3. Which of the following demodulator (s) can be used for demodulating the signal x(t)=5(1+2cos200 nt)cos20000rt (a) Envelope demodulator (b) Square-law demodulator (c) Synchronous demodulator (d) None of the above 4. Consider an FM wave x(t)-cos[2nfct+B1sin2nf1t+B22nf2t] The maximum deviation of the instantaneous frequency from the carrier frequency fc is (a) B1f1+B2f2 (b) B1f2+B2f1 (c) ß1+B2 (d) f1+f2 5. A 10 MHz carrier is frequency modulated by a sinusoidal signal of 500 Hz, the maximum frequency deviation being 50 KHz. The bandwidth required. as given by the Carson's rule is

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.