IB question set 4

IB Examination 2013 Name of the Examination: Assistant Central Intelligence Officer Grade -II (Technical & Wireless Telegraphy) Examination -2013 Total Marks : 100 Date of Examination : 24/03/2013(March 24, 2013) Question No 31 to 40 (part 4)
Instructions : 1. Each question is followed by four alternatives (i), (ii), (iii) and (iv). Only one alternative is the correct answer, which should be marked by darkening the circle completely with BLUE BALLPOINT PEN only OMR response sheet provided separately. 2. Rough work, if any may be done on the question paper and at all on the OMR response sheet.
31. An amplifier circuit of voltage gain 100, gives 2V output. The value of input voltage is i) 200 V ii) 50 V iii)20 mV iv) 2 mV
32. The vpltage gain of an amplifier is 100. On applying negative feedback with β=0.03, its gain will reduce to i) 70 ii) 99.97 iii) 25 iv) 3
33. The major difference between JFET and MOSFET is i) MOSFET has large input resistance ii) JFET has large input resistance iii) JFET has smaller gain iv) none of these
34. A logic circuit that may give square waveform at the output for a sinusoidal input is the i) Schmitt Trigger ii) Monostable Multivariator iii) Bistable multivariator iv) Astable multivibrator
35. Which of the following is a voatile memory i) Hard Disk ii) Floppy Disk iii) Magnetic Tape iv) RAM
36. As compared to 16 bit micro processor, 8 bit micro processor are limited in i) Speed ii) Data handling capability iii) directly addressable memory iv) All of these
37. In a communication system, noise is most likely to affect the signal i) at the transmitter ii) in the channel iii) in the information source iv) at the destination
38. Indicate the false statement. Modulation is used to i) reduce the bandwidth ii) separate the diffrening transmissions iii) ensure that intelligence may be transmitted over long distances iv) allow the use of practicable antennas
39. A carrier is simultaneously modulated by two sine wavs with modulation indeces of 0.3 and 0.4; the total modulation index i) is 1 ii) cannot be calculated unless the phase relations are known iii) is 0.5 iv) is 0.7
40. If in a modulating system, doubling the modulating frequency and reducing the modulation index by half, leaves the modulating voltage unchanged, which system of modulation is being used i) amplitude modulation ii) phase modulation iii) frequency modulation iv) all of the above

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