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1.

Refer given figure for following two questions. Assume D1 and D2 to be ideal diodes.
A. A
B. A
C. A
D. A

[1] Which one of the following statements is true?
[2] Values of Vo and I, respectively, are

asked in ECIL 2010 ECE

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2.

Which one of the following is not true for a step index optical fibre?
A. It can support multiple modes
B. HE11 mode is its lowest order mode
C. The refractive index of the cladding is higher than that of the core
D. At a given wavelength, single mode operation is possible by proper choice of core diameter, core and cladding refractive indices.

last reply by CpjJwWHV • 10 years ago • asked in ECIL 2010 ECE

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1.

The directivity of a half dipole antenna is
A. 1.0
B. 1.5
C. 1.64
D. 2

last reply by CpjJwWHV • 10 years ago • asked in ECIL 2010 ECE

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1.

Which one of the following statements is not true?
A. Antenna losses are taken into account in calculating its power gain
B. For an antenna which does not dissipate any power, the directive gain and the power gain are equal c) Directivity of an antenna is the maximum value of its directive gain
C. The directive gain of a Hertzian dipole is same in all direction
D.

asked in ECIL 2010 ECE

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2.

A Hertzian dipole antenna is placed at the origin of a coordinate system and it is oriented along z‐axis. In which one of the following planes the radiation pattern of the antenna has a circular shape?
A. x=0
B. y=0
C. z=0
D. ø=45

asked in ECIL 2010 ECE

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3.

A lossless air filled rectangular waveguide has internal dimensions of a cm * b cm. If a=2b and the cutoff frequency of the TE02 mode is 12 GHz, the cutoff frequency of the dominant mode is
A. 1 GHz
B. 3 GHz
C. 6 GHz
D. 9 GHz

asked in ECIL 2010 ECE

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