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Exam Questions Papers
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Question
The amplitude of a pair of composite sinusoidal signal
y
(
n
) =
x
1
(
n
) +
x
2
(
n
) with
x
1
(
n
) = sin (5
p
n
)
x
2
(
n
) =
3
sin (5
p
n
) is __________ .
Options
A. 2
B. 3
C. 4
D. 1
Correct Answer
2
Explanation
Amplitude =
.
More questions
1. The number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about
Options
A. 10
B. 100
C. 500
D. 1500
Show Answer
Scratch Pad
Discuss
Correct Answer: 1500
2. What are the values of E
max
and E
min
displayed on the oscilloscope, when a 1 kV
P
-
P
carries is modulated to 50%?
Options
A. 2 kV, 0.5 kV
B. 1 kV, 0.5 kV
C. 0.75 kV, 0.25 kV
D. 0.5 kV, 1.5 kV
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.75 kV, 0.25 kV
Explanation:
E
max
- E
min
= 0.5 x 1 kV = 0.5 kV
2E
max
= 1.5 kVi, E
max
= 0.75 kV
E
min
= 0.25 kV.
3. For air filled circular waveguides
Options
A. the attenuation due to imperfect conducting walls is negligible
B. the attenuation due to imperfect dielectric is negligible
C. both the attenuation i.e. due to imperfect conducting walls and due to imperfect dielectric are significant
D. the total attenuation is almost zero
Show Answer
Scratch Pad
Discuss
Correct Answer: the attenuation due to imperfect dielectric is negligible
4. When .4546 E 5 and .5433 E 7 are to be added in normalized floating point mode
Options
A. none of the numbers is changed to any other form
B. .4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed
C. .5433 E 7 is changed to 54.33 E 5 and .4546 E 5 is not changed
D. both the numbers are changed and their exponents are made equal to 6
Show Answer
Scratch Pad
Discuss
Correct Answer: .4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed
Explanation:
Exponents are made equal and integer part is made zero.
5. A short circuited stub is preferred to an open circuited stub because an open circuited stub
Options
A. is more difficult to fabricate and construct
B. is made of transmission line of different
Z
0
C. is liable to radiate
D. is incapable of giving full range of reactance
Show Answer
Scratch Pad
Discuss
Correct Answer: is liable to radiate
6. As compared to an ordinary semiconductor diode, a Schottky diode
Options
A. has lower cut in voltage
B. has higher cut in voltage
C. lower reverse saturation current
D. both (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: has lower cut in voltage
Explanation:
Cut in voltage in Schottky diode is about 0.3 V as compared to 0.7 V in ordinary semiconductor diode.
7. For a superconductor, the relative permeability is
Options
A. zero
B. high
C. low
D. either low or high
Show Answer
Scratch Pad
Discuss
Correct Answer: zero
8. A rectangular wave guide has two stubs each of length
connected at the source end. The stubs are circuited. Then the stubs present
Options
A. an infinite impedance in shunt with line
B. an infinite impedance in series with line
C. a zero impedance in shunt with line
D. a finite impedance in shunt with line
Show Answer
Scratch Pad
Discuss
Correct Answer: an infinite impedance in shunt with line
9. Power monitor and reflectometer use the principle of
Options
A. directional coupler
B. klystron amplifier
C. Gunn diode
D. TWT
Show Answer
Scratch Pad
Discuss
Correct Answer: directional coupler
10. We can know the arrangement of atom in a material by studying electron diffraction pattern.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
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