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Electronics and Communication Signal Processing Difficulty: Medium

Which one of the following systems is a causal system? When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________. A thermistor has a resistance temperature coefficient of -2% over a temperature range of 25°C to 50°C. If the resistance is 50 Ω at 25°C. What is the resistance at 45°C ? Consider a message signal whose spectrum is given by $$M\left( f \right) = 1 - \frac{{\left| f \right|}}{{{{10}^4}}},\,\left| f \right| \leqslant {10^4}$$ and zero elsewhere. The message signal amplitude modulates a carrier f c = 1 MHz. The bandwidth of the modulated signal is: Determine the bandwidth of the FM signal for 5kHz audio signal modulated by a carrier of 50 MHz causing a frequency deviation of 25 kHz?