Suitable brush pressure for DC generators is usually between_____
1 & 2 psi
2&3 psi
3&4 psi
4&5 psi
In the case of a generator, the voltage regulation is determined by the resistance of the _______
Field winding
Shunt winding
Armature winding
Compensation winding
The value of field resistance that will limit field current to a value insufficient for voltage build up is called_____
Saturation resistance
Critical field resistance
Zero output limit
Field saturation
Interpole coils consist of ______
Small number of turns of large gage wire
Small number of turns of small gage wire
Large number of turns of large gag wire
Large number of turns of small gage wire
Interpole coils are connected
Across the armature
Across the series field
In series with the armature
In series with the shunt field
A 100KW DC generator is operating at full load; it requires 125KW to turn the generator. What is the efficiency of the generator?
30%
50%
80%
95%
The position at which there is no voltage in the armature is
Equalizer area
Excitation
Neutral plane
Location of the field poles
Which of the following is not a type of DC generator
Compound
Electro-magnetic
Shunt
Series
The winding that provides high voltage and low current is
Frog-leg
Lap wound
Wave wound
Lap-wave wound
The winding that provides moderate voltage and current is?
Frog-leg wound
The item that ride against the commutator to make electrical connection are
Field windings
Armature windings
Brush
Pole pieces
The magnetic field is sometimes provide by electromagnets. This is done by windings that are wound around the
Brushes
Pole piece
Armature
Case
A device that converts mechanical input into DC electrical output is a
Alternator
Generator
Motor
Inverter
The rotating part of the generator is called the
Stator
Field
Exciter
The components of a DC generator that converts the armature AC and DC is the
Commutator
Converter
The winding that provides low voltage and high current is
In a compound generator, the setting of the setting of the amount of current in the series and shunt field windings determine the
Complexing
Compounding
Exciting
Differential
In a generator the series field diverter is also called the
Series field shunt rheostat
Series field series rheostat
Series field exciter
Shunt field exciter
Counter-torque is caused by the magnetic attraction between the field poles and the
Statot
Stator winding
Interpole
Armature reaction is the bending of the stator magnetic field by the _____ magnetic field
Interpoles
Stator windings
Series field windings are connected in series with the armature. They are wound with
Many turns large wire
Many turns small wire
Few turns large wire
Few turns small wire
The output of a shunt generator is usually controlled by the amount of
Field excitation
Input voltage
Input torque
Armature excitation current
A generator contains both series and shunt windings is called a
Self-excited generator
Separately excited generator
Complex generator
Compound generator
A generator is self-exited when
An outside source of AC is used to produce magnetism in the pole pieces
An outside source of DC is used to produce magnetism in the pole pieces
An initial voltage is produced by residual magnetism in the pole pieces
An initial voltage is produced in the series field to increase voltage
The CEC states that a generator shall be equipped with an indicating switch or circuit breaker except when
The generator is compounding
The generator is equipped with a governor
The drive means can be readily shut down and is not in parallel
The generator is arranged in parallel
When a 2 pole circuit breaker is used to protect a 3 wire DC generator, it must be installed so as to disconnect
Each armature lead
each series field winding lead
Each shunt field winding leaf
Source power
At what point in a DC generator system must the ground be attached
Individual service
On interior services
One or more supply stations
When a 4 pole circuit breaker is used to protect a 3-wire DC generator, the breaker must be connected
In parallel with the armature
That it is actuated by the entire armature current
In parallel with the shunt field
When a DC machine is cumulative compound
The series and shunt field aid each other in the production of magnetism
The series and shunt field are connected in series with each other
The series and shunt field oppose each other in the production of magnetism
The series and shunt field are connected in parallel with each other
