(i) Modulation index:
(ii) Plate current efficiency. The D.C plate current under unmodulated condition is 20A, the unmodulated output carrier power is 4.5KW, therefore the current is
and the efficiency
(iii) Carrier power under modulated condition is
(iv) Plate dissipation under unmodulated and modulated conditions:
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But carrier power under modulated condition should be P=20×150 since the modulated voltage is 150. What do you think?