ICE ELECS 2 (Electronics Devices and Circuits Theory 1)

A silicon diode measures a low value of resistance with the meter leads in both positions. The trouble, if any, is

• a. the diode is open.

• b. the diode is working correctly.

• c. the diode is internally shorted.

• d. the diode is shorted to ground.

Under normal conditions a diode conducts current when it is

• a. avalanched

• b. forward-biased.

• c. saturated.

• d. reverse-biased.

As the forward current through a silicon diode increases, the internal resistance

• a. decreases.

• b. increases.

• c. remains the same.

• d. NOTA

For a forward-biased diode, the barrier potential ________ as temperature increases.

• a. increases

• b. remains constant

• c. NOTA

• d. decreases

An n-type semiconductor material

• a. has pentavalent impurity atoms added.

• b. is intrinsic.

• c. requires no doping.

• d. has trivalent impurity atoms added.

Which statement best describes an insulator?

• a. A material with few free electrons.

• b. A material doped to have some free electrons.

• c. No description fits.

• d. A material with many free electrons.

The boundary between p-type material and n-type material is called

• a. a pn junction.

• b. a diode.

• c. a reverse-biased diode

• d. a forward-biased diode.

An ideal diode presents a(n) ________ when reversed-biased and a(n) ________ when forward-biased.

• a. open, short

• b. short, short

• c. open, open

• d. short, open

What types of impurity atoms are added to increase the number of conduction-band electrons in intrinsic silicon?

• a. trivalent

• b. octavalent

• c. pentavalent

• d. bivalent

An atom is made up of

• a. all of the above

• b. electrons.

• c. protons.

• neutrons.