Indian Institute of Technology Kharagpur (IIT-K) 2006 M.E Electronics and Telecommunications Gate ece - Question Paper

11. The input impedance (Z,)and the output impedance (Z0)of an ideal transconductance
(voltage controlled current source) amplifier are
(A) Z,=0,Z0=0
(B) Z,=O,Z0=oo
(C) Z,=oo,Z0=O
(D) Z = 00, =
12. An n-channel depletion MOSFET has subsequent 2 points on its ID VGS curve:
(i) VGS = 0 at ID = l2mA and
(ii) VGS = —6 Volts at ID =
Which of the subsequent Q-points will provide the highest trans-conductance gain for
small signals?
(A) VGS = —6 Volts
(B) VGS = —3 Volts
(C) VGS = 0 Volts
(D) VGS = three Volts
13. The number of product terms in the minimized sum-of-product expression found
through the subsequent K-map is (where “d” denotes don’t care states)
1001
0d00
00d 1
1001
(A) 2
(B) 3
(C) 4
(D) 5
14. The Dirac delta function 8(t) is described as
(A) 8(t)=1 t=O.
L° otherwise
100 t=O
(B) 8(t)=.
LO otherwise
(C) 8(t) = = . and [8(t)dt = 1
L otherwise
(D) 8(t)=4°° t=O and [8(t)dt=1
L otherwise
15. The open-loop transfer function of a unity-gain feedback control system is provided by The
gain margin of the system in dB is provided by
(A) 0
(B) 1
(C) 20
(D)
16. The electric field of an electromagnetic wave propagating in the positive zdirection is provided
by
E=asin(at—flz)+asinot—flz+.
The wave is
(A) linearly polarized in the z-direction
(B) elliptically polarized
(C) left-hand circularly polarized
(D) right-hand circularly polarized
17. A transmission line is feeding one 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) one Watt
(C) 0.1 Watt
(D) 0.01 Watt
18. The eigenvalues and the corresponding eigenvectors of a two x two matrix are provided by
Eigenvalue Eigenvector
A1=8
A2=4 v2=[hil
The matrix is:
(A) six two L2 6
(B) six L6 4
(C) r L 2
(D) eight L8 4

Earning:   Approval pending.