DieselShip's Online Content Library

Q6) (a) With reference to a single-phase autotransformer:

(i) sketch a labelled diagram; (3)

(ii) describe how this autotransformer is different to an ordinary power transformer; (3)

(iii) state FOUR advantages compared to an ordinary power transformer; (4)

(iv) state ONE shipboard application of an autotransformer. (1)

(b) An autotransformer is used to supply a single-phase, 230 V, 2 kW, unity power factor load from a 400 V supply. Calculate EACH of the following, neglecting losses:

(i) the current in the turns not connected across the load; (4)

(ii) the current in the turns connected across the load. (1)