Engine Electrical Final Exam Practice
Test.
What device is used to convert alternating current, which has been induced into the loops of the
rotating armature of a dc generator, to direct current? - CORRECT ANSWER 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 - CORRECT
ANSWER the condition is normal for this type of motor.
The stationary field strength in a direct current generator is varied - CORRECT ANSWER according to the
load requirements.
What type of electric motor is generally used with a direct-cranking engine starter? - CORRECT ANSWER
Direct current, series-wound motor.
Upon what does the output frequency of an ac generator (alternator) depend? - CORRECT ANSWER 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, - CORRECT ANSWER 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 - CORRECT ANSWER hertz output.
What is used to polish commutators or slip rings? - CORRECT ANSWER Very fine sandpaper.
If a generator is malfunctioning, its voltage can be reduced to residual by actuating the - CORRECT
ANSWER generator master switch.
Test.
What device is used to convert alternating current, which has been induced into the loops of the
rotating armature of a dc generator, to direct current? - CORRECT ANSWER 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 - CORRECT
ANSWER the condition is normal for this type of motor.
The stationary field strength in a direct current generator is varied - CORRECT ANSWER according to the
load requirements.
What type of electric motor is generally used with a direct-cranking engine starter? - CORRECT ANSWER
Direct current, series-wound motor.
Upon what does the output frequency of an ac generator (alternator) depend? - CORRECT ANSWER 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, - CORRECT ANSWER 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 - CORRECT ANSWER hertz output.
What is used to polish commutators or slip rings? - CORRECT ANSWER Very fine sandpaper.
If a generator is malfunctioning, its voltage can be reduced to residual by actuating the - CORRECT
ANSWER generator master switch.
