1) If a linear uniform array consists of 9 isotropic elements separated by λ/4, what would be the directivity of a broadside array in dB?
a. 6.53 dB
b. 7.99 dB
c. 8.55 dB
d. 9.02 dB
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Answer
Explanation
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ANSWER: 6.53 dB
Explanation:
No explanation is available for this question!
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2) By how many times is an input impedance of a folded dipole at resonance greater than that of an isolated dipole with same length as one of its sides?
a. 2
b. 3
c. 4
d. 6
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Answer
Explanation
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ANSWER: 4
Explanation:
No explanation is available for this question!
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3) How do the elements of an active region behave?
a. Inductive
b. Capacitive
c. Resistive
d. None of the above
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Answer
Explanation
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ANSWER: Resistive
Explanation:
No explanation is available for this question!
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4) If the length of elements of an array is greater than λ/2, which will be the operating region of an array?
a. Transmission line region
b. Active region
c. Reflective region
d. All of the above
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Answer
Explanation
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ANSWER: Reflective region
Explanation:
No explanation is available for this question!
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5) What kind of beamwidth is/are produced by Chebyshev arrays for given side lobe level (SLL)?
a. Widest
b. Narrowest
c. Both a and b
d. None of the above
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Answer
Explanation
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ANSWER: Narrowest
Explanation:
No explanation is available for this question!
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6) If the elements of a binomial array are separated by λ/4, how many shape patterns are generated with no minor lobes?
a. 2
b. 4
c. 8
d. 16
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Answer
Explanation
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ANSWER: 8
Explanation:
No explanation is available for this question!
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7) Which among the following is regarded as a condition of an ordinary endfire array?
a. α < βd
b. α > βd
c. α = ±βd
d. α ≠ ±βd
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Answer
Explanation
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ANSWER: α = ±βd
Explanation:
No explanation is available for this question!
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8) In broadside array, all the elements in the array should have similar _______excitation along with similar amplitude excitation for maximum radiation.
a. Phase
b. Frequency
c. Current
d. Voltage
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Answer
Explanation
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ANSWER: Phase
Explanation:
No explanation is available for this question!
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9) What is the nature of radiation pattern of an isotropic antenna?
a. Spherical
b. Dough-nut
c. Elliptical
d. Hyperbolic
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Answer
Explanation
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ANSWER: Spherical
Explanation:
No explanation is available for this question!
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10) In which kind of array configuration, the element locations must deviate or adjust to some nonplaner surface like an aircraft or missile?
a. Linear
b. Planer
c. Conformal
d. All of the above
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Answer
Explanation
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ANSWER: Conformal
Explanation:
No explanation is available for this question!
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