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Electrical Engineering
Semiconductor Diode
Quiz 2
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Q.1
The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ___________
1 : 1
100 : 1
1000 : 1
40000 : 1
Q.2
The most widely used rectifier is ___________
half-wave rectifier
centre-tap full-wave rectifier
bridge full-wave rectifier
none of the above
Q.3
A zener diode has ___________
one pn junction
two pn junctions
three pn junctions
none of the above
Q.4
If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is ___________
400/√2 V
400 V
400 x √2 V
none of the above
Q.5
When a crystal diode is used as a rectifier, the most important consideration is ___________
forward characteristic
doping level
reverse characteristic
PIC rating
Q.6
For the same secondary voltage, the output voltage from a centre-tap rectifier is ___________ than that of bridge rectifier
twice
thrice
four time
one-half
Q.7
The disadvantage of a half-wave rectifier is that the___________
components are expensive
diodes must have a higher power rating
output is difficult to filter
none of the above
Q.8
A zener diode has ___________ breakdown voltage
undefined
sharp
zero
none of the above
Q.9
A zener diode is always ___________ connected.
reverse
forward
either reverse or forward
none of the above
Q.10
A crystal diode is a ___________ device
non-linear
bilateral
linear
none of the above
Q.11
The PIV rating of a crystal diode is ___________ that of equivalent vacuum diode
the same as
lower than
more than
none of the above
Q.12
The PIV rating of each diode in a bridge rectifier is ___________ that of the equivalent centre-tap rectifier
one-half
the same as
twice
four times
Q.13
When the graph between current through and voltage across a device is a straight line, the device is referred to as ___________
linear
active
nonlinear
passive
Q.14
A crystal diode is used as ___________
an amplifier
a rectifier
an oscillator
a voltage regulator
Q.15
A zener diode is used as ___________
an amplifier
a voltage regulator
a rectifier
a multivibrator
Q.16
A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop.
27.5 V
86.5 V
30 V
42.5 V
Q.17
A crystal diode has
one pn junction
two pn junctions
three pn junctions
none of the above
Q.18
A 10 V power supply would use ___________ as filter capacitor.
paper capacitor
mica capacitor
electrolytic capacitor
air capacitor
Q.19
The knee voltage of a crystal diode is approximately equal to ___________
applied voltage
breakdown voltage
forward voltage
barrier potential
0 h : 0 m : 1 s
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