DIODE

When a diode is forward-biased, the anode voltage

• is negative relative to the cathode voltage

• is positive relative to the cathode voltage

• is the same as the cathode voltage

• alternates between positive and negative relative to the cathode voltage

If a diode is connected in series with the secondary winding of an ac transformer, and if the peak voltage across the diode never exceeds the avalanche voltage, then the output of the complete transformer-diode circuit is

• ac with half the frequency of the input

• ac with the same frequency as the input

• ac with twice the frequency of the input

• none of the above

A crystal set

• can be used to transmit radio signals

• requires a battery with long life

• requires no battery

• is used for rectifying 60-Hz ac

A diode detector

• is used in power supplies

• is employed in some radio receivers

• is used to generate microwave RF signals

• changes dc into ac

If the output wave in a circuit has the same shape as the input wave, then

• the circuit is operating in a linear manner

• the circuit is operating as a frequency multiplier

• the circuit is operating as a mixer

• the circuit is operating as a rectifier

Suppose the two input signal frequencies to a mixer circuit are 3.522 MHz and 3.977 MHz. At which of the following frequencies can we expect a signal to exist at the output?

• 455 kHz

• 886 kHz

• 14.00 MHZ

• 1.129 MHz

Fill in the blanks to make the following sentence correct: "A spectrum analyzer provides a display of as a function of."

• amplitude/time

• time/frequency

• frequency/time

• amplitude/ frequency

Zener voltage is a specialized manifestation of

• forward breakover voltage

• peak forward voltage

• avalanche voltage

• reverse bias

The forward breakover voltage of a silicon diode is

• about 0.3V

• about 0.6V

• about 1.0V

• dependent on the avalanche voltage

A diode audio limiter circuit

• is useful for voltage regulation

• always uses Zener diodes

• rectifies the audio to reduce distortion

• can cause distortion under some conditions