A Zener diode ___________
A. Is a battery
B. Acts like a battery in the breakdown region
C. Has a barrier potential of 1 V
D. Is forward biased
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The rupture of covalent bonds will occur when the electric field is ___________.
A. 100 V/cm
B. 0.6 V/cm
C. 1000 V/cm
D. More than 105 V/cm
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What is true about the breakdown voltage in a Zener diode?
A. It decreases when load current increases
B. It destroys the diode
C. It equals current times the resistance
D. It is approximately constant
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A Zener diode is used as a ___________ voltage regulating device
A. Shunt
B. Series
C. Series-shunt
D. None of the above
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A power supply which has voltage regulation of ___________ is unregulated power supply
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Commercial power supplies have voltage regulation ___________
A. of 10%
B. of 15%
C. of 25%
D. within 1%
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If the doping level is increased, the breakdown voltage of the Zener ___________
A. Remains the same
B. Is increased
C. Is decreased
D. None of the above
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Another name for Zener diode is ___________ diode
A. Breakdown
B. Voltage
C. Power
D. Current
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The current in a Zener diode is limited by ___________
A. External resistance
B. Power dissipation
C. Both (A) and (B)
D. None of the above
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The Zener current will be minimum when ___________
A. Load current is maximum
B. Load current is minimum
C. Load current is zero
D. None of the above
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Which of these is the best description for a Zener diode?
A. It is a diode
B. It is a constant current device
C. It is a constant-voltage device
D. It works in the forward region
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In a 15 V Zener diode , the breakdown mechanism will occur by ___________
A. Avalanche mechanism
B. Zener mechanism
C. Both Zener and avalanche mechanism
D. None of the above
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A Zener diode utilises ___________ characteristic for voltage regulation
A. Forward
B. Reverse
C. Both forward and reverse
D. None of the above
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In a loaded Zener regulator, which is the largest Zener current?
A. Series current
B. Zener current
C. Load current
D. None of the above
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A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?
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A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation?
A. 3.09
B. 2.87
C. 5.72
D. None of the above
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In an unregulated power supply, if input a.c. voltage increases, the output voltage .
A. Increases
B. Decreases
C. Remains the same
D. None of the above
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