Question 402Electricity/Electronics - Assistant Engineer70% to pass
As shown in the illustration of an electrically operated watertight door controller, how is reversal of the direction of motor rotation achieved? Illustration EL-0115
AI Explanation
The correct answer is C) The armature windings are reversed.
Reversing the armature windings is the typical method for reversing the direction of motor rotation in electrically operated watertight door controllers. By reversing the armature windings, the direction of the magnetic field created by the armature is flipped, causing the motor to spin in the opposite direction. This allows the watertight door to be opened and closed as needed.
The other options are incorrect because reversing the shunt field windings (A) or series field windings (B) would not directly reverse the motor rotation. Reversing both the series field and armature windings (D) would also reverse the rotation, but this is a less common approach compared to just reversing the armature windings.
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#400 Referring to the containership one-line distribution diagram shown in the illustration, what is the purpose of the transformers providing power to the refrigerated container feeder bus? Illustration EL-0014 #401 As shown in the illustration of an electrically operated watertight door controller, what type of motor is used to open and close the watertight door? Illustration EL-0115 #403 As shown in the illustration of an electrically operated watertight door controller, how is the motor stopped automatically when the door is wedged open? Illustration EL-0115 #404 By what means is the burning of controller contacts due to arcing, when opening, prevented? #405 As shown in the illustration of an electrically operated watertight door controller, how is the motor stopped automatically when the door is wedged closed? Illustration EL-0115