Question 516Electricity/Electronics - QMED70% to pass
Upon failure of the ships normal electrical power supply, by means of what device does the emergency generator supply power to the emergency switchboard, but not the main switchboard?
AI Explanation
The correct answer is C) automatic bus transfer switch.
When the ship's normal electrical power supply fails, the emergency generator is designed to automatically supply power to the emergency switchboard through an automatic bus transfer switch. This switch is responsible for detecting the loss of normal power and then seamlessly transferring the power supply to the emergency generator, without the main switchboard being affected. This ensures that critical systems, such as emergency lighting and navigation equipment, continue to function even in the event of a main power failure.
The other options are incorrect because: A) the power failure alarm bus is not responsible for the power transfer, B) the main lighting transformer is not involved in the emergency power supply, and D) the main switchboard bus is not the pathway for the emergency generator's power supply.
Related Questions
#514 By what means is a diesel-driven emergency generator prevented from being paralleled with the ship's service generators? #515 A DC generator which is used to supply direct current in order to provide magnetizing current to an AC generator field is commonly known as what? #517 When would be the safest time to close the ship's main switchboard "shore power" circuit breaker? #518 With what device is the RPM of an AC generator indirectly measured on a switchboard when operating singly (no other generator connected to the bus)? #519 The turns ratio of the step-down transformer with dual voltage secondary as shown in figure "B" of the illustration is two to one (total). If 440 volts were applied to terminals 'H1' and 'H2', what would be measured across 'X1-X3' and 'X2-X4' assuming that the secondary windings are connected in parallel? Illustration EL-0082