The aforementioned five message signals are modulated by a carrier, c(t) = 2 cos(1000πt). Please plot five modulated signals, mk(t)c(t) s. t. k ∈ {1, 2, 3, 4, 5}, in the time domain. Further, please plot the corresponding five spectra in the frequency domain. Consider the both cases of amplitude modulation (AM) schemes.(a) Double-sideband suppressed carrier (DSB-SC) AM (b) Single-sideband (SSB)-SC AM, in particular, focusing on the upper-sideband (USB) AM (c) m4(t) = 11(40.5) (d) m5(t) = 4(4-05)

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.