📣 Paper 3 has been removed from NET from 2018 (Notification)- now paper 2 and 3 syllabus is included in paper 2. Practice both paper 2 and 3 from past papers.

NTA NET December 2018 Electronic Science Part 2

Online Paper 1 complete video lectures with Dr. Manishika Jain. Join now!

Detailed solutions to these questions are available at doorsteptutor. com

Q-21 In an Optical coupler:

Circiut for Q 21

Following statements are given

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (ii) and (iii)
  2. (i) and (iv)
  3. (ii) and (iv)
  4. (i) and (iii)

Q-22 In register indirect Addressing mode the offset address of data is in

  1. BX
  2. SI
  3. DI
  4. DX

Choose the correct answer from the code given below:

Options:-

  1. (i) and (iv) are correct
  2. (ii) , (iii) and (iv) are correct
  3. (i) , (ii) and (iii) are correct
  4. (i) , (iii) and (iv) are correct

Q-23 the equivalent circuit of a tunnel diode shown below has the total input impedance

Circiut for Q 23

choose the correct answer from the code given below:

Options:-

  1. (i) and (iii) are correct
  2. (ii) is correct , but (i) is wrong
  3. (iii) is correct , but (iv) is wrong
  4. (i) is correct , but (iii) is wrong

Q-24 A lossless air dielectric cylindrical waveguide of inside diameter 2 cm is operated at 10 GHz. For mode propagating in + z direction, following has been evaluated:

  1. Cut – off frequency = 9.148 GHz
  2. Cut-off frequency = 8.814 GHz
  3. Wave impedance = 152.269Ω
  4. Wave impedance = 15.26Ω

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (ii) and (iii)
  2. (i) and (iii)
  3. (i) and (iv)
  4. (ii) and (iv)

Q-25 Which of the following circuits are correct with refernce to the inverter?

  1. Circuit for Q 25 A
  2. Circuit for Q 25 B
  3. Circuit for Q 25 C
  4. Circuit for Q 25 D

Which of the above are correct?

Choose the correct answer from the code given below:

Options:-

  1. (i) , (ii) and (iv) are correct
  2. (i) , (ii) , (iii) and (iv) are correct
  3. (ii) , (iii) and (iv) are correct
  4. (i) , (iii) and (iv) are correct

Q-26 In a circuit shown below, the voltage at each drain terminal is

Voltage at Drain

Choose the correct answer from the code given below:

Options:-

  1. (iii) is correct but (i) is wrong
  2. (iv) is correct but (ii) is wrong
  3. (ii) is correct but (iii) is wrong
  4. (i) is correct but (iv) is wrong

Q-27 For thyristor operation, following statements are given:

  1. The supply voltage must be greater than the forward break over viltage.
  2. The supply voltage must be less than the forward break over viltage.

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (ii) and (iii)
  2. (i) and (iv)
  3. (i) and (iii)
  4. (ii) and (iv)

Q-28 What will be the output of the program?

Main ()

{

char s [] = “AWb what the heck” ;

printf ( “n % s” , s) ;

printf ( “% s” , s [3] ) ;

}

Options:-

  1. Awb what the heckb
  2. Awb what the heckW
  3. Awb what the heck
  4. W

Q-29 Consider the following statements with respect to the characteristic polynomial defined as

  1. The system is stable for
  2. The system is unstable for
  3. The system is unstable for
  4. The system is stable for

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (ii) and (iii)
  2. (ii) and (iv)
  3. (i) and (iii)
  4. (i) and (iv)

Q-30 In minimum mode 8086 microprocessor

  1. All control signals are given by microprocessor chip itself
  2. The remaining components in the system are latches, transreceivers clock generator, memory and I/O devices
  3. It has more than one microprocessor
  4. Facilities are provided for implementing allocation of global resources

Choose the correct answer from the code given below:

Options:-

  1. (i) and (iv) are correct
  2. (i) and (ii) are correct
  3. (ii) and (iii) are correct
  4. (i) , (iii) and (iv) are correct

Q-31 What is the output of this program?

main ()

{

int s [5] [2] = {

{1234,56} ,

{1212,33} ,

{1434,80} ,

{1312,78}

} ;

int i, j

for (i = 0; i <= 3; i ++)

{

printf ( “⧵n” ) ;

for (j = 0; j, = 1; j ++)

printf ( “% d” , ⚹ (⚹ (s + i) + j) ) ;

}

}

Options:-

  1. 1212 33

1234 56

1312 78

1434 80

  1. 1235 57

1213 34

1435 81

1313 79

  1. 1234 56

1212 33

1434 80

1312 78

  1. 1312 78

1434 80

1212 33

1234 56

Q-32 The average value of the full Wave rectified voltage shown below is

Average Value of Rectifier
  1. 7.5 V
  2. 9.55 V
  3. 10.0 V
  4. 5.0 V

Choose the correct answer from the code given below:

Options:-

  1. (i) and (ii) are correct
  2. (iii) is correct, but (ii) is wrong
  3. (ii) is correct, but (iv) is wrong
  4. (i) is correct, but (iii) is wrong

Q-33 Read the following statements regarding state variable analysis.

  1. A purely resistive network has no states at all.
  2. A purely resistive network has more states than a reactive network
  3. Only a reactive network can have states
  4. A network with energy storing elements has no states at all.

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (ii) and (iv)
  2. (ii) and (iii)
  3. (i) and (iv)
  4. (i) and (iii)

Q-34 A basic equivalent circuit of a tunnel diode consists of series inductance , the series resistance , the diode capacitance and the negative resistance – R. the reactive cut-off frequency is

Choose the correct answer from the code given below:

Options:-

  1. (i) is wrong but (ii) is correct
  2. (iii) is correct but (iv) is wrong
  3. (iii) and (iv) are correct
  4. (iv) is correct but (ii) is wrong

Q-35 Which of the following statements are correct with refernce to superheterodyne receivers?

  1. The main advantage of superheterodyne receiver is its better tracking
  2. The main advantage of superheterodyne receiver is improvement in sensitivity
  3. The image channel rejection in superheterodyne receiver comes from IF stages only
  4. The image channel rejection in superheterodyne receiver comes from RF stage only

Choose the correct answer from the code given below:

Options:-

  1. (i) and (ii) are correct
  2. (ii) and (iii) are correct
  3. (ii) and (iv) are correct
  4. (i) and (iv) are correct

Q-36 Read the following statements regarding the strain gauge transducer system.

  1. It has negligible loading effect on the primary transducer.
  2. It has advantage of formation of push-pull systems for temperature compensation
  3. It has maximum loading effect on the primary transducer.
  4. It has very large size and hence increases the size of primary elastic transducer

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (i) and (iii)
  2. (ii) and (iii)
  3. (ii) and (iv)
  4. (i) and (ii)

Q-37 in which of the below mwntioned logic families, the transistors operate between cut-off and active (non-saturation) states?

  1. Transistor-transistor Logic (TTL)
  2. Schotty TTL
  3. Diode Transistor Logic (DTL)
  4. Emitter Coupled Logic (ECL)

Choose the correct answer from the code given below:

Options:-

  1. (ii) and (iv) are correct
  2. (i) and (iv) are correct
  3. (i) and (iii) are correct
  4. (ii) and (iii) are correct

Q-38 For an optical fiber, following statements are given:

  1. Propagation constant is dependent on wavelength
  2. Propagation constant is independent of wavelength

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (i) and (iv)
  2. (i) and (iii)
  3. (ii) and (iii)
  4. (ii) and (iv)

Q-39 Read the following statements regarding a constant-K low pass filter.

  1. The cut-off frequency of the filter is
  2. The cut-off frequency of the filter is
  3. The phase shift in stopband is π
  4. The phase shift in passband is 2π

Which of the above statements are correct?

Choose the correct answer from the code given below:

Options:-

  1. (ii) and (iii)
  2. (ii) and (iv)
  3. (i) and (iv)
  4. (i) and (iii)

Q-40 Which of the following statements are correct w. r. t the vestigial sideband modulation?

  1. As compared to SSB-Sc, the bandwidth of vestigial sideband becomes larger
  2. The filter required needs to have a sharp cut-off
  3. The transmitted vestige of the undesired sideband compensates the loss of wanted sideband
  4. Vestigial sideband is used in TV for transmission of the picture and sound signals

Choose the correct answer from the code given below:

Options:-

  1. (iii) and (iv) are correct
  2. (i) and (ii) are correct
  3. (i) and (iv) are correct
  4. (i) and (iii) are correct