Engine Electrical Systems DC Generators – Questions
With Correct Solutions
When ___________________ are cut by a conductor passing through them, voltage
is induced in the conductor. Right Ans - lines of magnetic force
If the ends of the conductor are connected to form a complete circuit, a
_________ is induced in the conductor. Right Ans - current
The conductor and the magnetic field make up an ____________________ Right
Ans - elementary generator
As the loop approaches the vertical position the induced voltage decreases
because both sides of the loop (A and B) are ___________________ to the lines of
force and the rate of cutting is reduced. Right Ans - approximately parallel
As the rotation of the loop continues, the number of lines of force cut
increases until the loop has rotated an additional _______________ to a horizontal
plane. Right Ans - ninety degrees
As rotation of the loop continues, the number of lines of force having been cut
again decreases, and the induced voltage becomes ___________. Right Ans -
zero
When a voltage is able to reverse itself from a positive to negative value, it is
called a ___________ voltage. Right Ans - alternating
When an electrical connection is connected in series with the external circuit,
this connection can be effected by opening the loop of wire and connecting its
two ends to two metal rings, called ___________. Right Ans - slip rings
Two _________ ride on the slip rings. Right Ans - metal brushes
By replacing the slip rings of the basic AC generator with two half cylinders,
called a ___________, a basic DC generator is obtained. Right Ans -
commutator
, The rotating parts of a DC generator (coil and commutator) are called
______________ Right Ans - an armature
The generation of an emf by the loop rotating in the magnetic field is the same
for both AC and DC generators, but the action of the commutator produces a
______________. Right Ans - DC voltage
In position A, no lines of force are cut by the coil sides, which means that
_________ is generated. Right Ans - no emf
In position B, the flux is now being cut at a maximum rate, which means that
the induced emf is _____________. Right Ans - maximum
The deflection of the meter is toward the ________, indicating the polarity of the
output voltage. Right Ans - right
In position C, the loop has completed _________ of rotation. Right Ans - one
hundred and eighty degrees
At position D, commutator action ___________ the current in the external circuit,
and the second half cycle has the same waveform as the first half cycle.
Right Ans - reverses
The process of commutation is sometimes called ____________, since this is the
conversion of an AC voltage to a DC voltage. Right Ans - rectification
The exact position where the short will occur when the generated emf is zero
is called ____________. Right Ans - the neutral plane
The voltage generated by the basic DC generator varies from zero to
_____________ twice for each revolution of the loop. Right Ans - maximum
value
The variation of DC voltage is called __________ and may be reduced by using
more loops, or coils. Right Ans - ripple
As the number of loops is _____________, the variation between maximum and
minimum values of voltage is reduced, and the output voltage of the generator
approaches a steady DC value. Right Ans - increased
With Correct Solutions
When ___________________ are cut by a conductor passing through them, voltage
is induced in the conductor. Right Ans - lines of magnetic force
If the ends of the conductor are connected to form a complete circuit, a
_________ is induced in the conductor. Right Ans - current
The conductor and the magnetic field make up an ____________________ Right
Ans - elementary generator
As the loop approaches the vertical position the induced voltage decreases
because both sides of the loop (A and B) are ___________________ to the lines of
force and the rate of cutting is reduced. Right Ans - approximately parallel
As the rotation of the loop continues, the number of lines of force cut
increases until the loop has rotated an additional _______________ to a horizontal
plane. Right Ans - ninety degrees
As rotation of the loop continues, the number of lines of force having been cut
again decreases, and the induced voltage becomes ___________. Right Ans -
zero
When a voltage is able to reverse itself from a positive to negative value, it is
called a ___________ voltage. Right Ans - alternating
When an electrical connection is connected in series with the external circuit,
this connection can be effected by opening the loop of wire and connecting its
two ends to two metal rings, called ___________. Right Ans - slip rings
Two _________ ride on the slip rings. Right Ans - metal brushes
By replacing the slip rings of the basic AC generator with two half cylinders,
called a ___________, a basic DC generator is obtained. Right Ans -
commutator
, The rotating parts of a DC generator (coil and commutator) are called
______________ Right Ans - an armature
The generation of an emf by the loop rotating in the magnetic field is the same
for both AC and DC generators, but the action of the commutator produces a
______________. Right Ans - DC voltage
In position A, no lines of force are cut by the coil sides, which means that
_________ is generated. Right Ans - no emf
In position B, the flux is now being cut at a maximum rate, which means that
the induced emf is _____________. Right Ans - maximum
The deflection of the meter is toward the ________, indicating the polarity of the
output voltage. Right Ans - right
In position C, the loop has completed _________ of rotation. Right Ans - one
hundred and eighty degrees
At position D, commutator action ___________ the current in the external circuit,
and the second half cycle has the same waveform as the first half cycle.
Right Ans - reverses
The process of commutation is sometimes called ____________, since this is the
conversion of an AC voltage to a DC voltage. Right Ans - rectification
The exact position where the short will occur when the generated emf is zero
is called ____________. Right Ans - the neutral plane
The voltage generated by the basic DC generator varies from zero to
_____________ twice for each revolution of the loop. Right Ans - maximum
value
The variation of DC voltage is called __________ and may be reduced by using
more loops, or coils. Right Ans - ripple
As the number of loops is _____________, the variation between maximum and
minimum values of voltage is reduced, and the output voltage of the generator
approaches a steady DC value. Right Ans - increased
