Power Electronics Viva Questions and Answers
[1] What are the advantages and disadvantages of Flyback converter?
Advantages:
(1) No inductor is required at the output which is compulsory is the other converters topology.
(2) Number of components are less.
Disadvantages:
(1) Useful for low power applications(50W to 100W)
(2) Output load is compulsory otherwise output capacitance may get overcharge.
[2] What is meant by Constant Current Source?
A voltage source that has a very high internal impedance as compared with external load impedance is considered as a Constant Current Source( the source which can provide constant current to the load).
[3] What is the difference between silicon diode and germanium diode?
- Generally Silicon diodes have higher PIV (Peak Inverse Voltage) and current rating than germanium diodes.
- Peak Inverse Voltage (PIV) ratings
for silicon diodes is nearly 1000 V, whereas
for germanium diodes is maximum 400 V only. - Silicon diodes can work in wider temperature ranges. Temperature range
for Silicon diodes is about 200°C, whereas
for germanium diodes is maximum 100°C. - The disadvantage of silicon diode is the higher knee voltage (forward-bias voltage required to reach the region of upward swing). Typically the knee voltage
for Silicon diodes is 0.7V, whereas
for germanium diodes is 0.3V.
[4] What is the difference between Resistor, Rheostat and Potential Divider?
Resistor:
A fixed resistor connected permanently in the circuit for the purpose of limiting the current is called as resistor.
Rheostat:
A variable resistance with a sliding contact is known as rheostat. The current flowing through the circuit is restricted by inserting and varying the resistance with the help of the sliding contact.
Potential divider:
When a resistance is used to develop a voltage drop, it is called as a potential divider.
[5] What are the characteristics of ideal Opamp?
- Infinite open loop voltage gain
- Infinite input impedance
- Zero output impedance
- Infinite Bandwidth
- Zero offset voltage
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