T4Tutorials .PK

Chapter 7 SPECIAL PURPOSE DIODES AND DEVICES MCQs

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




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