| 1 |
The Boolean expression AC + B
is equivalent to |
| Options |
| A)
C + B
+ AC |
B)
C + AC + B
+
C
|
| C) AC + B
+
C + ABC |
D) ABC +
B
+ AB
+ AB
|
|
|
|
| Correct Answer |
D |
|
| 2 |
The resistivity of a uniformly doped n-type
silicon sample is 0.5 W-cm. If the
electron mobility (mn) is 1250 cm2/V-sec
and the charge of an electron is 1.6 x 10-19 Coulomb, the
donor impurity concentration (ND) in the sample is |
| Options |
| A) 2 x 1016/cm3 |
B) 1 x 1016/cm3 |
| C) 2.5 x 1015/cm3 |
D) 2 x 1015/cm3 |
|
|
|
| Correct Answer |
B |
|
| 3 |
Consider the following statements S1 and S2.
S1: The b of a bipolar
transistor reduces if the base width is increased.
S2: The b of a bipolar transistor
increases if the doping concentration in the base is increased.
Which one of the following is correct?
|
| Options |
| A) S1 is FALSE and S2 is TRUE |
B) Both S1 and S2 are TRUE
|
| C) Both S1 and S2 are FALSE |
D) S1 is TRUE and S2 is FALSE |
|
|
|
| Correct Answer |
D |
|
| 4 |
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
|
| Options |
| A) - 90° |
B) 0° |
| C) 90° |
D) - 180° |
|
|
|
| Correct Answer |
A |
|
| 5 |
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
|
| Options |
| A) 2.7 mm |
B) 0.3 mm.
|
| C) 2.25 mm |
D) 0.75 mm |
|
|
|
| Correct Answer |
B |
|
| 6 |
A master-slave flip-flop has the characteristic
that
|
| Options |
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 |
|
|
|
| Correct Answer |
C |
|
| 7 |
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)
|
| Options |
| A) 10 mA |
B) 100 mA |
| C) 10 A |
D) 1.59 mA |
|
|
|
| Correct Answer |
A |
|
| 8 |
The phase velocity of an electromagnetic wave
propagating in a hollow metallic rectangular waveguide in the TE10
mode is |
| Options |
| 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 |
|
|
|
| Correct Answer |
D |
|
| 9 |
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
|
| Options |
| A) 2N0B |
B) 4N0B
|
| C) eN0B |
D) 16 N0B |
|
|
|
| Correct Answer |
B |
|
| 10 |
The cascade amplifier is a multistage
configuration of |
| Options |
| A) CC-CB |
B) CE-CB |
| C) CB-CC |
D) CE-CC |
|
|
|
| Correct Answer |
B |