What is the purpose of the white ceramic pieces on the strip heaters?
What will be an ideal response?
They insulate the heater wire from the metal frame supporting it.
You might also like to view...
In the following take 
and 
for nitrogen gas:
(a) Three pound moles of nitrogen at 70(°F), contained in a rigid vessel, is heated to 350(°F). How much heat is required if the vessel has a negligible heat capacity? If it weighs 200(lbm) and has a heat capacity of 
, how much heat is required?
(b) Four pound moles of nitrogen at 400(°F) is contained in a piston/cylinder arrangement. How much heat must be extracted from this system, which is kept at constant pressure, to cool it to 150(°F) if the heat capacity of the piston and cylinder is neglected?
Which of the following occurs as soon as a heating thermostat is closed?
a. The flame rollout switch opens. b. The blower fan starts c. The inducer fan starts. d. The inducer pressure switch opens
In the “real world” how often is it practical to replace the oil in a vacuum pump?
a. After every 5 evacuations or after each evacuation of highly contaminated systems. b. When the oil turns white from moisture or dark amber from removing acid. c. Vacuum pumps must always have their oil changed after each use.
Communicating systems operate by
A) sending serial computer communications down a small number of wires B) sending control signals over telephone wires C) sending 24 volts to each component that must be energized D) connecting to the manufacturers web site via satellite connections