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Electronics and Communication Optical Communication Difficulty: Medium

A random variable X has $$\overline {\text{X}} $$ = 0 & $$\sigma _{\text{x}}^2$$ = 1. Form a new random variable Y = 2X + 1. The values of $$\overline {\text{Y}} $$ & $$\sigma _{\text{y}}^2$$ are: If a common emitter amplifier with an emitter resistance R e has an overall trans-conductance gain of -1 mA/V, a voltage gain of -4 and desensitivity of 50, then the value of the emitter resistance R e would be: In a typical 555 astable multivibrator circuit, if R A = R B = 2.2 kΩ and C = 0.1 µF then the free-running frequency is: A signal m(t), band-limited to a maximum frequency of 20 kHz is sampled at a frequency f s kHz to generate s(t). An ideal low pass filter having cut-off frequency 37 kHz is used to reconstruct m(t) from s(t). The minimum of f s required to reconstruct m(t) without distortion is Which statement is not correct? The given circuit is