1 The drain of an n-channel MOSFET is shorted to the gate so that VGS = VDS.
The threshold voltage (VT) of MOSFET is 1 V. If the drain current (ID) is 1 mA
for VGS = 2V, then for VGS = 3V, ID is
A) 2 mA
B) 3 mA
C) 9
mA
D) 4 mA
Answer : (D)
2 The first and the last critical
frequency of an RC-driving point impedance function must respectively be
A) a zero and a pole
B) a zero and a zero
C) a pole and a pole
D) a pole and a zero
Answer : (D)
3 In what range should
Re(s) remain so that the Laplace transform of the function e(a+2)t+5
exits?
A) Re (s) > a + 2
B) Re (s) > a + 7
C) Re (s) <
2
D) Re (s) > a + 5
Answer : (A)
4 A parallel plate
air-filled capacitor has plate area of l0-4 m2 and plate separation of 10-3 m.
It is connected to a 0.5 V, 3.6 GHz source. The magnitude of the displacement
current is (e0 = 1/36p x 10-9 F/m)
A) 10 mA
B) 100 mA
C) 10 A
D) 1.59 mA
Answer : (A)
5 For the polynomial P(s) = s5 +
s4 + 2s3 + 2s2 + 3s + 15, the number of roots which lie in the right half of the
s-plane is
A) 4
B) 2
C) 3
D) 1
Answer :
(B)
6 The phase velocity of an electromagnetic wave propagating in
a hollow metallic rectangular waveguide in the TE10 mode is
A) equal to
its group velocity
B) less than the velocity of light in free space
C)
equal to the velocity of light in free space
D) greater than the velocity of
light in free space
Answer : (D)
7 A device with input x(t)
and output y(t) is characterized by: y(t) = x2(t). An FM signal with
frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is
applied to this device. The bandwidth of the output signal is
A) 370 kHz
B) 190 kHz
C) 380kHz
D) 95kHz
Answer : (C)
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