electronics

Question 1

Transformer utilization factor of a center tapped full wave rectifier is ___________

Answer 1

0.693

Question 2

If the peak voltage on a center tapped full wave rectifier circuit is 5v and diode cut in voltage is 0.7. The peak inverse voltage on diode is_______________

Answer 2

For a rectifier, PIV = 2Vm – Vd = 10 – 0.7= 9.3V.

Question 3

Which of the following is applicable in respect to a P-N junction diode, which is not connected to any circuit?

Answer 3

There is an electric field at the junction directed from N-type side to P-type side

Question 4

For a half wave or full wave rectifier the peak inverse voltage of the rectifier is always

Answer 4

The peak input voltage is smaller than the input voltage due to the presence of diodes. A single diode reduces the output voltage by approximately 0.7V.

Question 5

A diode characteristic curve is a graph between:

Answer 5

voltage and current

Question 6

In a bridge full wave rectifier, the input sine wave is 100pi. The output ripple frequency will be:

Answer 6

ω = 100π ⇒ 2πf = 100π ⇒ f = 50Hz
In full wave rectification
Pulse frequency (ripple frequency) = 2 × Frequency of source = 2 × 50Hz = 100Hz

Question 7

in an unbiased pn junction

Answer 7

the diffusion and drift currents cancel each other

Question 8

the process by which the potential battier of the depletion region can be increased or decreased is called

Answer 8

biasing
(width decreases for forward)

Question 9

knee potentials of Ge vs Si

Answer 9

Ge : 0.3
Si : 0.7

Question 10

the circuit which is built of silicon chip, transistor and capacitor is called

Answer 10

amplifier circuit