comprehensive viva voce questions for ece with o
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comprehensive viva voce questions for ece with answers
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Viva Q & A Department of Electronics and Communication Engineering - Question-Answer 1. Define Confidence?
There is an electronic circuits purifying which gives alternate indications for moving around in DC
2. Define the perfect wave net?
This refiner includes two different transformers and two diodes in the center. The center is based on the tap. [i.e] its capacity is kept at zero
3. Define the construction of the perfect wave purifier?
The anodes of diode1 and diode 2 are connected to the transformer secondary terminal A and B, respectively. 2 diode cathode connected to the load
4. What are the qualifications for purifying the full wave?
Flame is less in comparison to Halt Wave Rectifier
5. What are the major disadvantages of purifying the full wave?
Here the transformer used in the center is used, the high cost
6. What are the futures of the full wave capacitor [center-null]?
Efficiency - 81.2% waveform factor - 0.48PIV - 2vm.Output frequency - 2fin.Diodes - 2
7. Define Photo Diode?
This junction photo is one of the conductive devices.
8. Define photos - Conductive effects?
When the incident falls on the surface of a semi-conductor, the result of the semi-conductor leads to the carrier from some adsorption of the light resulting in increased conductivity. This effect is known as photo conductive effect.
9. What are the two types of junction?
(I)

Photo diode (Ii)

Photo transistor
10.What are the devices that fall on the wholesale photo-conductive devices category
LDR, thermometer and sensor
11. What are the applications of Photo Diode?
1. Light detection system. 2. An optical coupler. 3. Lightweight switch powered 4. Encoder 5 Modulation

VVQ and AD Jayakumar 2
12. Define the semi-conductor diode?
When we get involved in a piece of 'P' material and 'N' material, so that the crystal structure is moderate on the boundary. PN junction is formed, it is called a semi-conductor diode
13. Define the precipitation layer?
A layer that does not have a free charge carrier. I only include inconvenient receiver and brain ion.
14. Define knee voltage?
The knee voltage is the voltage on which the diode starts.
15. What is the knee voltage for silicon and germanium?
C = 0.6 VS GE = 0.2 V
16. What are the other names of knee voltage?
(i) Threshold Voltage (ii) Cut-in voltage (iii) Offset voltage
17. What are the other names of the displacement area?
(i) Space charge area (ii) Ionic region
18. Why is the diode called Uni-Direct Device?
Because it only turns in forward direction
19. What does the reverse saturation mean by present?
During reverse lifting, the reverse current produced by the minority carrier is called reverse saturation.
20. What are the applications of diodes?
Diodes are used in correcting, regulatory, clipper, clampers, detectors, etc. ...,
21. What is the second name of point contact diode?
Cut Victor Diode
22. What is transistor?
Particularly arranged semi-conductor provides less resistance to current flow in one part. In the second part, thigh resistance is offered, such a system of a semi-conductor is called transistor.
23. Why do we call the transistor as bi-polar component?
The transistor is called as a bi-polar component, because this operation depends on both multi-functional and destructive carriers.
24. Why do we call the transistor as a transistor?
Because, it varies from the resistance path less than the high resistance path to the present.
25. What are the types of transistors?
Two types: (i)

Point contact (it is defective, now it is out of use) (Ii)

Junction transistor (this one day is used now)
26 how many terminals are in transistor, what are they? Define that work?
Terminal:
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