MCQs on Analog Electronics

Page 17 of 33. Go to page
01․ In a JFET, the primary control on drain electric current is exerted by
channel resistance.
size of depletion regions.
voltage drop across channel.
gate reverse bias.

Under construction.
02․ Which of following is the point of reference JFET?
Drain.
Gate.
Source.
None of above.

Under construction.
03․ The gate controls
the width of the channel.
the drain current.
the gate voltage.
all of them.

Under construction.
04․ Which of following is not an essential element of a DC power supply?
Rectifier.
Voltage regulator.
Filter.
Voltage amplifier.

Under construction.
05․ What is true about the breakdown voltage in a zener diode?
It decreases when electric current increases.
It destroys the diode.
It equals the electric current times the resistance.
It is approximately constant.

Under construction.
06․ Which of these is the best description of a zener diode?
It is a rectifier diode.
It is a constant voltage device.
It is a constant electric current device.
It works in the forward region.

Under construction.
07․ A zener diode
is a battery.
has a constant voltage in the breakdown region.
has a barrier potential of 1 V.
is forward biased.

Under construction.
08․ The voltage across the zener resistance is usually
small.
large.
measured in volts.
subtracted from the breakdown voltage.

Under construction.
09․ If the series resistance increases in an unloaded zener regulator, the zener current
decreases.
stays the same.
increases.
equals the voltage divided by the resistance.

Under construction.
10․ In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the
source.
series resistor.
zener resistance.
zener diode.

Under construction.
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