16) In which type of AC to DC converter losses are less and efficiency is higher ?

17) Before installing a motor a proper foundation has to be provided. Where foundation bolts are embedded in concrete, their location must be determined with great accuracy. Location of foundation bolts correctly in position can be done by

18) One of the diodes of a bridge rectifier connected to 100 V 50 Hz AC input is found to be damaged. The DC output of the circuit is 90 V. The minimum value of PIV of the diode required for replacement is

19) In a full wave rectifier one of the damaged diodes is replaced by a diode of PIV equal to input AC voltage. The newly replaced diode in the circuit

20) A 500 mA, 12 V eliminator power has bridge rectifier. The P.W. rating of diode is