If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ___________ biased.
A. forward
B. reverse
C. either forward or reverse
D. none of the above
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In the breakdown region, a zener didoe behaves like a ___________ source.
A. constant voltage
B. constant current
C. constant resistance
D. none of the above
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When the crystal current diode current is large, the bias is ___________
A. forward
B. inverse
C. poor
D. reverse
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If the temperature of a crystal diode increases, then leakage current ___________
A. remains the same
B. decreases
C. increases
D. becomes zero
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The d.c. resistance of a crystal diode is ___________ its a.c. resistance
A. the same as
B. more than
C. less than
D. none of the above
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For the same secondary voltage, the output voltage from a centre-tap rectifier is ___________ than that of bridge rectifier
A. twice
B. thrice
C. four time
D. one-half
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The disadvantage of a half-wave rectifier is that the___________
A. components are expensive
B. diodes must have a higher power rating
C. output is difficult to filter
D. none of the above
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A crystal diode is used as ___________
A. an amplifier
B. a rectifier
C. an oscillator
D. a voltage regulator
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A zener diode is used as ___________
A. an amplifier
B. a voltage regulator
C. a rectifier
D. a multivibrator
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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.
A. 27.5 V
B. 86.5 V
C. 30 V
D. 42.5 V
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A zener diode has ___________ breakdown voltage
A. undefined
B. sharp
C. zero
D. none of the above
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A zener diode is always ___________ connected.
A. reverse
B. forward
C. either reverse or forward
D. none of the above
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A crystal diode is a ___________ device
A. non-linear
B. bilateral
C. linear
D. none of the above
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A crystal diode has
A. one pn junction
B. two pn junctions
C. three pn junctions
D. none of the above
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A 10 V power supply would use ___________ as filter capacitor.
A. paper capacitor
B. mica capacitor
C. electrolytic capacitor
D. air capacitor
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If the a.c. input to a half-wave rectifier is an r.m.s value of
2 400 volts, then diode PIV rating is ___________
A. B. 400 V
C. D. None of the above
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When a crystal diode is used as a rectifier, the most important consideration is ___________
A. forward characteristic
B. doping level
C. reverse characteristic
D. PIC rating
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The PIV rating of each diode in a bridge rectifier is ___________ that of the equivalent centre-tap rectifier
A. one-half
B. the same as
C. twice
D. four times
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When the graph between current through and voltage across a device is a straight line, the device is referred to as ___________
A. linear
B. active
C. nonlinear
D. passive
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The knee voltage of a crystal diode is approximately equal to ___________
A. applied voltage
B. breakdown voltage
C. forward voltage
D. barrier potential
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