Related Mcqs:

1. 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

2. The leakage current in a crystal diode is due to _________________?

   A. minority carriers
   B. majority carriers
   C. junction capacitance
   D. none of the above

3. The reverse current in a diode is of the order of _____________?

   A. kA
   B. mA
   C. μA
   D. A

4. The forward voltage drop across a silicon diode is about _______________?

   A. 2.5 V
   B. 3 V
   C. 10 V
   D. 0.7 V

5. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ______________?

   A. 1 : 1
   B. 100 : 1
   C. 1000 : 1
   D. 40,000 : 1

6. If the doping level of a crystal diode is increased, the breakdown voltage__________________?

   A. remains the same
   B. is increased
   C. is decreased
   D. none of the above

7. 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

8. If the PIV rating of a diode is exceeded,_______________?

   A. the diode conducts poorly
   B. the diode is destroyed
   C. the diode behaves like a zener diode
   D. none of the above

9. A series resistance is connected in the zener circuit to_______________?

   A. properly reverse bias the zener
   B. protect the zener
   C. properly forward bias the zener
   D. none of the above

10. 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__________________?

    A. 400/√2 V
    B. 400 V
    C. 400 x √2 V
    D. none of the above