Discussion

Match List I with List II and select the correct answer using codes given below :

List I	List II
(a) Single phase full bridge inverter	(i) step up chopper
(b) Power device combining BJT and MOSFET	(ii) free wheeling diode
(c) Device conducting during OFF period of SCR	(iii) IGBT
(d) Circuit used for converting low voltage dc to high voltage dc	(iv) can be operated in Load commutation mode

Answer: D

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

A single phase full bridge inverter feeding a suitably tuned (leading power factor) load can be commutated by the load itself (iv).
The IGBT combines a MOSFET input (voltage-controlled insulated gate) with a bipolar output stage (iii).
A free wheeling diode carries the inductive load current while the SCR is off (ii).
A step up (boost) chopper converts a low dc voltage to a higher dc voltage (i).

The other codes give the IGBT role to a diode or the boost function to the inverter, mixing up devices with circuits.

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