Electrical Flashcards
What device is used to covert alternating current, which has been induced into the loops of the rotating armature of a DC generator, to direct current?
A commutator
A certain direct current series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. The most logical conclusion that may be drawn is….
The condition is normal for this type of motor
The stationary field strength in a direct current generator is varied…
According to the load requirements
What type of electric motor is generally used with a direct-cranking engine starter?
Direct current series-wound motor
Upon what does the output frequency of an AC generator (alternator) depend?
The speed of rotation and the number of field poles.
A high surge of current is required when a DC electric motor is first started. As the speed of the motor increases…
The counter EMF builds up and opposes the applied EMF, thus reducing the current flow through the armature.
Alternators (AC generators) that are driven by a constant-speed drive(CSD) mechanism are used to regulate the alternator to a constant…
Hertz output
What is used to polish commutators or slip rings?
Double zero sandpaper
If a generator is malfunctioning, its voltage can be reduced to residual by actuating the
Generator master switch
If the points in a vibratory -type voltage regulator stick in the closed position while the generator is operating, what will be the probable result?
Generator output voltage will increase.
Why is a constant-speed drive used to control the speed of some aircraft engine- driven generators?
So that the frequency of the alternating current output will remain constant.
According to the electron theory of the flow of electricity, when a properly functioning DC alternator and volt-
age regulating system is charging an aircraft’s battery, the direction of current flow through the battery…
Is into the negative terminal and out the positive terminal
Aircraft that operate more than one generator connected to a common electrical system must be provided with…
Individual generator switches that can be operated from the cockpit during flight.
The most effective method of regulating aircraft direct current generator output is to vary, according to the load requirements, the…
Strength of the stationary field
Electric motors are often classified according to the method of connecting the field coils and armature, Aircraft engine starter motors are generally of which type?
Series
