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1) If the radius of loop is λ/ 20 in a free space medium,what will be the radiation resistance of 8-turn small circular loop? a. 0.7883 Ω b. 50.45 Ω c. 123.17 Ω d. 190.01 Ω
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2) What is the far-field position of an electric short dipole? a. Along x-axis b. Along y-axis c. Along z-axis d. Along xy plane
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3) What would happen if the rms value of induced emf in loop acquires an angle θ = 90°? a. Wave is incident in direction of plane of the loop with induced maximum voltage b. Wave is incident normal to plane of the loop with no induced voltage c. Wave is incident in opposite direction of plane of the loop with minimum voltage d. None of the above
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4) 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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5) 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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6) 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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7) 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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8) Which angle of rhombic antenna represents one half of included angle of two legs of one wire? a. Apex angle b. Tilt angle c. Both a and b d. None of the above
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9) Which among the following is not a disadvantage of rhombic antenna? a. Requirement of large space b. Reduced transmission efficiency c. Maximum radiated power along main axis d. Wastage of power in terminating resistor
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10) Why are beverage antennas not used as transmitting antenna? a. Low radiation resistance b. Low radiation efficiency c. Both a and b d. None of the above
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