ISRO PAPER - 04 MAY 2008
1) Moore model of DFF?
2) Which of the following filter has steep roll-off characteristics?
(A) Butterworth filter (B) Chebyshev filter (C) Bessel filter (D)--
ans: B
3) The architecture of DSP processor---------
(A)Havard (B) Von neumann (C)...(D)..
ans: A
4) If the input frequency to a 6 stage ripple counter is 1000MHz then output frequency at 6th stage_______
5) Minimum number of 2 input NAND gates required to realise the fn. AB'+CD'+EF'
ans: 6
6) What will exit() fn. in C will do?
7) goto command in C will cause the program to jump to----
ans: Label
8) VSWR is given then asked to find out reflection coefficient
9) The relation between power in FM signal and modulation index--------
10) If two signals are AM modulated with modulation indices of 0.3 and 0.4 what will be the modulation index of combined signal?
ans: Calculate using 1/M=(1/m1)+(1/m2)
11) If n stage pipelining is used in aprocessor, then what will be the speed improvement over nonpipelined processor?
(A) same (B) n (C) n! (D) 2n
12) One circuit is given (That was a Voltage Doubler using op-amp) and asked to Identify that...
13) Which one of the following memory has fastest write time?
(A) Flash (B) EEPROM (C) EPROM (D) None of these
14) In EEPROM data is stored in____
(A) Cross coupled Latch (B) Capacitor (C) floating gate transistor (D)--
15) Which technology is faster?
(A)Bipolar (B) MOS (C) CMOS (D) ..
16) Memory access time, cache access time, hit ratio are given, Asked to find out Average memory access time
17) If the probability of getting a job for A is 1/3 and the probability of getting a job for B is 1/4 then the probability of getting a job for A or B will be____?
18) One transfer fn As4 + Bs3 + Cs2 +D=0 (I dont remember the values of A,B,C,D ) is given, Asked to find out whether the system is____
(A) Stable (B) Unstable (C) Marginally Stable
19) For implementing D flipflop using RS flip flop, the extra component needed is____
(A) AND gate (B) OR gate (C) NOT gate (D) NOR gate
20) The output of an 8 bit DAC is 1Volt when the input is 00110010, then the full scale output of the same DAC will be____
ans: 5.1 V (Hint: 1/50*255)
21) Fastest ADC is___
(A) SAR (B) sigma- delta (C) flash (D)...
http://www.ChetanaS.org
22) The operating point of Class-B amplifier will be at_____
(A) exactly at cut-off region (B) inside saturation region (C) inside cut-off region (D) middle of active region
23) For an N bit ADC , the number of comparators needed___
(A) N (B) 2N (C) 2N -1 (D) 2N-1
24) De-emphasis circuit is used for_______
ans: Attenuating high frequency components
25) The laplace transform of e-2t _____
Ans: 1/(s+2)
26) The magnitude of 1+cos x+j sin x____
Ans: 2 cos (x/2)
27) A circuit is given in which the capacitor (1uF) is initially charged to 12V, At t = 0, one switch is closed so that another capacitor of capacity 1.5uF comes in parallel with the first capacitor, then in steady state what will be the voltage across them? ( Visualize the circuit, as I can not draw the circuit since the editor is not supporting it)
28) Alpha of a transistor=0.99, Ico=1uA, Ie=1 mA, Ic=?
29) If the input given to an inductor is delta(t) (ie: =1 when t=0 and ,=0 otherwise) then the current will be___
(A) infinity (B) -infinity (C) 1 (D) 0
30) For implementing Band pass filter using High pass filter(Cutt off freq=Fh) and Low pass filter (cutt off freq= Fl)_____
(A)Fh=Fl (B) Fh>Fl (C) Fh<F1 (D)..
Ans: Fh<Fl
31) In the Enhancement type MOSFET the gate to source voltage Vs drain current characteristics will be____
Ans: Drain current Increases as Vgs increases in active region
32) In a johnson counter, How many state have to be changed to increment the count from 0100 to 0111?
33) Odd parity generator is____
Ans: XNOR gate
34) A circuit using op-amp was given, the question was to calculate output offset voltage___
Ans: Vo(off)=Vin(off)*(1+Rf/R1)
35) Antialiasing filter is_____
(A) Digital filter (B) Analog filter (C) Can be Analog or digital (D) RC filter
2) Which of the following filter has steep roll-off characteristics?
(A) Butterworth filter (B) Chebyshev filter (C) Bessel filter (D)--
ans: B
3) The architecture of DSP processor---------
(A)Havard (B) Von neumann (C)...(D)..
ans: A
4) If the input frequency to a 6 stage ripple counter is 1000MHz then output frequency at 6th stage_______
5) Minimum number of 2 input NAND gates required to realise the fn. AB'+CD'+EF'
ans: 6
6) What will exit() fn. in C will do?
7) goto command in C will cause the program to jump to----
ans: Label
8) VSWR is given then asked to find out reflection coefficient
9) The relation between power in FM signal and modulation index--------
10) If two signals are AM modulated with modulation indices of 0.3 and 0.4 what will be the modulation index of combined signal?
ans: Calculate using 1/M=(1/m1)+(1/m2)
11) If n stage pipelining is used in aprocessor, then what will be the speed improvement over nonpipelined processor?
(A) same (B) n (C) n! (D) 2n
12) One circuit is given (That was a Voltage Doubler using op-amp) and asked to Identify that...
13) Which one of the following memory has fastest write time?
(A) Flash (B) EEPROM (C) EPROM (D) None of these
14) In EEPROM data is stored in____
(A) Cross coupled Latch (B) Capacitor (C) floating gate transistor (D)--
15) Which technology is faster?
(A)Bipolar (B) MOS (C) CMOS (D) ..
16) Memory access time, cache access time, hit ratio are given, Asked to find out Average memory access time
17) If the probability of getting a job for A is 1/3 and the probability of getting a job for B is 1/4 then the probability of getting a job for A or B will be____?
18) One transfer fn As4 + Bs3 + Cs2 +D=0 (I dont remember the values of A,B,C,D ) is given, Asked to find out whether the system is____
(A) Stable (B) Unstable (C) Marginally Stable
19) For implementing D flipflop using RS flip flop, the extra component needed is____
(A) AND gate (B) OR gate (C) NOT gate (D) NOR gate
20) The output of an 8 bit DAC is 1Volt when the input is 00110010, then the full scale output of the same DAC will be____
ans: 5.1 V (Hint: 1/50*255)
21) Fastest ADC is___
(A) SAR (B) sigma- delta (C) flash (D)...
http://www.ChetanaS.org
22) The operating point of Class-B amplifier will be at_____
(A) exactly at cut-off region (B) inside saturation region (C) inside cut-off region (D) middle of active region
23) For an N bit ADC , the number of comparators needed___
(A) N (B) 2N (C) 2N -1 (D) 2N-1
24) De-emphasis circuit is used for_______
ans: Attenuating high frequency components
25) The laplace transform of e-2t _____
Ans: 1/(s+2)
26) The magnitude of 1+cos x+j sin x____
Ans: 2 cos (x/2)
27) A circuit is given in which the capacitor (1uF) is initially charged to 12V, At t = 0, one switch is closed so that another capacitor of capacity 1.5uF comes in parallel with the first capacitor, then in steady state what will be the voltage across them? ( Visualize the circuit, as I can not draw the circuit since the editor is not supporting it)
28) Alpha of a transistor=0.99, Ico=1uA, Ie=1 mA, Ic=?
29) If the input given to an inductor is delta(t) (ie: =1 when t=0 and ,=0 otherwise) then the current will be___
(A) infinity (B) -infinity (C) 1 (D) 0
30) For implementing Band pass filter using High pass filter(Cutt off freq=Fh) and Low pass filter (cutt off freq= Fl)_____
(A)Fh=Fl (B) Fh>Fl (C) Fh<F1 (D)..
Ans: Fh<Fl
31) In the Enhancement type MOSFET the gate to source voltage Vs drain current characteristics will be____
Ans: Drain current Increases as Vgs increases in active region
32) In a johnson counter, How many state have to be changed to increment the count from 0100 to 0111?
33) Odd parity generator is____
Ans: XNOR gate
34) A circuit using op-amp was given, the question was to calculate output offset voltage___
Ans: Vo(off)=Vin(off)*(1+Rf/R1)
35) Antialiasing filter is_____
(A) Digital filter (B) Analog filter (C) Can be Analog or digital (D) RC filter
ISRO-2008
1. How many NAND gates required to implement AB+CD+EF
ANS. 4
2. Transparent latch is seen in which type of flip flop
ANS. D flip-flop.
3. Odd parity generator uses which logic?
1. Digital 2.Analog 3. Sequential 4.none
4. One question based on Ripple counter.
5. Which diagram corresponds to D-flip-flop?
6. Which type of ADC is fastest?
ANS-flash/Parallel
7. Which one of the following is fastest read/writable memory?
1. PROM 2. EEPROM 3. Flash 4.none
8. In array programming which one is used
1. SISD 2. PISD 3. MISD 4. None
9. DSP uses the computer architecture derived from- 4 options. I don?t remember.
10. Solve ?(t2?(t-2)dt ?
11. they given the Bargraph and asked to find the voltage from it?
12.find laplace transform of e-2t?
ANS- 1/s+2.
13. Which one of the following is correct-4 options i dont remember?
14. Given VSWR=2 find reflection coefficient?
ANS-1/3
15.There are 2 seats to fill in a office a wife and husband came for the interview. For overall competition the probability of a wife to get selected is 1/7. The probability of husband to be selected is 1/5. Then find the probability of either wife/husband to get selected?
16.given matrix 4 -3 -3
1 0 1
-5 -5 x find x?
17. Find the differential equation of y=Ae3x+Be2x ?
18. one problem based on determination of resistance and one on inverting and non inverting Amplifier.
19. two Questions based on capacitor and one question based on inductance?
20. The Unit step signal is given to inductance what is the output?
http://www.ChetanaS.org
21. what is the difference b/w switch and HUB?
1. switch avoids flooding
2. HUB stops broadcasting.
22. one question related to Energy signal and time signal (Depending on amplitude and Phase)?
23.a question related to switch to find resistance if switch is closed?
24. A question based on SI and GE?
25. one question based on Enhancement MOSFET?
26. problem to find Iceo?
27.what is the advantage of using 4 diodes in Bridge rectifier compared to full wave rectifier?
28. Question related to PIV of bridge rectifier compared to Full wave rectifier?
29.Which one of the following has high I/p impedance
1. CC 2. CB 3. CE 4. None
30. one question based on FET And JFET?
31. where does operating point located in B type power amplifier?
32. which type of power amplifier is used in satellite communication
1.Amplitron 2. Klystron 3. Magnetron 4. TWT
http://www.ChetanaS.org
33. de-emphasis is used to
1. Attenuate low signals.
2. Attenuate High signals.
3.Attenuate middle signals.
4. none.
34. Envelope detector is an .....? Ans- Asynchronous detector.
35.which one of the following produce modulated signal as i/p signal?
1. FM 2. PM 3. AM 4. None
36. they asked to find the gain? Given o/p power and i/p power.-4 options
37. Asked a question from EMfield on HEBD something.. i dont rem...?
38. find the modulous of 1+cosA+isinA?
ANS. 4
2. Transparent latch is seen in which type of flip flop
ANS. D flip-flop.
3. Odd parity generator uses which logic?
1. Digital 2.Analog 3. Sequential 4.none
4. One question based on Ripple counter.
5. Which diagram corresponds to D-flip-flop?
6. Which type of ADC is fastest?
ANS-flash/Parallel
7. Which one of the following is fastest read/writable memory?
1. PROM 2. EEPROM 3. Flash 4.none
8. In array programming which one is used
1. SISD 2. PISD 3. MISD 4. None
9. DSP uses the computer architecture derived from- 4 options. I don?t remember.
10. Solve ?(t2?(t-2)dt ?
11. they given the Bargraph and asked to find the voltage from it?
12.find laplace transform of e-2t?
ANS- 1/s+2.
13. Which one of the following is correct-4 options i dont remember?
14. Given VSWR=2 find reflection coefficient?
ANS-1/3
15.There are 2 seats to fill in a office a wife and husband came for the interview. For overall competition the probability of a wife to get selected is 1/7. The probability of husband to be selected is 1/5. Then find the probability of either wife/husband to get selected?
16.given matrix 4 -3 -3
1 0 1
-5 -5 x find x?
17. Find the differential equation of y=Ae3x+Be2x ?
18. one problem based on determination of resistance and one on inverting and non inverting Amplifier.
19. two Questions based on capacitor and one question based on inductance?
20. The Unit step signal is given to inductance what is the output?
http://www.ChetanaS.org
21. what is the difference b/w switch and HUB?
1. switch avoids flooding
2. HUB stops broadcasting.
22. one question related to Energy signal and time signal (Depending on amplitude and Phase)?
23.a question related to switch to find resistance if switch is closed?
24. A question based on SI and GE?
25. one question based on Enhancement MOSFET?
26. problem to find Iceo?
27.what is the advantage of using 4 diodes in Bridge rectifier compared to full wave rectifier?
28. Question related to PIV of bridge rectifier compared to Full wave rectifier?
29.Which one of the following has high I/p impedance
1. CC 2. CB 3. CE 4. None
30. one question based on FET And JFET?
31. where does operating point located in B type power amplifier?
32. which type of power amplifier is used in satellite communication
1.Amplitron 2. Klystron 3. Magnetron 4. TWT
http://www.ChetanaS.org
33. de-emphasis is used to
1. Attenuate low signals.
2. Attenuate High signals.
3.Attenuate middle signals.
4. none.
34. Envelope detector is an .....? Ans- Asynchronous detector.
35.which one of the following produce modulated signal as i/p signal?
1. FM 2. PM 3. AM 4. None
36. they asked to find the gain? Given o/p power and i/p power.-4 options
37. Asked a question from EMfield on HEBD something.. i dont rem...?
38. find the modulous of 1+cosA+isinA?
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