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1.

A rectangular hollow metal waveguide has dimensions a= 2.29 cm and b = 1.02 cm. Microwave power at 10 GHz is transmitted through the waveguide in the TE₁₀ mode.
(a) Calculate the cut-off wavelength and the guide wavelength for this mode.
(b) What are the other (TE or TM) modes that can propagate through the waveguide?
(c) If a = b = 2.29cm, What are the modes which can propagate through the waveguide?
[5 marks]

last reply by CpjJwWHV • 12 years ago • asked in Electronics and Communication Engineering, 2001

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2.

A medium has breakdown strength of 16 KV/m r.m.s. Its relative permeability is 1.0 and relative permittivity is 4.0 A plane electromagnetic wave is transmitted through the medium. Calculate the maximum possible power flow density and the associated magnetic filed.
[5 marks]

asked in Electronics and Communication Engineering, 2001

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3.

A system of three electric charges lying in a straight line is in equilibrium. Two of the charges are positive with magnitudes Q and 2Q, and are 50 cm apart. Determine the sign, magnitude and position of the third charge.
[5 marks]

asked in Electronics and Communication Engineering, 2001

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4.

A periodic signal g(t) is shown in Figure. Determine the PSD of g(t).

[5 marks]

asked in Electronics and Communication Engineering, 2001

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5.

A baseband signal g(t) bandlimited to 100 Hz modulates a carrier of frequency f₀ Hz. The modulated singal g(t)cos2πf t is transmitted over a channel whose input x and output y are related by y = 2x + x². The spectrum of g(t) is shown in Figure. Sketch the spectrum of the transmitted signal and the spectrum of the received signal.

[5 marks]

asked in Electronics and Communication Engineering, 2001

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6.

The periodic modulating signal m(t) is shown in Fig. Using Carson’s rule estimate B_FM (bandwidth of the FM signal) and B_PM(bandwidth of the PM signal) for K_f = π×104 and K_p= π/4. Assume the essential bandwidth of m(t) to consist only up to and including the third harmonic.

[5 marks]

asked in Electronics and Communication Engineering, 2001

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