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

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How can flash gas be spotted in a liquid line?

What will be an ideal response?

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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

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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.

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