Question 479Electricity/Electronics - Assistant Engineer70% to pass
While standing an "at sea watch" onboard a modern rectified DC diesel-electric drive ship you notice the transformer core temperature slowly rising. What should be your FIRST action?
AI Explanation
The correct answer is A) Check the transformer ventilation fans for proper operation.
The reasoning behind this is that a slowly rising transformer core temperature is likely due to an issue with the transformer's cooling system, such as a failure of the ventilation fans. Checking the fans should be the first action to determine if the cooling system is functioning properly and address the root cause of the temperature rise. Reducing the load or notifying the bridge to slow down (options B and D) may be necessary if the cooling issue cannot be resolved, but should not be the initial response.
Sending the oiler to look for fires (option C) is incorrect, as a slowly rising temperature does not necessarily indicate a fire hazard and could potentially divert attention from the actual issue with the cooling system.
Related Questions
#477 Refer to the simplified diagram of the AC synchronous electric motor drive system as shown in the illustration. The propulsion motor operates from maneuvering speed to full ahead speed in the ahead direction. The propulsion motor will not operate at any speed in the astern direction. What is most likely the problem? Illustration EL-0155 #478 In addition to improper brush pressure or seating, what can result in excessive sparking at the brushes of a DC propulsion motor? #480 On a vessel with turbo-electric drive, which of the following conditions would indicate that the propulsion motor had dropped out of synchronization with the propulsion generator? #481 By what means is a DC generator prevented from becoming motorized if paralleling is accomplished without an equalizer? #482 With what device is the simplest method of controlling the terminal voltage of compound wound DC generator?