Determine whether or not each of the following continuous- and discrete-time signals is periodic. If yes, determine its fundamental period.

(a) x(t) = e j(πt−1).
(b) x(t) = cos(2t − π3)

A Carnot heat engine receives heat from a reservoir at 900$^\circ{}$C at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 27$^\circ{}$C. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -5$^\circ{}$C and transfers it to the same ambient air at 27$^\circ{}$C. Determine (a) the maximum rate of heat removal from the refrigerated space and (b) the total rate of heat rejection to the ambient air. Answers: (a) 4982 kJ/min, (b) 5782 kJ/min

A large dynamometer operates a pump that circulates a viscous fluid through a restrictive fluid circuit. ... Under Steady Operating Conditions, Heat Loss From The Fluid Is Measured As 150 KW When The Shaft Is Rotating At 1000 Rpm, And 275 KW When The Shaft Speed Increases To 2000 Rpm. The Pump Efficiency Varies ...

Explanation: