Question 5Electricity/Electronics - 1st Asst/Chief70% to pass
What statement is true concerning temporary protective grounds used to establish an equipotential zone for the purposes of eliminating the electric shock hazard?
AI Explanation
The correct answer is D) A shock hazard exists when there is a difference in potential between conductors or a conductor and hull ground.
This is correct because a shock hazard can only occur when there is a difference in electrical potential between two conductive points. Temporary protective grounds are used to establish an equipotential zone, meaning all conductive surfaces are at the same electrical potential, eliminating any potential difference and thus the shock hazard.
The other options are incorrect because A) and B) state that a shock hazard only exists in specific situations, when in fact a potential difference between any two conductive points can create a shock hazard. Option C) is incorrect because an equipotential zone eliminates the shock hazard, not creates it.
Related Questions
#3 In the twin screw diesel-electric AC propulsion system shown in the illustration, what type of propulsion motors is used? Illustration EL-0164 #4 Referring to the illustration of a twin-screw diesel-electric AC propulsion drive system, if either the port propulsion excitation transformer or the port propulsion field controller was inoperable, what statement is true? Illustration EL-0164 #6 Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out? #7 For the purposes of safety and determining the shock hazard, nominal voltage is defined as the normal electrical system design voltage. This can be determined from what is displayed on nameplates, dataplates, schematics, or single-line diagrams. What does the nominal voltage represent? #8 When performing an absence-of-voltage test, a live-dead-live test may be required in conjunction with the absence-of-voltage test. What is the purpose of the live-dead-live test?