Discussion

Match the pair :

SET I	SET II
(a) Chopper	(i) Variable speed DC drive
(b) Dimmerstat	(ii) Variable speed AC drive
(c) Inverter	(iii) PMDC motor speed control
(d) Phase controlled rectifier	(iv) Variable AC voltage applications

Answer: C

The correct matching is a-iii, b-iv, c-ii, d-i.

A chopper converts fixed DC to variable DC, used for PMDC motor speed control (iii).
A dimmerstat (variable autotransformer) gives a variable AC voltage (iv).
An inverter produces variable-frequency AC for variable speed AC drives (ii).
A phase-controlled rectifier converts AC to variable DC for variable speed DC drives (i).

The other codes give the dimmerstat or the rectifier the wrong application, for example treating a phase-controlled rectifier as an AC drive.

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