Diodes and Transistors

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

reverse-biased

forward-biased

close coupled

enhanced

If alternating current is applied to the anode of a diode, what would you expect to see at the cathode?

Pulsating direct current

No signal

Pulsating alternating current

Steady direct current

The average value of a half-wave rectified voltage with a peak value of 200 V is

127.3 V

141 V

0 V

63.7 V

Although current is blocked in reverse bias

there is very small current due to minority carriers

there is an avalanche current

there is some current due to majority carriers

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

A light-emitting diode

A neon bulb

A vacuum diode

A fluorescent bulb

If you wish to reduce the current flowing in a field effect transistor, you could:

increase the forward bias voltage

increase the forward bias gain

increase the reverse bias voltage

decrease the reverse bias voltage

JFET is a

Voltage controlled device with high input resistance

Voltage Controlled Voltage Source (VCVS)

Current Controlled Current Source (CCCS

Current controlled device with high input resistance

The two basic types of bipolar transistors are:

diode and triode types

varicap and zener types

P and N channel types

NPN and PNP types

Zener diodes are most commonly used in:

oscillator circuits

voltage amplifier circuits

current limiting circuits.

power supply circuits

When a 60 Hz sinusoidal voltage is applied to the input of a full-wave rectifier, the output frequency is

120 Hz

60 Hz

30 Hz

75 Hz

The approximate voltage across the forward-biased base emitter junction of a silicon BJT is

0 V

0.4 V

0.3 V

0.7 V

Voltage regulation is the principal application of the:

light-emitting diode

vacuum diode

Zener diode

junction diode

Compared to bipolar transistor, a JFET has

higher input impedance and low voltage gain

higher voltage gain

higher input impedance and high voltage gain

lower input impedance

A semiconductor is described as a "general purpose audio NPN device". This would be:

a triode

a bipolar transistor

an audio detector

a silicon diode

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

117 Hz

125 V

100 V

62.5 V

A transistor can be destroyed in a circuit by:

saturation

cut-off

excessive light

excessive heat

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

low power consumption

low input impedance

high input impedance

a reverse-biased PN junction

The positive lead of an ohmmeter is connected to the anode of a diode and the negative lead is connected to the cathode. The diode is

faulty

reverse-biased

open

Forward-biased

For a silicon diode, the value of the forward-bias voltage typically

depends on the width of the depletion region

must be greater than 0.7 V

depends on the concentration of majority carriers

must be greater than 0.3 V

A semiconductor having its leads labeled gate, drain, and source is best described as a:

bipolar transistor

silicon diode

gated transistor

field-effect transistor

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