A. choke input
B. capacitor input
C. resistance input
D. none of the above
Semiconductor Diode
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
A zener diode is used as ______________?
A. an amplifier
B. a voltage regulator
C. a rectifier
D. a multivibrator
A zener diode has ________________?
A. one pn junction
B. two pn junctions
C. three pn junctions
D. none of the above
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
The PIV rating of a crystal diode is _______________ that of equivalent vacuum diode
A. the same as
B. lower than
C. more than
D. none of the above
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
The leakage current in a crystal diode is due to _________________?
A. minority carriers
B. majority carriers
C. junction capacitance
D. none of the above
The forward voltage drop across a silicon diode is about _______________?
A. 2.5 V
B. 3 V
C. 10 V
D. 0.7 V
The knee voltage of a crystal diode is approximately equal to ________________?
A. applied voltage
B. breakdown voltage
C. forward voltage
D. barrier potential
