energy input. 
D) all of the above 
E) none of the above

Question 7

Transformers use ac to satisfy the required

Accepted Answer

A) transfer of energy from coil to coil. 
B) voltage for transformation. 
C) change in magnetic field for operation. 
D) change in input current. 
E) magnetic field intensities. 
A) transfer of energy from coil to coil. 
B) voltage for transformation. 
C) change in magnetic field for operation. 
D) change in input current. 
E) magnetic field intensities.

Question 8

The discovery of electromagnetic induction is credited to

Accepted Answer

A) Joseph Henry in America. 
B) Michael Faraday in England. 
C) both of these 
D) neither of these 
A) Joseph Henry in America. 
B) Michael Faraday in England. 
C) both of these 
D) neither of these

Question 9

The metal detectors that people walk through at airports operate via

Accepted Answer

A) Ohm's law. 
B) Faraday's law. 
C) Coulomb's law. 
D) Newton's laws. 
E) civil laws. 
A) Ohm's law. 
B) Faraday's law. 
C) Coulomb's law. 
D) Newton's laws. 
E) civil laws.

Question 10

An iron core in a transformer

Accepted Answer

A) guides magnetic field lines. 
B) shields unwanted external electric or magnetic fields. 
C) separates the primary and secondary regions. 
D) reduces energy losses. 
A) guides magnetic field lines. 
B) shields unwanted external electric or magnetic fields. 
C) separates the primary and secondary regions. 
D) reduces energy losses.

Question 11

A transformer produces

Accepted Answer

A) energy. 
B) power. 
C) neither, but transforms mechanical energy to electric energy. 
D) none of the above 
A) energy. 
B) power. 
C) neither, but transforms mechanical energy to electric energy. 
D) none of the above

Question 12

Thrust a magnet into the opening of a rubber band and it

Accepted Answer

A) rotates. 
B) then has a current in it. 
C) both of these 
D) neither of these 
A) rotates. 
B) then has a current in it. 
C) both of these 
D) neither of these

Question 13

The output power of an ideal transformer is

Accepted Answer

A) greater than the input power. 
B) equal to the input power. 
C) smaller than the input power. 
D) may be any of the above 
A) greater than the input power. 
B) equal to the input power. 
C) smaller than the input power. 
D) may be any of the above

Question 14

The induced electric and magnetic fields of Maxwell are

Accepted Answer

A) parallel to each other. 
B) perpendicular to each other. 
C) non-directional. 
A) parallel to each other. 
B) perpendicular to each other. 
C) non-directional.

Question 15

Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 120 V. What is the power output of the secondary coil?

Accepted Answer

A) 30 W 
B) 120 W 
C) 480 W 
D) 960 W 
E) need more information 
A) 30 W 
B) 120 W 
C) 480 W 
D) 960 W 
E) need more information

Question 16

A transformer transforms voltage while

Accepted Answer

A) producing energy. 
B) producing power. 
C) transferring energy from one coil to another. 
D) transferring current from one coil to another. 
A) producing energy. 
B) producing power. 
C) transferring energy from one coil to another. 
D) transferring current from one coil to another.

Question 17

When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is

Accepted Answer

A) half. 
B) the same. 
C) twice. 
D) four times as much. 
E) none of the above 
A) half. 
B) the same. 
C) twice. 
D) four times as much. 
E) none of the above

Question 18

Faraday's law underlies the operation of

Accepted Answer

A) an electric guitar. 
B) a shake flashlight. 
C) the changing of traffic lights. 
D) all of the above 
E) none of the above 
A) an electric guitar. 
B) a shake flashlight. 
C) the changing of traffic lights. 
D) all of the above 
E) none of the above

Question 19

The transmission of power from one place to another is evident in

Accepted Answer

A) household electricity. 
B) radio broadcast. 
C) mobile phones. 
D) all of the above 
A) household electricity. 
B) radio broadcast. 
C) mobile phones. 
D) all of the above

Question 20

Underlying the concept of self-induction is

Accepted Answer

A) Ohm's law. 
B) Faraday's law. 
C) Maxwell's law. 
D) all of these about equally 
A) Ohm's law. 
B) Faraday's law. 
C) Maxwell's law. 
D) all of these about equally

Exam 25: Electromagnetic Induction

A turbogenerator produces

Induced electric and magnetic fields result in

Magnetic field strength inside a current-carrying coil will be greater if the coil encloses a

The primary of a transformer is the coil connected to

The voltage across the input terminals of a transformer is 120 V. The primary has 50 loops and the secondary has 25 loops. The voltage the transformer delivers is

If the voltage produced by a generator alternates, it does so because

Transformers use ac to satisfy the required

The discovery of electromagnetic induction is credited to

The metal detectors that people walk through at airports operate via

An iron core in a transformer

A transformer produces

Thrust a magnet into the opening of a rubber band and it

The output power of an ideal transformer is

The induced electric and magnetic fields of Maxwell are

Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 120 V. What is the power output of the secondary coil?

A transformer transforms voltage while

When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is

Faraday's law underlies the operation of

The transmission of power from one place to another is evident in

Underlying the concept of self-induction is

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