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Electronics & Communication

1 A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz 
and 200 Hz. The approximate phase of the system-response at 20 Hz is 
A) 
- 90°
B) 0°
C) 90° 
D) - 180°
Answer : (A)

2 In an 
abrupt p-n junction, the doping concentrations on the p-side and n-side are NA = 
9x 1016/cm3 and ND = 1 x 1016/cm3 respectively. The p-n junction is reverse 
biased and the total depletion width is 3 m m. The depletion width on the p-side 
is 
A) 2.7 mm 
B) 0.3 mm. 
C) 2.25 mm 
D) 0.75 mm
Answer : 
(B)

3 A master-slave flip-flop has the characteristic that 

A) change in the input immediately reflected in the output
B) change 
in the output occurs when the state of the master is affected
C) change in 
the output occurs when the state of the slave is affected
D) both the master 
and the slave states are affected at the same time
Answer : 
(C)

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 
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)

6 Noise with uniform power spectral 
density of N0W/Hz is passed through a filter H (w) = 2 exp(-jwtd) followed by an 
ideal low pass filter of bandwidth BHz. The output noise power in Watts is 

A) 2N₀B 
B) 4N₀B
C) eN₀B 
D) 
16 N₀B
Answer : (B)

7 The cascade amplifier is a 
multistage configuration of
A) CC-CB 
B) CE-CB
C) CB-CC 
D) 
CE-CC
Answer : (B)

Edited by Priya - 04Jan2007 at 4:31pm


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