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Placement Paper Electronics Technical Questions 14 July 2012 by EIL

Details of Placement Paper Electronics Technical Questions 14 July 2012 by EIL conducted by EIL for job interview.
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Engineers India Limited (EIL) -2012 Latest Technical Questions with Answers for Electronics and Communication Engineering,EIL Fresh Graduate Trainee Recruitment - 2012 ,EIL Management Trainee - July 15th 2012,EIL Management trainee previous years question papers,EIL freesolved sample placement papers

1. The eigen values of a skew-symmetric matrix are
(A) always zero
(B) always pure imaginary
(C) either zero or pure imaginary
(D) always real

2.A function n(x) satisfied the differential equation (d2n(x)/dx2)-n(x)/L2=0 where L is a constant. The boundary conditions are: n(0)=K and n ( ∞ ) = 0. The solution to this equation is
(A) n(x) = K exp(x/L)
(B) n(x) = K exp(-x/ L )
(C) n(x) = K2 exp(-x/L)
(D) n(x) = K exp(-x/L)

3. For parallel RLC circuit, which one of the following statements is NOT correct?
(A) The bandwidth of the circuit deceases if R is increased
(B) The bandwidth of the circuit remains same if L is increased
(C) At resonance, input impedance is a real quantity
(D) At resonance, the magnitude of input impedance attains its minimum value.

4. At room temperature, a possible value for the mobility of electrons in the inversion
layer of a silicon n-channel MOSFET is
(A) 450 cm2/V-s
(B) 1350 cm2/V-s
(C) 1800 cm2/V-s
(D) 3600 cm2/V-s

5. Thin gate oxide in a CMOS process in preferably grown using
(A) wet oxidation
(B) dry oxidation
(C) epitaxial deposition
(D) ion implantation

6.For an N-point FFT algorithm with N = 2m which one of the following statements is TRUE?
(A) It is not possible to construct a signal flow graph with both input and output in normal order
(B) The number of butterflies in the mth stage is N/m
(C) In-place computation requires storage of only 2N node data
(D) Computation of a butterfly requires only one complex multiplication

7. Consider an angle modulated signal x(t) = 6cos[2πx106t+2sin(8000πt) +
4cos(8000pt)] V. The average power of x(t) is.
(A) 10W
(B) 18W
(C) 20W
(D) 28W

8.A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω /m. if the line is distortion less, the attenuation constant (in Np/m) is
(A) 500
(B) 5
(C) 0.014
(D) 0.002

9.The electric field component of a time harmonic plane EM wave traveling in a nonmagnetic loss less dielectric medium has an amplitude of 1 V/m. If the relative permitivity of the medium is 4, the magnitude of the time-average power density
vector (in W/m2) is

10.Suppose that the modulating signal is m(t) = 2cos (2π fmt) and the carrier signal is xC(t) = AC cos(2πfct), which one of the following is a conventional AM signal without over-modulation?
(A) x(t) = Acm(t) cos(2πfct)
(B) x(t) = Ac[1 + m(t)]cos(2πfct)
(C) x(t) = Ac cos(2πfct) + Ac/4m(t) cos(2πfct)
(D) x(t) = Ac cos(2πfmt) cos(2πfct) + Ac sin(2πfmt) sin(2πfct)