1) 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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2) As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________? a. Is increased b. Is decreased c. Remains the same d. None of the above
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3) 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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4) 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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5) In an unregulated power supply, if load current increases, the output voltage _____________? a. Remains the same b. Decreases c. Increases d. None of the above
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6) Commercial power supplies have voltage regulation ______________? a. of 10% b. of 15% c. of 25% d. within 1%
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7) A power supply which has voltage regulation of ____________ is unregulated power supply? a. 0 % b. 5 % c. 10 % d. 8%
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8) An ideal regulated power supply is one which has voltage regulation of________________? a. 0% b. 5% c. 10% d. 1%
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9) The rupture of co-valent bonds will occur when the electric field is__________________? a. 100 V/cm b. 6 V/cm c. 1000 V/cm d. More than 105 V/cm
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10) Zener diode can be used as__________________? a. ac. voltage regulator only b. dc. voltage regulator only c. both D.C and A.C voltage regulator d. none of the above
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