Power Electronics Questions

• A single phase half bridge inverter required to feed R-L loads needs
• When a dc chopper feeds an RLE load, the load current, during steady state operation
• In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
• Which of the following devices has metal-silicon junction?
• The main utility of SCR is due to
• Assertion (A): A half wave controlled rectifier has poorer efficiency and higher ripple factor than a full wave controlled rectifier. Reason (R): The use of a freewheeling diode in half wave controlled rectifier circuit improves the waveform of load current and circuit power factor.
• A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be
• The efficiency of a chopper circuit is about
• Which of these devices can conduct in both directions?
• Mc Murray full bridge inverter uses
• If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is
• In rectifier circuits, the rms value of ac component of output voltage is equal to
• Half bridge and full bridge inverters of one type use different commutation methods.
• In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is
• Two thyristors of the same rating and specifications
• In rectifier circuits, ripple factor RF and form factor FF are related as
• A chopper is a high efficiency circuit.
• In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is
• A single phase half wave rectifier is feeding a resistive load. As firing angle is increased
• Thyristors connected in series need static and dynamic stabilizing circuits.