Explain the difference between a basic zone control system and an advanced zone control system
What will be an ideal response?
Typically, more advanced systems these take advantage of equipment with variable speed ECM blower motors, modulating damper control, and staged capacity heating and cooling.
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A long cylindrical rod with a diameter of 3.0 cm is placed in the air. The rod is heated by an electrical current so that the surface temperature is maintained at 200°C. The air temperature is 21°C. Air flows over the rod with a convective heat transfer coefficient of 5.0 W/m2-K. Consider the emissivity of the rod to be 0.92. Ignoring the end effects of the rod, determine the heat transfer rate per unit length of the rod (a) via convection and (b) via radiation.
Given: Ts = 200°C = 473 K; Tf = Tsurr = 21°C = 294 K; h = 5.0 W/m2-K; ? =0.92; D = 3.0 cm = 0.03 m What will be an ideal response?
Technician A says that the appropriate source of service literature for Paccar MX engines is DAVIE. Technician B says that Paccar RAPIDO software should be used to troubleshoot Paccar MX engines. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Technician A says that hotter than recommended operating temperatures break down engine oil additives. Technician B says that hotter than recommended operating temperatures create varnish and hard deposits. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
What is the purpose of the venturi on a one-pipe venturi system?
A) The venturi creates a negative pressure at the main connection, drawing the necessary flow through the branch. B) The venturi separates air bubbles from the circulating water. C) The venturi mixes the supply and return water for more even temperatures. D) The venturi increases the pressure in the pipe to offset piping losses.