Question 395Electricity/Electronics - QMED70% to pass
According to the sample sheet of a typical "List of Motors and Controls" as shown in the illustration, which of the following motor applications features a means of keeping the motor windings warm and dry when the motor is idle? Illustration EL-0204
AI Explanation
The correct answer is D) Amidships mooring winch.
The reason this is the correct answer is that mooring winches on ships often have a means of keeping the motor windings warm and dry when the motor is idle. This is done to prevent moisture buildup and condensation, which can damage the windings. Maintaining the windings in a warm, dry state helps ensure the motor is ready for immediate use when needed for mooring operations.
The other options, such as the main engine sea water cooling pump, main fuel oil transfer pump, and main engine piston cooling water pump, do not typically require this type of winding heating/drying feature, as they are not subject to long periods of inactivity like the mooring winch motor.
Related Questions
#393 In general, what type of starter would be used to connect polyphase induction motors to full line voltage at the instant of start-up? #394 Autotransformer starters, sometimes called starting compensators, are sometimes used with larger polyphase induction motors. What function do they perform? #396 The progressive operation of the contactors marked "1A" through "4A" provide the winch hoist controller shown in the illustration with what functionality? Illustration EL-0102 #397 In the event of a power failure during cargo loading operations, the movement of an electric powered cargo winch will be stopped by what means? #398 As shown in the illustration, what is the functional purpose of the normally closed and normally open auxiliary contacts of the hoist and lower contactors respectively? Illustration EL-0102