Why do commercial refrigeration systems need a defrost system?

What will be an ideal response?


Since most refrigeration systems operate at evaporating temperatures below 32°F, frost will accumulate on an evaporator surface. This frost must be removed on a regular basis; otherwise it will begin to insulate the surface of the evaporator and prohibit the transmission of heat from the product to the refrigerant within the evaporator.

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If the vector diagram of two AC waveforms is a right angle, then the waves _____.

a. are in phase b. are 90° out of phase c. have the same frequency d. have the same peak voltage

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Which of the following is an advantage of mechanical filters?

A. New technology B. Extreme flexibility C. Excellent rejection characteristics D. Compatible with larger equipment

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Technician A says that the 3 wires on the TP sensor include a 5-volt reference voltage from the PCM Technician B says that a TP sensor is a three-wire variable resistor called a rheostat. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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Which of the following would be considered one of the permittivities of a dielectric material?

A. Gallium B. Copper C. Air D. Silicon

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