Types of Diodes

Zener diodes are used primarily as

• amplifiers

• voltage regulators

• rectifiers

• oscillators

A pn junction that radiates energy as light instead of as heat is called a

• LED

• photo-diode

• photocell

• Zener diode

The capacitance of a varactor diode increases when reverse voltage across it

• decreases

• increases

• breaks down

• stores charge

To display the digit 8 in a seven-segmentindicator

• C must be lighted

• G must be off

• F must be on

• All segments must be lighted

A photo-diode is normally

• forward-biased

• reverse-biased

• Neither forward nor reverse biased

• Emitting light

When the reverse voltage increases, the junction capacitance

• decreases

• stays the same

• increases

• has more bandwidth

The device associated with voltage-controlled capacitance is a

• LED

• photo-diode

• varactor diode

• Zener diode

The varactor is usually

• forward-biased

• reverse-biased

• unbiased

• in the breakdown region

When the light increases, the reverse current in a photo-diode

• increases

• decreases

• is unaffected

• none of the answers

To display the digit 0 in a seven segment display

• A must be lighted

• F must be off

• G must be on

• all segments except G should be lighted