Diode and Application Electronics MCQs

By: Prof. Dr. Fazal Rehman | Last updated: April 30, 2025

1. : That eliminates fluctuation in a rectified voltage and produces a relatively smooth DC voltage, a component called:
(A) Filter
(B) Rectifier
(C) Modulator
(D) Amplifier

2. : When a 10 V peak input voltage is applied to limit the output voltage of a positive limiter to 5 V, then the bias voltage is:
(A) 0.7 V
(B) 3.4 V
(C) 4.3 V
(D) 3 V

3. : Linear regulation devices have:
(A) Two terminals
(B) Three terminals
(C) One terminal
(D) Four terminals

4. : If the peak voltage applied as input is 100 V, then the output voltage will be:
(A) 100 V
(B) 90 V
(C) 99.3 V
(D) 100.7 V

5. : ______ device is used to couple AC input from source to the rectifier:
(A) Rectifier
(B) Modulator
(C) Amplifier
(D) Transformer

6. : A transformer that is required to create a 180-degree input to the rectifier is:
(A) Stepped up secondary
(B) Center tapped secondary
(C) Step down secondary
(D) Split window primary

7. : Which circuit activity may shift a characteristic curve so that the diode operating point is different:
(A) Lower current
(B) High resistance
(C) High power (heat)
(D) All of the above

8. : Which block indicates a smooth DC input in a power supply diagram:
(A) Regulator
(B) Filter
(C) Transformer
(D) Rectifier

9. : A crystal diode consists of:
(A) One PN Junction
(B) Two PN Junctions
(C) Four PN Junctions
(D) Three PN Junctions

10. : When the arrow of a crystal diode is positive with respect to the bar, then the diode is:
(A) Forward bias
(B) Reverse bias
(C) Neither forward nor reverse
(D) Either forward or reverse

11. : The order of reverse current in a diode is:
(A) A
(B) μA
(C) mA
(D) KA

12. : When an ideal crystal is forward biased, it behaves as a perfect:
(A) Insulator
(B) Resistance material
(C) Conductor
(D) Transformer

13. : When full-wave rectified voltage has a peak value of 60 V, then the average value is equal to:
(A) 12.45 V
(B) 38.12 V
(C) 32.14 V
(D)23.13 V

14. : Bridge rectifier has:
(A) 2 diodes
(B) 3 diodes
(C) 1 diode
(D) 4 diodes