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Home Question Bank Engineering Archive 2024 December 07

Engineering Questions from Dec 07,2024

Browse the Engineering Q&A Archive for Dec 07,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Question 4 ( 5 marks) (a) Explain the function of the 30 mA RCCB commonly found in the Distribution Boards (DBs) in households. (b) State ONE function of the voltmeter installed at the outgoing circuit of a consumer main distribution board. (c) Explain the difference between a Live-Earth short circuit and an earth leakage curren QUESTION 2 (12 marks) A single-story factory has a 1.5 MVA, 22kVIASV, ONAN, DYN11 distribution transformer to provide electricity for the factory. (i) Calculate the current supplying to the factory (12 marks) single-story factory has a 1.5 MVA, 22kVI45V, ONAN, DYN11 distribution transform provide electricity for the factory. Calculate the current supplying to the factory i) Explain why it is a good choice to use this transformer for this factory (ii) Sketch an annotated showing the windings configuration and voltages for the transformer. Question 3 (10 marks) (a) State the full description of the abbreviation 'RCCB', which is commonly found in A distribution transformer for a building is specified as 6.6 kV/415 V, 2 MVA, ONAN, DYN11. (a) Explain the term ONAN. (b) State two (2) physical differences between this transformer and an ANAF transformer. (c) Calculate the current flow in the load side of this transformer when the load of [4] 1500 kVA is connected to it? (d) What is the greatest risk associated with this transformer installing in a building? [1] The minimum clearance required between side wall and the Main Switchboard is The minimum clearance required between side wall and the Main Switchboard is Most low voltage switchboards in Singapore need to be by undergo a series of stringent tests performed by an independent third party laboratory. UESTION 2 distribution transformer for a building is specified as 6.6 kVI415 V, 2 MVA, ONAN, YN11. Explain the term ONAN.
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