If you find a walk-in freezer coil completely frozen up what is the first thing to do?
a. Check system temperatures and pressures to see if it is a refrigeration problem.
b. Clear all ice off the evaporator before checking the refrigeration system.
c. Run the unit into defrost to see if a defrost component is the problem.
c. Run the unit into defrost to see if a defrost component is the problem.
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What type of sensor can be used to signal pressure values in truck electronic systems?
A. thermistor B. potentiometer C. variable capacitance D. inductive pulse generator
How can flash gas be spotted in a liquid line?
What will be an ideal response?
What advantage is there to maintaining a negative pressure on the heat exchanger?
A) Combustion air can only be drawn into the oil burner if a negative pressure is maintained B) Safety, to insure combustion products do not leak out into the air stream C) The vent will not work unless the heat exchanger is at a negative pressure D) The negative pressure helps draw in return air from the house, increasing efficiency
Assume that steady-state conditions exist in the circuit shown in Figure P5.28 at t < 0. Also assume:
V1 = 12V V2 = 5V L = 3H R1 = R2 = 2? R3 = 4? R3 = 29 k?
Find the Norton equivalent network seen by the inductor. Use it to determine the time constant of the circuit for t > 0.
