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Details of Placement Paper Electronics Technical Questions 14 July 2012 by EIL conducted by EIL for job interview.

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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

(A)1/30π

(B)1/60π

(C)1/120π

(D)1/240π

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)

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