Power Electronics Module 1 Questions With Complete Solutions

Power Electronics Module 1 Questions With Complete
Solutions

AC-AC Converter, AC Controller (Fixed Frequency),
Cycloconverter or Frequency Converter (Variable Frequency)
Correct Answers Power Input : AC
Power Output : AC

AC-AC Converter, AC Voltage Controller Correct Answers
Converts a fixed AC source into a variable AC output voltage by
varying the conduction time or firing angle of a triac (or two
inverse-parallel
SCRs)

AC-DC Converter, Controlled Rectifier Correct Answers
Converts AC voltage into a controlled DC voltage by varying
the conduction time or firing delay angle of thyristors

AC-DC Converter, Rectifier Correct Answers Power Input :
AC
Power Output : DC

Applications of Power Electronics Correct Answers - Laptop
Computer Power Supply System
- Renewable Energy
- Electric Vehicles
- Air-Orbiting Spacecraft Power System

Applications of Power Semiconductor Devices Correct
Answers - Electric Car
- UPS

, - Motor Control
- Robot
- Washing Machine
- Air Conditioner
- Refrigerator
- VCR

Average Power of DC Current Source Correct Answers - The
average power absorbed by a DC current
source i(t)=Idc that has a periodic voltage v(t) product of the
average voltage and the current
- Pdc=Vavg*Idc

Average Power of DC Voltage Source Correct Answers -
Average power absorbed by a DC voltage source v(t)=Vdc that
has a periodic current 𝑖(𝑡)
- Pdc=Vdc*Iavg

Average Power, Real or Active Power Correct Answers - Time
average of p(t) over one or more periods
- The total average power absorbed in a circuit equals the total
average power supplied
- v(t) and i(t), and thus p(t) must be periodic

Bipolar Junction Transistors, BJTs Correct Answers - Current-
controlled device
- Terminals: collector, emitter, base
- Common-emitter configuration is usually used in switching
applications
- Hard to drive for high current applications
- Current flow in one direction only