Among the refrigerants listed, select the best one for a refrigeration cycle that operates with a condenser temperature of t = +30°c and an evaporator r50 ): 4 r32 ): 22 r14 ): t 4 r170 h ): t 26 t = −161.5°c, t = −82.6 = −51.7°c, t = +78.1°c t = −121.8°c, t = −45.6°c = −88.6°c, t = +32.2°c temperature of t = −31.7°c.

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

Air at a pressure of 1atm and a temperature of 40 c is in parallel flow over the top surface of a flat plate that is heated to a uniform temperature of 120 c. the plate has a length of 0.40m (in the flow direction) and a width of 0.15m. the reynolds number based on the plate length is 50, 000. what is the rate of heat transfer from the plate to the air? if the free stream velocity of the air is doubled and the pressure is increased to 10 atm what is the rate of heat transfer?