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19.

For the circuit shown in figure, determine the phasors E₂, E₀, I and I₁.

[5 marks]

asked in Electronics and Communication Engineering, 2001

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20.

In a uniform linear array, four isotropic radiating elements are spaced λ/4 apart. The progressive phase shift between the elements required for forming the main beam at 60° off the end-fire is: [2 marks]
(a) -π radians
(b) -π/2 radians
(c) -π/4 radians
(d) -π/8 radians

asked in Electronics and Communication Engineering, 2001

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21.

A medium wave radio transmitter operating at a wavelength of 492 m has a tower antenna of height 124m. What is the radiation resistance of the antenna? [2 marks]
(a) 25Ω
(b) 36.5Ω
(c) 50Ω
(d) 73Ω

asked in Electronics and Communication Engineering, 2001

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22.

A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected? [2 marks]
(a) 10%
(b) 25%
(c) 50%
(d) 75%

asked in Electronics and Communication Engineering, 2001

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23.

A material has conductivity of 10^-2 mho/m and a relative permittivity of 4. The frequency at which the conduction current in the medium is equal to the displacement current is [2 marks]
(a) 45 MHz
(b) 90 MHz
(c) 450 MHz
(d) 900 MHz

asked in Electronics and Communication Engineering, 2001

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24.

The PSD and the power of a signal g(t) are, respectively, S_g(ω) and P_g. The PSD and the power of the signal ag(t) are, respectively [2 marks]
(a) a²s_g(ω), a²p_g
(a) a²s_g(ω), ap_g
(a) as_g(ω), a²p_g
(a) as_g(ω), ap_g

asked in Electronics and Communication Engineering, 2001

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