Karnataka Second PUC Electronics Question Paper of March, 2010

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Karnataka Second PUC Electronics Question Paper of March, 2010

Time : 3 Hours 15 Minutes                                                                          Max. Marks :90
Total No. of Questions : 40                                                                                Sub Code No.  40
                                   
Note : i)  The question paper has four Parts A, B, C & D.
          ii)  Question No. 23  in Part C and Question No. 32 in Part D are from practicals.
          iii) Read the instructions given for each Part. 
 
PART – A
Note : Answer all questions.  10 × 1 = 10
1.  Mention moderately doped region of a Transistor.  
2.  What is direct coupling ?
3.  What  happens  to  the  output  impedance  with  negative  voltage  series feedback amplifier ?
4.  Draw  the  output  waveform  of  Differentiator  when  sine  wave  input  is  applied.
5.  What is the value of feedback fraction of Wien-bridge oscillator ?
6.  Define signal to noise ratio.
7.  In AM modulation the Signal Amplitude is 15 mV and Carrier Amplitude is  30 mV. Find modulation index.
8.  Write the Boolean expression for two input of XOR gate.
9.  Give an example for non-weighted code.
10.  Expand MTSO. 
  
PART – B
Note :  Answer any ten questions.  10 × 2 = 20
11.  Write  the  three  operating  regions  of a  transistor. Which  region  is used  in amplifiers ?  
12.  A transistor has β = 100,  if base current is 50 µA. Determine the collector current and α.
13.  Why  do  we  need  multistage  amplifier  ? Write  the  expression  for  overall voltage gain of two-stage amplifier.
14.  Distinguish between negative feedback and positive feedback.
15.  Draw the circuit diagram of op-amp integrator and write the output voltage expression.
16.  State Barkhausen criterion for sustained oscillations.
17.  Mention the layers of the ionosphere.
18.  Calculate the carrier swing of FM wave for the frequency deviation 5 kHz.
19.  Draw the circuit diagram of linear diode detector.
20.  Write the logic symbol and Boolean expression for two input NAND gate.
21.  Convert   into Excess-3 Code.
22.  What is satellite ? Mention one application of it.  

PART – C
I.  Answer the following question :  1 × 4 = 4
23.  Using  the  following  data,  calculate  the  theoretical  and  experimental
value of frequency of Wien-bridge oscillator : 
 
II.  Answer any five questions :  5 × 4 = 20
24.  Explain the working of NPN transistor with neat diagram.
25.  A multistage amplifier has the individual voltage gains of 50, 100 and  150. What is the overall gain in dB ? Express each gain in dB. 
26.  Derive  an  expression  for  the  output  impedance  of  voltage  series negative feedback amplifier.
27.  Derive  an  expression  for  output  voltage  of  an  op-amp  inverting amplifier. Also show input and output waveforms.
28.  Explain the working of Hartley oscillator with neat circuit diagram.
29.  Derive  an  expression  for  the  instantaneous  voltage  of  the  frequency modulated wave.
30.  Explain with block diagram and truth table, the action of JK Flip-flop.
31.  What  is Half  Adder  ?  Realise Half Adder using  XOR  and  basic  gate along with output Boolean expression and write its truth table.
 
PART – D
I.  Answer the following question :  1 × 6 = 6 
32.  Write  the  pin  diagram  of  IC  7400.  Realise  NOT, OR  and AND  gates  experimentally using IC 7400.
OR 
Describe  an  experiment  to  study  the  frequency  response  of CB-amplifier. 

II.  Answer any five questions :  5 × 6 = 30
33.  a)  Classify  the  amplifiers  based  on  configuration  and  write  their
applications.
  b)  The emitter current of a  transistor  is 100 mA with  the collector
resistor  .  Calculate  voltage  gain.  Given
.  4 + 2
34.  a)  What is photo-transistor ? Write the symbol and any two uses of
it. 
  b)  An amplifier has  lower cut-off  frequency 500 Hz and upper cut-
off frequency of 400 kHz. Calculate bandwidth.  4 + 2
35.  a)  Find the output voltage for the following circuit diagram : 
 
b)  Write the Ideal characteristics of an ideal op-amp.  4 + 2 
36.  a)  With  a  neat  circuit  diagram,  explain  the  working  of  RC  phase shift oscillator.
      b)  Calculate the frequency of a tuned circuit. Given L = 10 mH and C = 0·01 µF.   4 + 2
37.  a)  An  FM  wave  has  carrier  frequency  of  50  MHz,  frequency  deviation 10 kHz by modulating signal of frequency 5 kHz. If  the  amplitude  of  unmodulated  carrier  is  20  volts,  write  the equation of FM wave.
      b)  Distinguish between AM and FM.  4 + 2  
38. a)  Using K-map simplify the expression  f ( ABCD ) = ∑ m ( 0, 4, 5, 8, 12 ) and draw logic circuit for simplified expression using basic gates.
      b)  Define the following :
         i)  Selectivity
         ii)  Fidelity.  4 + 2 

39.  a)  Draw  the  circuit  diagram  of  DTL  NOR-gate  and  explain  it’s working. Write its truth table.
      b)  Express   in canonical sop form.  4 + 2
40.  Draw  the  block diagram  of  TV  receiver  and  explain  its working with each block.  6
                                       
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