BSNL JTO PAPER 2005 SECTION -II
TECHNICAL SECTION -II1. A transistor is operated as a non-saturated switch to eliminate a) storage timeb) turn - off timec) turn - on timed) delay time2. . The output Y of the circuit in the given figure is
a)(A + B)C + DE b) AB + C(D + E)c) (A + B)C + D + Ed) (AB + C) . DE3. Rotors used in a two-phase ac servomotor is a) solid iron motorb) squirrel cage rotorc) drag cup rotord) both b and c4. Major advantage of TWT over a klystron lies in its a) higher bandwidthb) higher outputc) higher frequencyd) higher gain5. The op-map circuit shown in the given figure can be used for a)addition b) subtractionc) both addition and subtractiond) multiplication6. The Boolean expression for the shaded area in the given Venn diagram is
7. A lag compensator is basically a a) high pass filterb) band pass filterc) low pass filterd) band elimination filter8. Transfer function T (S) of the system in the given fig is-
9. The overall transfer function for a unity feedback system is 4/S^2+4s+4
Mark the correct statement regarding this system
1. Position error constant kp for the system is 4
2. The system type one.3. The velocity error constant kv for the system is finite.Select the correct answer using the codes given below-Codesa) 1,2 and 3
b) 1 and 2
c) 2 and 3
d) 1 and 3
10. If the rotor is resistance and reactance are respectively R and X1 its length and diameter are L and D for two phase a) c) servomotor, then- a) X/R and L/D are both are small
b) X/R is large but L/D is less
c) X/R is less but L/D is large
d) X/R and L/D both are large
11. In a PID controlles the transfer function G(s) is- a) K(1+1/Tis+Tds)a) K(1+Tis+Tds)a) K(1+1/Tis+1/Tds)a) K(1+Tis+1/Tds)12. Transfer function 600/ S(S+1)(S+15)(S+20) can be approximated by the system- a) 2/ S(S+1)b) 40/ (S+20)(S+1)c) 40/ S(S+20)d) 600/ SS+15)(S+20)13. The transfer function of an amplifier is given Av = Vo/Vs = 2810/(1+J*f/5.85* 10^5) ((1+J*f/5.85* 10^6)The high 3 db frequency of an amplifier will be approximately-a) 5850 kHzb) 585 kHzc) 5850 Hzd) 585 Hz14. An open loop transfer function is given byK(S+3)/S(S+5) Its loci will be-15. . The output signals amplitudes for 1's and 0's in an ADM transmission systems are
a) Fixed and the repetition rate is also fixedb) Fixed but the repetition rate is variablec) Variable and the repetition rate is also variabled) Variable but the repetition rate is fixed16. Microwave link repeaters are typically 50km apart a) Because of atmospheric attenuationb) Because of Output tube power limitationsc) Because of the earth's curvatured) To ensure that the applied ac voltage is not excessive17. . The amplifier inserted at intervals to amplify the signal and compensate for transmission loss on the cable are called- a) line amplifierb) equalizing amplifiers c) compradors d) repeaters. 18. Diversity reception in used to- a) increase receiver sensitivityb) improve receiver selectivity c) overcome degrading effect of fading d) overcome degrading effect of receiver detuning 19. Mark out transferred electron device in the following- a) BARITT divedb) IMPATT dived c) Gunn divde d) Step recovery diode 20. In the output of a normal monochrome receiver video detector voltages, which are not found, are - a) syneb) video c) sweep d) sound 21. The HV anode supply for the picture tube of TV receiver is generated in the- a) mains transformerb) vertical output stagec) horizontal output staged) horizontal deflection oscillator22. In antenna measurements using two aperture antennas of dimensions D1 and D2 , minimum separation between the two should be (x is free space wavelength of radiation usesa) (D1+D2)/2xb)(D1^2.D2^2)/2xc)(D1^2+D2^2)/xd)(D1^2+D2^2)/8x23. . The frquency range for satellite broad casting is a) 30 MHz - 300MHzb) 30 MHz - 3 GHzc) 3 GHz - 30 GHzd) 30 GHz - 300 GHz24. Iris is used to ?a) Over come power lossb) Over come bending effectc) Over come mismatch errord) Over come twist effect25. In schotty barrier diode current flows because of a) Majority carriersb) Minority carriersc) Majority and minority carriersd) None26. . Which antennas are used in microwave communication a) long wave antennas b) Rhombic antennasc) Parabolaidal antennasd) All of above27. Among translator & time of sight system capacity a) Of translator is moreb) Of line of sight is morec) Having equal capacityd) No relation such as28. No of T-state required for memory read or write operation- a) 2 b) 3 c) 4 d) 6 29. In 8089 data transfer operation which flag get affected)- a) 3140 flog. b) carry flog c) sign flog. d) none 30. In flowchart which figure represents process like subroutine- 31. The storage and retrieval of data on stacks should follow sequence-
a) last in first out b) first in first out c) random in random out d) none 32. . While executing program microprocessor checks INTR line clearing- a) each instruction b) after interval of two instruction c) after a subroutine d) at the end of program. 33. In which error check technique of data communication 2's complement of all bytes of data is transmitted with data- a) Even parity b) odd parity c) check scans d) cyclic redundancy 34. . Program execution hierarchy decides which operator- a) is most importantb) is used firstc) is fastestd) operators on largest number35. (375)10 = (----)8 a) 550b) 557c) 567d) 57736. To obtain 2048 8 memory using 128 8 memory chip how many IC required- a) 2b) 4c) 8d) 1637. A Decimal no. 17 can be converted in binary, the binary no. will be.- a) 10001b) 01110c) 00111d) 1110038. Is the Universal logic gate- a) ANDb) ORc) NANDd) X-OR39. A monostable state in multivibrator means- a) which returns itself to its single stable stateb) the state used only once in circuitc) the state of circuit can not get changedd) the state of circuit always changing40. For designing binary counter which flip flop is preferred - a) T FFb) SR FFc) D FFd) JKFF
