A 3m2 black surface at 140 oC is losing heat to the surrounding air at 35oC by convection with a heat transfer coefficient of 16W/m2K and by radiation to the surrounding surfaces at 15oC. What is the total rate of heat loss from the surface? (a) 1987 W
(b) 2239 W
(c) 2348 W
(d) 3451 W
(e) 3811 W

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

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.

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.