Consider the LTI system with the impulse response: h(t)= â(t- T) where â(t) denotes the Dirac delta function. The output of this system when the input is x(t)= u(t) - u(t-2) where u (t) denotes the unit step function is given as:

a. y(t)= u(t-T) - u(t- 2)
b. y(t)= u(t-T) - u(t- 2- T)
c. y(t)= â(t- T)
d. y(t)= â(t)

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0