A conductor carrying a current always has:

1.   ?    a lower temperature than the surroundings.
2.   ?    a magnetic field associated with it.
3.   ?    zero resistance between the ends.
4.   ?    zero voltage across the ends

When a wire is moved at right angles to a magnetic field, which one of these is true?

1.   ?    A voltage is induced, regardless of what the material is. A current flows only if the wire is connected to an outside circuit.
2.   ?    A voltage is induced, but only if the wire is made of a magnetic material. A current flows only if the wire is connected to an outside circuit.
3.   ?    A voltage is induced, regardless of what the material is. A current flows even if the wire is not connected to an outside circuit.
4.   ?    A voltage is induced, but only if the wire is made of a magnetic material. A current flows even if the wire is not connected to an outside circuit.

The induction of a voltage by moving a wire through a magnetic field is called:

1.   ?    the Gravity Effect
2.   ?    the Motor Effect
3.   ?    the Generator Effect
4.   ?    the Battery Effect

Which one of these is NOT a way of increasing the induced voltage?

1.   ?    increasing the area of the wire
2.   ?    increasing the speed of the wire through the magnetic field.
3.   ?    increasing the strength of the magnetic field.
4.   ?    increasing the angle of movement from 90 degrees to 180 degrees

Which one of these angles of movement to the magnetic field results in zero volts being induced?

1.   ?    0 degrees (i.e. parallel)
2.   ?    30 degrees
3.   ?    45 degrees
4.   ?    90 degrees

The one difference between the simple motor in Topic 7 and the generator in Topic 8 was:

1.   ?    the generator had no magnets.
2.   ?    the generator had no armature.
3.   ?    the generator had slip-rings instead of a commutator.
4.   ?    the generator had no brushes.

If the generator is made to move faster, which one of the following changes would you expect to see?

1.   ?    The minimum voltage produced will increase.
2.   ?    The maximum negative value of the voltage will increase.
3.   ?    The maximum positive value of the voltage will increase.
4.   ?    Both the maximum negative value and the maximum positive value of the voltage will increase.

Which one of these statements is true about practical generators?

1.   ?    The only generators possible have magnets that are stationary and coils that move.
2.   ?    The only generators possible have coils that are stationary and magnets that move.
3.   ?    Either the magnets can move with stationary coils or the coils can move with stationary magnets.
4.   ?    Both the coils and the magnets have to turn at the same rate.

What is the output of a generator in which the armature is connected to the brushes by slip-rings?

1.   ?    AC
2.   ?    DC
3.   ?    DC or WC
4.   ?    AC or DC

A large generator that produces AC is often called:

1.   ?    a rotor
2.   ?    a stator
3.   ?    an alternator
4.   ?    an exciter