Chapter 79

Question 0

Current flow direction and intensity will:
A) affect magnetic field direction and intensity
B) affect the voltage
C) affect the resistance of a circuit
D) not affect electromagnetic field direction
E) not affect electromagnetic field intensity

Answer 0

A) affect magnetic field direction and intensity

Question 1

The space or zone around a magnet through which lines of force travel is termed:
A) magnetic flux
B) permeability
C) reluctance
D) magnetic strength
E) magnetic field

Answer 1

E) magnetic field

Question 2

The right hand rule is used to:
A) indicate the speed of a rotor
B) determine the direction of induced current flow
C) determine the frequency of an alternator
D) determine the direction of motor rotation
E) determine magnetic flux rotation

Answer 2

B) determine the direction of induced current flow

Question 3

A current carrying conductor being moved by a magnetic field illustrates the principle known as:
A) magnetic flux
B) electrolysis
C) hydro electrics
D) generator action
E) motor action

Answer 3

E) motor action

Question 4

The field around a magnet is made up of lines of force which travel from the _____ pole to the _____ pole outside the magnet and from the ____ pole to the ____ pole within the magnet.

Answer 4

North to south outside, south to north within

Question 5

Three variables that determine the strength of a magnetic field around an electromagnet are:

Answer 5

The current flowing through the conductor
The number of turns of wire in the coil
The permeability of the core

Question 6

List three methods that can be used to increase the voltage generated as a conductor is passed through a magnetic field:

Answer 6

Increase the speed that the lines of force are cut (move the conductor more quickly)
Increase the magnetic field
Increase the number of conductors cutting the magnetic field with the connectors connected in series (use a coil)