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.Management Sciences
Category: Regulated D.C. Power Supply
A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
A. 1 O
B. 1 O
C. 100 O
D. 10 O
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
A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?
A. More than
B. Less than
C. Equal to
D. None of the above
A Zener regulator _____________ in the power supply?
A. Increases the ripple
B. Decreases the ripple
C. Neither increases nor decreases the ripple
D. Data insufficient
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
As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?
A. Remains the same
B. Decrease
C. Increases
D. None of the above
If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?
A. Increases
B. Decreases
C. Stays the same
D. None of the above
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
Zener diode can be used as__________________?
A. c. voltage regulator only
B. c. voltage regulator only
C. both D.C and A.C voltage regulator
D. none of the above
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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