An absorber material of relative permeability and relative permittivity of \varepsilon_r = \mu_r = 6 - j6 is coated on a perfectly conducting sheet and this combination is placed in free space as shown in the figure given below. A 500 MHz wave is incident on it normally from free space. Calculate the thickness of the absorber required to attenuate the reflected wave by 30 dB.

2Medium15 marks

Discuss the composition, source, types, environmental hazard and utility of fly ash.

3Medium20 marks

A 400 V, 3-phase, 50 Hz, star-connected synchronous motor has per phase synchronous impedance Z_s = (0.5 + j 3.5) \Omega. It is required to operate the motor as synchronous condenser to deliver 100 kVAr at rated voltage and no load. Find the motor current and excitation voltage under this condition. (Assume zero motor input power at no load)

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