View
240
Download
1
Category
Preview:
Citation preview
7/21/2019 Ec6201 Ed Notes Rejinpaul
1/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
2/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
3/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
4/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
5/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
6/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
7/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
8/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
9/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
10/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
11/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
12/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
13/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
14/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
15/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
16/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
17/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
18/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
19/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
20/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
21/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
22/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
23/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
24/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
25/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
26/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
27/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
28/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
29/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
30/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
31/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
32/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
33/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
34/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
35/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
36/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
37/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
38/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
39/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
40/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
41/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
42/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
43/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
44/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
45/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
46/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
47/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
48/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
49/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
50/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
51/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
52/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
53/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
54/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
55/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
56/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
57/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
58/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
59/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
60/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
61/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
62/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
63/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
64/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
65/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
66/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
67/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
68/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
69/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
70/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
71/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
72/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
73/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
74/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
75/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
76/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
77/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
78/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
79/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
80/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
81/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
82/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
83/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
84/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
85/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
86/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
87/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
88/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
89/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
90/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
91/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
92/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
93/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
94/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
95/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
96/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
97/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
98/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
99/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
100/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
101/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
102/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
103/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
104/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
105/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
106/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
107/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
108/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
109/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
110/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
111/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
112/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
113/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
114/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
115/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
116/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
117/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
118/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
119/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
120/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
121/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
122/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
123/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
124/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
125/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
126/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
127/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
128/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
129/136
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
130/136
SRI VIDYA COLLEGE OF ENGINEERING AND TECHNOLOGY
VIRUDHUNAGAR
Department of Electronics and Communication Engineering
Class/Sem:I ECE/II
Question Bank for EC6201-ELECTRONIC DEVICES
TWO MARKS QUESTIONS
Unit-5
Power Devices and Display Devices
Part-A
1.What is photo diode?
It is a light sensitive device used to convert light signal in to electrical signal. It is also
called photo detector
2. What is photo transistor?(AU-Apr/May 2009)
The photo transistor is a light detector, it combines photo diode and photo transistor. The
photo transistor cannot be directly used in control application.
3. What is photovoltaic sensors? (AU-Nov/Dec 2009, May/Jun 2010)
It is a light sensitive semi conductor devices, and it produce a voltage when the voltageincreases and the intensity of light falling on the semi conductor junction of this
photovoltaic cell increases.
4. What are the types of LED?
1. Surface-emitting LED
2. Edge-emitting LED
5. What are advantages of LED?
They are smaller in size
Its cost is very low
It has long life time
6. What are the Application of LED?
Used for numeric display in packet calculator
Used in the field of optical communication
Used in burglar-alarm system
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
131/136
7. What are the application of LCD?
Used as numerical counters for counting production items
Used for solid state video displays
Used for image sensing circuit
8. Compare LCD and LED (AU- May/ Jun 2013)
S.No LCD LED
1. LCD is a liquid unit whichmodulators the light to have display
LED is a Light Emitted Diode whichemits light during forward biasing
2. LCD is a Passive display device LED is an Active display device
3. Cost is very low Cost is high
4. Life time comparatively More life time
9.
Define holding current?Holding current is the current below which the SCR switches from the conduction state
(on state) to the forward blocking state
10.What are the different methods used to turn on SCR?
Gate triggering
Forward break over voltage
Light triggering
Rate effect (or) dv/dt triggering
11.
Give the application of SCR
Main application of SCR is a
As over light detector
Relay control
Regulated power supply
Motor control
12.What is latching current?
It is the minimum current required to trigger the device from its OFF state to ON state.
13.What is turn on time?
The time required by SCR to reach full conduction after triggering is called turn on time.
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
132/136
14.What is TRIAC?
TRIAC is a three terminal semiconductor switching device which can conduct in either
forward or reverse direction. The TRIAC is the combination of two SCRs connected in
parallel but in opposite direction.
15.
What is the application of TRIAC?
Heater control
Phase control
Light dimming control
Static switch to turn A.C power ON and OFF
16.Compare SCR and TRIAC.
S.No SCR TRIAC
1. Unidirectional device Bidirectional Device2. The reliability is more The reliability is less
3. Available in large ratings Not available in large ratings
4. Only one mode of operation ispossible
The operation in four different mode ispossible
17.What is DIAC?
A DIAC is two terminal semiconductor device and three layer bidirectional device, which
can be switched from of its OFF to ON state for either negative or positive polarity of
applied voltage.
18.
What is the application of DIAC?
The DIAC is used as a triggering device. It is not a control device. It is used in
Temperature control
Triggering of TRIAC
Light dimming circuits
Motor speed control
19.What is UJT?
Unijunction transistor is a three terminal semiconductor device consisting of only one PN
junction. It differs from ordinary PN diode in the sense that it has three terminals namelyEmitter, Base 1 and Base 2.
20.What is intrinsic stand OFF ratio of UJT?
The Intrinsic stand OFF ratio () is defined as the ratio between the internal dynamic
resistance (RBB)
=Rb1/RBB
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
133/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
134/136
27.List out the constructions of power MOSFET
Lateral +Double diffusion construction (LDMOSFET)
Vertical MOSFET (term V because of construction)
TMOSFET (term T because of channel shape)
28.
What are the advantages and disadvantages of Lateral &Double diffusion methods?
Advantages
Low gate signal power requirement
Fast switching speeds
Disadvantages
High resistance channels
Cost is high
29.
Define V-MOS
Two source, one gate and one drain, shorter and wider channel with small resistance.
Consists of double diffused n+ layer which is cut with V shaped groove.
30. Comparisons between Power BJT and Power MOSFET
Points Power BJT Power MOSFET
Switching Time Slow due to minority carrier devices Faster, No storage time and no
influence of temperature
Input Impedance Lower than MOS Very high
Break down
voltage
Depends on VCE Depends on VDS
Drive Hfe Rises and Ve falls along with
temperature rise
Extremely high stability
31. What are the classifications of Display Devices?
Active display devices
Passive display devices
32. What is meant by active display devices?
These are the display units which emit the light radiation in their own directly
Example: Light Emitting Diode (LED)
www.rejinpaul.com
Get useful study materials from www.rejinpaul.com
7/21/2019 Ec6201 Ed Notes Rejinpaul
135/136
7/21/2019 Ec6201 Ed Notes Rejinpaul
136/136
40. What are the materials used in LED?(AU-May/June 2012)
Gallium Arsenide(GaAs)
Gallium Phosphide(GaP)
Gallium Arsenide Phosphide(GaAsP)
Part-B
1. Draw the equivalent circuit of UJT and explain its operation(AU-Nov/Dec 2010, May/June
2013, Apr/May 2009, May/June 2010, May/June 2012)
2. Write short note on light activated SCR(AU-Nov/Dec 2009, May/June 2012)
3. Explain the operation and characteristics of SCR(AU- Nov/Dec 2009, May/June 2010,
May/June 2012)
4. Describe SCR ratings(AU-Nov/Dec 2009, May/June 2010, May/June 2012)
5. Explain the operations and characteristics of DIAC(AU-Nov/Dec 2010, , Apr/May 2009,
May/June 2012)
6. Explain the operations and characteristics of TRIAC(AU- Apr/May 2009)
7. Describe the operation of LED and LCD(AU-Apr/May 2009, Nov/Dec 2009, May/June
2012)
8. Explain the operations of power BJT
9 E l i h i f MOSFET
www.rejinpaul.com
Recommended