Why use a Megger instead of a Multimeter for insulation?
MEO Class 4 Electrical Oral exams primarily test a candidate's practical knowledge of shipboard electrical systems, safety protocols, and troubleshooting procedures. This guide compiles essential questions and answers derived from official Maritime and Mercantile Department (MMD) interview formats. Core Electrical Systems Meo Class 4 Electrical Oral Questions And Answers
Practical scenarios often focus on what to do when things go wrong in the engine room. What are your primary checks? Why use a Megger instead of a Multimeter for insulation
What safety measures are mandatory?
Cleaning air filters, removing dust from the rotor, checking the air gap (typically 1.5 to 2 mm) with a feeler gauge, and inspecting slip rings and carbon brushes. Safety & Regulations Core Electrical Systems Practical scenarios often focus on
Accept the alarm and isolate breakers one by one to locate the source. Common causes include damaged conductor insulation, dampness, or accumulated dirt. What tasks are performed?
Ensure proper ventilation, check oxygen content before entry, use correct PPE (rubber gloves), and strictly prohibit naked lamps or smoking due to hydrogen gas risk. How often is it tested?