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Communication Systems
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Question
Which of the following is taken as reference antenna for directive gain?
Options
A. Half wave dipole
B. Elementary doublet
C. Isotropic
D. Infinitesimal dipole
Correct Answer
Isotropic
Explanation
Isotropic antenna is one which radiates equally in all directions. It is a standard reference antenna.
More questions
1. Soft iron is suitable for making temporary magnets.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
2. Hysteresis curve is associated with motion of domain walls.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
3. Slotted line can be used for measurement of high frequencies
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
4. A line of length slightly less than
and short circuited at far end behaves as
Options
A. inductance L
B. capacitance C
C. L and C in series
D. L and C in parallel
Show Answer
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Correct Answer: inductance L
5. At 0 K, silicon and germanium behave like monoatomic crystals.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
6.
Assertion (A):
For a solenoid having N turns,
.
Reason (R):
For all magnetic materials, B increases linearly with I.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true
Show Answer
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Discuss
Correct Answer: A is true but R is false
Explanation:
Increase of B with I is not linear. Hence R is false.
7. A ring counter with 5 flip flops will have
Options
A. 5 states
B. 10 states
C. 32 states
D. infinite states
Show Answer
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Correct Answer: 5 states
8. A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is
Options
A. 0.9
B. 10/9
C. 0.81
D. 0.1
Show Answer
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Discuss
Correct Answer: 10/9
Explanation:
Calling rate is the number of calls per subscriber.
9. If air pressure in a rectangular waveguide is increased the maximum power handling capacity
Options
A. is decreased
B. is increased
C. remains the same
D. may increase or decrease depending on pressure
Show Answer
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Correct Answer: is increased
10. In directional coupler of the given figure, the terms |
S
14
| and |
S
23
| of scattering matrix are nearly
Options
A. 1 each
B. 0.5 each
C. 0.1 each
D. 1 and 0.5 respectively
Show Answer
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Discuss
Correct Answer: 1 each
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