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Posted Date: 26 Apr 2009 Posted By:: KISHORE Member Level: Silver Points: 5 (Rs. 1)

2009 B.E Electronics & TeleCommunication Engineering ISRO Entrance test for scientist/EngineerSC, 2009 (Electronics) Question paper
Indian Space Research Organisation
Electronics and Communication Engineering
Instructions: 1. All questions carry equal marks of 3 for a correct answer and 1 for a wrong answer 2. A separate OMR sheet is provided for answering. 3.Multiple answers for a question will be regarded as a wrong answer. 4.Question booklets have been marked as A or B or C or D or E on the right end top corner which is mandatory to be written on OMR sheet in the box and bubble appropriately.
1. The greatest negative number which can be stored in a computer that has 8bit word length and uses 2's complement arithmetic is a. 256 b. 255 c.128 d. 127
2. Which of the following ADC's uses over sampling in its operation a. sigmadelta ADC b. Counter ramp converter c. Successive approximation register ADC d. Flash converter
3. A mealy state machine's output depends on a. state and output b. inputs c. state d. state and inputs
4. percentage modulation of an AM wave having a power content of 8KW at carrier frequency and 2KW in each of its side bands is a. 60% b.70% c.100% d.80%
5. Approximate equivalent noise temperature(deg.K) of an amplifier with a noise factor of 1.04 is a.301.6 b.11.6 c.278.4 d.5.8
6. A differential amplifier is used in the input stage of opamps to achieve very high a.open loop gain b.bandwidth c.slew rate d.CMRR
7. which two port parameters are best suited for analyzing a seriesshunt feedback circuit? a.Zparameters b.Hparameters c.Yparameters d.Sparameters
8. The characteristics equation of a closed loop control system is given as s^2+4s+16=0. The resonant frequency in radian per second of the system is a.2 b.2root of(3) c.4 d.2root of(2)
9. If a line is terminated in a open circuit, the VSWR is a.infinity b.0 c.1 d.1
10. Unit of relative permeability is a.Henry/meter b.Henrymeter c.Henry d.it is dimensionless
11. f(x)=[tan^2(x)] ([] stands for greatest integer function) a.f(x) continuous at at x=0 b. lim f(x) does not exist as x tends to 0 c. f'(0)=1 d.f(x) not derivable at x=0.
12. Number of real values of ((a+ib)^(1/n))+((aib)^(1/n)) is a.0 b.1 c.n d.none
13. A 5bit DAC has a current output. For a digital input of 10100, an output current of 10mA is produced. What will be the output current for a digital input of 11101? a.14.5 mA b.10 mA c.100mA d.not possible to calculate
14. The ethernet protocol uses a.CSMA/CA b.SCPC c.CSMA/CD d.slotted Aloha
15. A microcontoller differs from a Microprocesser in terma of a.I/O interfaces and instruction decoding b.Memory configuration and I/O interfaces c.data bus width and clock speed d.memory configuration and instruction decoding
16. An 8bit microcontroller has an external RAM with a memory map from 8000H to 9FFFh. The number of bytes this ram can store is a.8193 b.8192 c.8291 d.8000
17. An audio frequency of 15KH is frequency modulated with a deviation of 75KH. The resulting BW is a.180Kh b.150KH c.210KH d.240KH
18. A 1KW carrier is amplitude modulated to a depth of 60%. The total power in the modulated carrier is a.1KW b.1.06KW c.1.6KW d.1.18KW
19. An inductance of 1H is realized using air core with 100 turns. What will be the inductance if the no of turns are doubled a.1H b.0.5H c.2H d.none
20. An inductor of inductance 0.1H carrying current of 6amps will store energy of a.6Joules b.36J c.1.8J d.3.6J
21. A coil has self resistance of 5 ohms and inductance of 1muH. The value of Q at 1MH frequency is a.200 b.100 c.40 d.none
22. The closed loop transfer function of a unity feedback control system is G(s)=(1/(s+2)^2). The closed loop transfer function will have poles at a.2,+/j b.2,1 c.2,2 d.2,2
23. The dominant mode of propagation in a micro strip line in the low frequency approximation is a.TM11 b.quasiTEM c.TEM d.TE01
24. Consider a transmission line of characteristic impedance 50 ohms and the line is terminated at end by +j50 ohms, VSWR produced in the transmission line will be a.+1 b.0 c.1 d.infinity
25. The divergence of magnetic flux density is a.j b.rho c.0 d.infinity
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