Power Electronics Questions

• Assertion (A): The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fired. Reason (R): A thyristor can conduct only when it is forward biased.
• The effect of source inductance in a 3 phase fully controlled bridge converter is to
• Class A and class B chopper
• In a modified series inverter
• A single phase cycloconverter with centre tapped input transformer requires
• A class B chopper operates in third quadrant.
• The duty cycle of a step down chopper is
• When an SCR is reverse biased
• From which instant is the turn off time of a thyristor defined
• The number of thyristors in a single phase fully controlled bridge rectifier is
• In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are
• The snubber circuit consists of
• In a dual converter operated in circulating current mode, the circulating current flows
• Assertion (A): Light triggering is very suitable for HVDC transmission. Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.
• In Jone chopper, the commutating element
• The total number of leads in SCR, DIAC and TRIAC respectively are
• Forward rating of an SCR is
• The load circuit of a single phase full bridge inverter
• When a single phase dual converter is operating in circulating current mode
• In disc mounting of SCR