1. . A Zener diode in forward-bias mode has a turn-on voltage of:
(A) 0.3 and 0.7 V
(B) 0.3 and 0.9 V
(C) 0.4 and 0.7 V
(D) 0.5 and 0.7 V
2. . Zener diode is mainly used for:
(A) Power generation
(B) Current amplification
(C) Voltage regulation
(D) Signal modulation
3. . The breakdown in a Zener diode occurs due to:
(A) Forward conduction
(B) Thermal runaway
(C) Zener effect and impact ionization
(D) Capacitance effect
4. . Photodiode works primarily in:
(A) Forward-bias mode
(B) No-bias mode
(C) Reverse-bias mode
(D) Both a and b
5. . DIAC is a:
(A) Bi-directional semiconductor switch
(B) Unidirectional diode
(C) Tri-terminal transistor
(D) Zener diode
6. . TRIAC is different from DIAC because it:
(A) Conducts only in forward direction
(B) Is uncontrolled and has two terminals
(C) Is controlled and has three terminals
(D) Is used as voltage regulator
7. . The main purpose of using DIAC with TRIAC is:
(A) To increase voltage
(B) To reduce current
(C) To provide symmetrical triggering
(D) To act as a rectifier
8. . TRIAC can control AC power by:
(A) Adjusting series resistor
(B) Adjusting gate voltage
(C) Changing frequency
(D) Connecting in series with Zener diode
9. . Saturable core reactor is mainly used for:
(A) Signal modulation
(B) DC voltage regulation
(C) Amplification of signals
(D) AC power control through a load
10. . The key advantage of a Zener diode is:
(A) Amplifies signals
(B) Acts as a switch for AC
(C) Converts AC to DC
(D) Maintains a constant voltage over a wide range of currents