21. how long can food that requires time-temperature control be left in the danger zone?
a. a maximum of 1 hour
b. a maximum of 2 hours
c. a maximum of 3 hours
d. a maximum of 4 hours

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.