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EWRB EXAM QUESTIONS AND ANSWERS PREPARATION TEST (already passed!!) A+ GRADED State TWO types of electrical protection provided by a RCBO. - ANSWER ANY TWO: - Earth Leakage - Overload - Short Circuit If the voltage and current are known, what TWO other factors are required to calculate the power consumed by a three-phase motor? - ANSWER √3 & Power Factor What type of single-phase motor can be reversed by reversing the connections to the run winding? - ANSWER AN...

Ewrb Theory Exam Prep Questions With Correct Detailed Answers 2024|2025

Types of MCB trips thermal Magnetic Thermal tripping bi-metal strip, used for overload currents protection Magnetic tripping magnetic inductor, used for short circuit protection Reset procedure reset to OFF Reset to ON Arc containment includes horns carry current to chute, allow arc to jump out Arc chute lengthens distance for arc to travel Oil suppresses arc Splitter plates split the arc Arc control factors reduced horns width minimize arc x section More plates split arc into multiple smal...

A new flexible chord has been fitted, which of the following insolation resistance test values would be correct? A. 10 MOhm B. 0.5 Ohm C. 0.5 MOhm D. 1. Ohm A. 10 MOhm Question 2: The maximum current a flexible cord can carry safely without overheating depends mainly on: A. The type of supply, a.c. or d.c. B. The cross-sectional area of the flexible cord conductors. C. The colours of the flexible cord conductors. D. The number of cores in the flexible cord. B. The cross-sectional area of the ...

What is the minimum value of the permitted test result for the insulation resistance test of a three-phase, 400V, mains cable? 1MΩ When carrying out testing on a low voltage electrical installation, which document details the tests and checks required to be carried out? AS/NZS 3000 What is the minimum or maximum test result value you would consider acceptable for an Earth Continuity test? 1Ω or less State TWO types of electrical protection provided by a RCBO. ANY TWO: - Earth Leakage - Over...

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