Power Electronics - Online Test

Q1. Transformer and emitter follower can both be used for impedance matching at the output of an audio amplifier. The basic relationship between the input power Pin and output power Pout in both the cases is
Answer : Option A
Explaination / Solution:
No Explaination.


Q2. The electron and hole concentrations in an intrinsic semiconductor are ni per cm3 at 300 K. Now, if acceptor impurities are introduced with a concentration of NA per cm3 (where N>> ni , the electron concentration per cm3 at 300 K will be
Answer : Option D
Explaination / Solution:

As per mass action law
np = ni
If acceptor impurities are introduces


Q3. In a p n junction diode under reverse biased the magnitude of electric field is maximum at
Answer : Option C
Explaination / Solution:

The electric field has the maximum value at the junction of p n.

Q4. The correct full wave rectifier circuit is
Answer : Option C
Explaination / Solution: