PAPER-2(ECE) ESE-2017 Solution SET-D

1. (A) Refer Page-18 of Advance Electronics book and it was discussed in class also

It describes the areas where thin oxides are needed to implement the transistor gates and allow implantations

to form p/n type diffusions. A thin layer of SiO2i s grown and covered with SiN and this is used as mask.

The bird's bead must be taken into account while designing thin-ox

2. (D) Direct Question from Class Notes

Same concept was discussed in class notes as shown below:

3. (A) Refer Page-80 of Advance Electronics Book and discussed in class also

4. (B) Refer Page-154 of Advance Electronics Book and discussed in class also

5.(C)

6.(B)

7.(D)

8.(A)

Same concept was discussed in class notes as shown below:

9.(D) Refer Page-53 of Advance Electronics book and discussed in class also

10.(D) Same question was discussed in class notes as follows

11.(A) Same concept was discussed in class notes as follows:

12.(B) Same concept was discussed in class notes as follows:

13.(A) Same concept was discussed in class notes as follows:

14.(B)

15.(C)

16.(D) Refer Page-75 Advance Electronics Class notes

17(B) Same concept was discussed in class notes as follows:

18.(C) Induced EMF is proportional to Inductance so statement -2 is wrong .

Same concept was discussed in class given below.

19(D)

There exists a definite relation between the direction of the induced current, the direction of the flux and the

direction of motion of the conductor. The direction of the induced current may be found easily by applying

either Fleming's Right-hand Rule or Lenz's Law. Fleming's rule is used where induced EMF is due to,

flux cutting (i.e. dynamically induced. EMF) and Lenz's when it is due to change by flux linkages (i.e.

statically induced Emf).

Fleming's Right-Hand Rule: “Hold out your right hand with forefinger, second fingure, and thumb at right

angles to one another. If the forefinger represents the direction of the field, and the thumb represents the

direction of the motion then, the second finger represents the direction of the induced emf in the coil”.

20(D)

A photo relay or light activated relay is a circuit which opens and closes the relay contacts according to the

light. Here a photo diode is used to sense the light. The photo diode offers a high resistance when there is no

light falling on it. Here the photo diode is connected in reverse biased condition. The only current flowing

through it will be due to the minority carriers. When light falls on it, the current due to the minority carriers

increase and the diode offers a low resistance. As a result the voltage across the diode will not be sufficient

to make the transistor Q1 forward biased and the relay will OFF.When there is darkness the photo diode

resistance increases and the voltage across it will become enough to forward bias the transistor Q1 making

the relay ON. The diode D2 is used as a freewheeling diode to protect the transistor from transients

produced to the switching of relay. By this way the load connected through the relay contacts can be

switched ON and OFF according to the light falling on the photo diode.

21.(B)

Refer Basic Electrical Book topic “Auto Transformer”

22.(B) Refer Page-80 of Advance Electronics Book and discussed in class also

23(A) Refer Page-212 Basic Electrical Book

Base Load Power Plants: Plants that are running continuously over extended periods of time are said to be

base load power plant. The power from these plants is used to cater the base demand of the grid. A power

plant may run as a base load power plant due to various factors (long starting time requirement, fuel

requirements, etc.). Examples of base load power plants are:

1. Nuclear power plant

2. Coal power plant

3. Hydroelectric plant

4. Geothermal plant

5. Biogas plant

6. Biomass plant

7. Solar thermal with storage

8. Ocean thermal energy conversion

24(B) Solar insolation is a measure of solar radiation energy received on a given surface area in a given time. It is

commonly expressed as average irradiance in watts per square meter (W/m2) or kilowatt-hours per square

meter per day (kW•h/(m2•day)) (or hours/day). In the case of photovoltaic it is commonly measured as

kWh/(kWp•y) (kilowatt hours per year per kilowatt peak rating).The object or surface that solar radiation

strikes may be a planet, a terrestrial object inside the atmosphere of a planet, or any object exposed to solar

rays outside of an atmosphere, including spacecraft. Some of the solar radiation will be absorbed, while the

remainder will be reflected. Usually the absorbed solar radiation is converted to thermal energy, causing an

increasing in the object’s temperature. Some systems, however, may store or convert a portion of the solar

energy into another form of energy, as in the case of photovoltaic or plants. The amount of insolation

received at the surface of the Earth is controlled by the angle of the sun, the state of the atmosphere, altitude,

and geographic location.

25.(C) Resolution is not related with accuracy.

26.(C) Discussed in control system classes

27.(A) Discussed in control system classes

28.(B) RAM&ROM was discussed in class in digital electronics

29.(B)

30.(C) Discussed in class in advance electronics speech processing

31.(C) It is based upon basic super position theorem.

32.(A) When light falls then new EHPs are created.

Same concept was discussed in class notes as shown below

33.(A) Same question was done in class notes as shown below.

34(D) Same formula was discussed in class.

35 (A) Discussed in class notes as given above.

36(C) Direct question from class notes

37(B) Since frequencies are very low so DC amplifier will be preferred.

38.(B) Virtual ground concept is due to high value of open loop gain and high value of input

impedance. Same concept was discussed in class notes as shown below.

39 (D) Same concept was discussed in class notes:

40(D) Same concept was discussed in class notes.

The illumination characteristics of a typical photoconductive cell are shown from which it is obvious that

when the cell is not illuminated its resistance may be more than 1 00 kilo ohms. This resistance is called

the dark resistance. When the cell is illuminated, the resistance may fall to a few hundred ohms. Note that

the scales on the illumination characteristic are logarithmic to cover wide ranges of resistance and illu-

mination that are possible. Cell sensitivity may be expressed in terms of the cell current for a given voltage

and given level of illumination.

The illumination characteristics of a typical photoconductive cell are shown from which it is obvious that

when the cell is not illuminated its resistance may be more than 1 00 kilo ohms. This resistance is called

the dark resistance. When the cell is illuminated, the resistance may fall to a few hundred ohms. Note that

the scales on the illumination characteristic are logarithmic to cover wide ranges of resistance and illu-

mination that are possible. Cell sensitivity may be expressed in terms of the cell current for a given voltage

and given level of illumination.

41(C) Same concept was discussed in class notes.

42(C) Same concept was discussed in class.

43(C) Direct question

44(D) Same concept has discussed in Q.19

45(B) In case of motional EMF it is vbl sinα

Discussed in class notes.

46(A) discussed in class notes as shown below

47.(C) Similar type of questions discussed in Machine subject

48.(C) Similar type of questions discussed in Machine subject

49.(C) Similar type of questions discussed in Machine subject

50.(D) Similar type of questions discussed in Machine subject

51.(B) Similar type of questions discussed in Machine subject

52.(D) Just solve by dimension only and has done these type of questions in class

53.(D) Same question was done in class notes

54(B) Ceramic material discussed in class notes in detail.

55.(B) Same question was done in class

56.(B) Same type of question done in class

57.(B) Same question was done in class.

58.(A) Same concept was done in class.

59.(B) For LED material should be direct band gap type material

60.(C) These methods were discussed in Nano Material class notes

61.(C) Repeated question and was discussed in class

62.(C) Repeated question and was discussed in class

63.(D) Repeated question and was discussed in class

64.(D) Repeated question and was discussed in class

65.(B) Repeated question and was discussed in class

66.(C) Repeated question and was discussed in class

67.(A) Repeated question and was discussed in class

68.(A) Repeated question and was discussed in class

69.(B)

70.(B) Same type of question discussed in cache memory

71.(D)

72.(D) direct question Loss=10log(NF) has done in class notes

73.(C)

74.(D) By definition of operating system has discussed in class

75.(D) Discuss same type of question in class notes.

76.(A) Discussed same concept in class notes

77.(B) Same type of question was discussed in class notes.

78.(A) Concept was discussed in class notes

79.(C)

80.(D) Same type of question was discussed in class

81(B)

82(C) Same Formula was discussed in class notes

83.(C) Same type of question discussed in class notes.

84.(D)

85.(C) Similar type of question was discussed

86. It should be N0/2

87.(C) such type of Qs were discussed in class

88.(D) Repeated question of assignment and was done in class

89.(B) Repeated question of assignment and was done in class

90.(D) Repeated question of assignment and was done in class

91.(C)

92.(B) Refer Measurement Notes

93(A) Refer Measurement Notes

94(A) Refer Measurement Notes

95(A) Refer Measurement Notes

96(D) Refer Measurement Notes

97(B) Refer Measurement Notes

98(B) Refer Measurement Notes

99(B) Refer Measurement Notes

100(C) Refer Measurement Notes

101.(B) Direct Question based upon formula

102.(D) Refer Measurement Notes

103(D) Refer Measurement Notes

104(D) Refer Measurement Notes

105(B) Refer Measurement Notes

106(A) Discuss in detail in TDM

107(A) Refer Measurement Notes

108(B) Refer Measurement Notes

109(D)

110(B) There are two types of Networks distributed and lumped networks.

111(C)

112(B)

113(D) Similar type Of Qs were discussed

114(D)

115(B) Not exact answer but matching with this.

116(B) Repeated Question From Class Notes

117(B) Inductor behaves like an open circuit at t=0

118(A) Refer Series RLC in Network class Notes

119(D) discussed in class notes

120(C)

121(A)

122(A)

123(D) Similar type of Qs was discussed in class notes

124(B) Similar type of Qs was discussed in class

125(C) Similar type of Qs was discussed in class.

126(C) Direct question on K-Map from Class notes

127(C) Direct Question from Class notes

128(D)

It is Mod-8 Counter so output will be f/8 .Many similar type of Qs discussed in class.

129(C) Many such type of questions were discussed in class notes.

130(B)

131(B) Same Question was discussed in class notes.

132(B) Ceramic Properties were discussed in class

133(B) Discussed in Machine class

134(D) Discussed in class notes

135(C) discussed in class notes

136(D) discussed in class notes

137(A) Same concept was discussed in class.

138(C) This concept was discussed in detail in class

139(B)

140(C)

141(D) It is direct formula discussed in class

142(C) Same Q was discussed in class

143(B) PCM is used for conversion from Analog to Digital at base band and pass band level only.

144(D)

145(C) Refer control system class notes

146(C) Refer control system class notes

147(A) Refer control system class notes

148(C) Direct formula for Entropy discussed in class notes

149(A) Refer control system class notes

150(B) Refer control system class notes