Question 1

1. In an unbiased p-n junction, current flow is

Accepted Answer

zero, because no charges are crossing the junction

Answer

due to the diffusion of minority carriers only

Answer

zero, because equal but opposite currents are crossing the junction

Question 2

2. A germanium diode is used for.

Accepted Answer

rectification.

Answer

voltage stabilization.

Answer

modulation

Question 3

3. Why is a diode put in parallel with an LED?.

Accepted Answer

To protect it from AC.

Answer

So it will work only above a certain voltage.

Answer

So it will work only below a certain voltage.

Question 4

4. When testing the forward bias of a diode with a multimeter.

Accepted Answer

)the positive lead of the ohmmeter is placed on the anode.

Answer

)it does not matter which terminal the positive lead of the ohmeter is placed.

Answer

the positive lead of the ohmmeter is placed on the cathode.

Question 5

5  Which of the following describes the characteristics of a Thyristor?.

Accepted Answer

High current handling.

Answer

High voltage handling.

Answer

High power handling.

Question 6

6 . Light Emitting Diodes (LEDs).

Accepted Answer

emit light of only one wavelength dependent on type.

Answer

have very wide viewing angles.

Answer

)are easily damaged if forward biased b more than 5V.

Question 7

8 What does the circuit shown below do?

Accepted Answer

Half wave rectifier

Answer

Full wave rectifier

Answer

Voltage doubler

Question 8

9 This symbol is.

Accepted Answer

a diode.

Answer

)a transistor

Answer

a triac.

Question 9

10. Thermal runaway in a transistor is caused by

Accepted Answer

excessive heat causing maximum current flow

Answer

excessive heat causing minimum current flow

Answer

low heat causing minimum current flow

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