An LTI system has the transfer function (or frequency response)
H() = 1 /2 + 3j + (j) 2
a) What is the magnitude of H()?
b) What is the phase of H()?
c) Determine the impulse response of this system.
d) Find the differential equation between the input and output of this system.

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.