Diodes and Transistors

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When the rms output voltage of a bridge full wave rectifier is 20 V, the peak inverse voltage across the diodes is (neglecting the diode drop)

20 V

28.3 V

56.6 V

40 V

None

The depletion region in a Junction Diode contains

only charge carriers (of minority type and majority type)

no charge at all

only ions i.e., immobile charges

vacuum, and no atoms at all

None

In a bipolar transistor, the _____________compares closest to the control grid of a triode vacuum tube.

collector

source

emitter

base

None

Compared to bipolar transistors, field effect transistors are NOT normally characterized by:

a reverse-biased PN junction

low input impedance

high input impedance

low power consumption

None

If a low level signal is placed at the input to a transistor, a higher level of signal is produced at the output lead. This effect is know as:

amplification

detection

rectification

modulation

None

Bipolar transistors usually have:

4 leads

1 lead

2 leads

3 leads

None

Pinch-off voltage VP for an FET is the drain voltage at which

all free charges get removed from the channel

drain current becomes zero

avalanche break down takes place

significant drain current starts flowing

None

A varactor diode exhibits

a constant capacitance over a range of reverse voltages

a variable capacitance that depends on forward current

a variable resistance that depends on reverse voltage

a variable capacitance that depends on reverse voltage

None

A transistor in common emitter mode has

a very low input resistance and a low output resistance

a high input resistance and low output resistance

a high input resistance and a high output resistance

a medium input resistance and high output resistance

None

One important application for diodes is recovering information from transmitted signals. This is referred to as:

regeneration

demodulation

biasing

ionization

None

Which configuration has unity voltage gain (ideal)

a Common Base (CB)

a Common Collector (CC)

a Common Emitter (CE

CE followed by CB

None

In order for a diode to conduct, it must be:

enhanced

close coupled

forward-biased

reverse-biased

None

For operation as an amplifier, the base of a npn transistor must be

negative with respect to the emitter

0 V

positive with respect to the emitter

positive with respect to the collector

None

A certain power supply filter produces an output with a ripple of 100 mV peak-to-peak and a dc value of 20 V. The ripple factor is

0.05

0.02

0.005

0.00005

None

The total secondary voltage in a center-tapped full-wave rectifier is 125 rms. Neglecting the diode drop, the rms output voltage is

100 V

125 V

117 Hz

62.5 V

None

Avalanche breakdown results basically due to

rise in temperature

emission of electrons

strong electric field across the junction

impact ionisation

None

If the load resistance of a capacitor-filtered full-wave rectifier is reduced, the ripple voltage

has a different frequency

decreases

is not affected

increases

None

For a certain 12 V zener diode, a 10 mA change in zener current produces a 0.1 V change in zener voltage. The zener impedance for this current ranges is

0.1 Ω

10 Ω

100 Ω

1 Ω

None

What semiconductor device glows red, yellow, or green, depending upon its chemical composition?

A light-emitting diode

A fluorescent bulb

A vacuum diode

A neon bulb

None

The varactor diode is usually

Unbiased

reverse biased

holes and electronics

Forward biased

None

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