Correct Answer : Option (C) : variable ac with fixed frequency is obtained
Explanation : Voltage controllers convert the fixed ac voltage to variable ac by changing the values of the firing angle. The available ac obtained has the same fixed frequency as the input ac.
Correct Answer : both inverter and rectifier
Explanation : Rectifier to converter the dc from the battery to ac. Inverter to charge the battery from mains.
Correct Answer : smaller conductor size
Explanation : The conductor size is smaller as there is no sink effect, and the whole conductor is utilized for transmitting power.
Correct Answer : Chopper
Explanation : SMPS (Switching mode power supply) are based on the chopper principle. The output dc voltage is controlled by varying the duty cycle of the chopper circuit.