Class 2 (2nd Engineer) MET 📅 Oct 2019

Exam Question

With reference to transformer answer following:

(a) Explain the construction of a lighting transformer used onboard.

(b) What is all day efficiency of a transformer?

(d) In a short-circuit test performed on a transformer iron losses are negligible, why?

Reference Answer

(a) Construction of a Lighting Transformer Used Onboard
A lighting transformer used onboard is generally a step-down transformer designed to reduce the ship’s main switchboard voltage (typically 440 V) to safer lighting voltages such as 220 V or 110 V. It consists of:
Laminated iron core made from thin insulated sheets to reduce eddy current losses.
Primary and secondary windings , wound cylindrically and insulated using materials such as varnished paper, cloth, or other dielectric materials.

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