IB Assistant Central Intelligence Officer question set 3

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 21 to 30 (part 3)

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.

21. While an oscilloscope gives a display of signal amplitude versus time, spectrum analyzer presents on the CRT display a graph of signal amplitude versus i) frequency ii) phase iii) amplitude of reference signal iv) none of these

22. A series combination of a resistance R1 ohm and another resistance which is further a parallel combination of R1 ohm and R2 ohm is given by i) R1+2R2 ii) 2(R1.R2)/(R1+R2) iii) 2R1+R2 iv) (R21+ 2R1R2)/(R1+R2)

23. Both Thevenin and Norton equivalents of a given network will produce the same current through any load across given terminal i) the statement is true ii) in some cases iii) the statement is false iv) none of these

24. Referring to the atomic structure, a semiconductor material has i) eight electrons in the out most orbit ii) four electrons in the out most orbit iii) two electrons in the out most orbit iv) none of these

25. A P type semiconductor material is formed by adding the semiconductor controlled amounts of i) some prevalent impurity ii) arsenic iii) some trivalent impurity iv) none of these

26. One of the examples of an active device is a/an i) electric bulb ii) transformer iii) loudspeaker iv) silicon controlled rectifier(SCR)

27. A germanium atom contains i) four protons ii) four valence electrons iii) only two electron orbits iv) five valence electrons

28. A zener diode i) has a high forward voltage rating ii) has sharp breakdown at low reverse iii) is useful as an amplifier iv) has a negative resistance

29. The arrowhead on the transistor symbol always points in direction of i) hole flow in the emitter region ii) minority carrier flow in the emitter region iii) electron flow in the emitter region iv) majority carrier flow in the emitter region

30. The input output signals of a common emitter amplifier are i) in same phase ii) out of phase iii) in opposite phase iv) none of these

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