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Monday, October 10, 2011

GATE 2006 ECE Question Papes With Solutions

7. The values of voltage (VD ) across a tunnel-diode corresponding to peak and valley currents are and Vp and Vd respectively.The range of tunnel-diode voltage VD for which the slope of its I−Vd characteristics is negative would be
(A) VD< 0
(B) 0≤VD (C)Vp≤vD (D) VD≥Vv

8.The concentration of minority carriers in an extrinsic semiconductor under
equilibrium is:
(A) directly proportional to the doping concentration
(B) inversely proportional to the doping concentration
(C) directly proportional to the intrinsic concentration
(D) inversely proportional to the intrinsic concentration
9. Under low level injection assumption, the injected minority carrier current for an extrinsic semiconductor is essentially the
(A) diffusion current
(B) drift current
(C) recombination current
(D) induced current

10. The phenomenon known as “Early Effect” in a bipolar transistor refers to a
reduction of the effective base-width caused by
(A) electron-hole recombination at the base
(B) the reverse biasing of the base-collector junction
(C) the forward biasing of emitter-base junction
(D) the early removal of stored base charge during saturation-to-cutoff
switching.

20. A transmission line is feeding 1 Watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated
by the horn antenna into the free-space is:
(A) 10 Watts
(B) 1 Watt
(C) 0.1 Watt
(D) 0.01 Watt

22. For the function of a complex Variable W=lnZ
where, W=u+jv Z= x+jy ), the u = constant lines get mapped in Z-plane
as
(A) set of radial straight lines
(B) set of concentric circles
(C) set of confocal hyperbolas
(D) set of confocal ellipses

32. The first and the last critical frequencies (singularities) of a driving point
impedance function of a passive network having two kinds of elements, are a
pole and a zero respectively. The above property will be satisfied by
(A) RL network only
(B) RC network only
(C) LC network only
(D) RC as well as RL networks

38. The majority carriers in an n-type semiconductor have an average drift velocity v
in a direction perpendicular to a uniform magnetic field B. the electric field E
induced due to Hall effect acts in the direction
(A) v × B
(B) B × v
(C) along v
(D) opposite to v

43. A new Binary Coded Pentary (BCP) number system is proposed in which every
digit of a base-5 number is represented by its corresponding 3-bit binary code.
For example, the base-5 number 24 will be represented by its BCP code 010100.
In this numbering system, the BCP code 100010011001 corresponds to the
following number in base-5 system
(A) 423
(B) 1324
(C) 2201
(D) 4231

61. A zero-mean white Gaussian noise is passed through an ideal lowpass filter of
bandwidth 10 kHz. The output is then uniformly sampled with sampling period
ts= 0.03 msec. The samples so obtained would be
(A) correlated
(B) statistically independent
(C) uncorrelated
(D) orthogonal

62. A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the
most efficient source encoder would have average bit rate as
(A) 6000 bits/sec
(B) 4500 bits/sec
(C) 3000 bits/sec
(D) 1500 bits/sec

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