1.Power electronics are based on chose
a.switching devices like diode
b.materials
c,logic gates
e.software systems
f.others

2The main disadvantage of ac voltage controllers is the introduction of chose .
a.objectionable harmonics
b.Heat
c.Wet
f.High eddy currents
e.others



3.Power diodes are ?chose
a.Power diodes are controlled devices
b.Power diodes are uncontrolled devices
c.Power diodes are non-semiconductor devices
d.converters
f.othes