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Electronics and Communication Engineering
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Electromagnetic Field Theory
See What Others Are Saying!
Question
Calculate the directivity of an antenna for ?
E
= 30°, ?
H
= 60
Options
A. 46
B. 23
C. 50
D. 100
Correct Answer
23
Explanation
.
More questions
1. In an integral controller
Options
A. the output is proportional to input
B. the rate of change of output is proportional to input
C. the output is proportional to rate of change of input
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: the rate of change of output is proportional to input
Explanation:
Output is proportional to integral of input or rate of change of output is proportional to input.
2. Wave A = 100 sin ?
t
and wave B = 100 cos ?
t
. Then
Options
A. rms values of the two waves are equal
B. rms values of A is more than that of B
C. rms values of A is less than that of B
D. rms values of the two waves may or may not be equal
Show Answer
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Discuss
Correct Answer: rms values of the two waves are equal
Explanation:
Since peak values are equal, their rms values are equal irrespective of phase difference.
3. India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from
Options
A. USSR
B. USA
C. UK
D. UP
Show Answer
Scratch Pad
Discuss
Correct Answer: USA
4. For the system of the given figure the transfer function is
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
Transfer function =
.
5. Inverse Fourier transform of sgn (?) is
Options
A.
B. 1
C. U(
t
)
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
By duality Property.
6. The terminals of a power MOSFET are called
Options
A. emitter, base, collector
B. source, gate, drain
C. source, base, drain
D. emitter, gate, drain
Show Answer
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Discuss
Correct Answer: source, gate, drain
Explanation:
In a MOSFET terminals are source, gate, drain irrespective of rating.
7. A JK flip flop has
t
pd
= 12 ns. The largest modulus of a ripple counter using these flip flops and operating at 10 MHz is
Options
A. 16
B. 64
C. 128
D. 256
Show Answer
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Discuss
Correct Answer: 256
Explanation:
Number of flip-flops =
= 8.333 say 8
Modulus = 2
8
= 256.
8. In a two phase ac servomotor rotor resistance is R and rotor reactance is X. The speed curve will be linear if
Options
A.
B.
C.
D. X
2
= R
Show Answer
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Discuss
Correct Answer:
Explanation:
In a two phase servomotor
? < 1 so that torque speed curve is almost linear.
9. A uniform plane wave is one in which
Options
A.
x
= 0
B.
.
C.
and
are perpendicular
D.
and
lie in a plane
Show Answer
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Discuss
Correct Answer:
and
lie in a plane
Explanation:
For uniform plane wave, E and H must be in a plane but perpendicular to each other.
10. Regarding TASI which one of the following statements is wrong?
Options
A. It snatches the channel in his speech and may allocate it to another speaker needing it.
B. The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded.
C. It increases the overall utilization of the transmission channel
D. Intercontinental callers sometimes confuse the effects of TASI with the effects of satellite delay.
Show Answer
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Discuss
Correct Answer: The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded.
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