HVAC Star Exam Correct Questions & Answers!

In a chiller, the refrigerant boils by ___________. - ANSWER absorbing heat from the water passing through it The four main components of a refrigeration system are - ANSWER compressor, condenser, evaporator, & metering device The difference between a contactor and a motor starter is: - ANSWER overload protection If refrigerant condenses at a temperature of 105 degrees F and the water leaves the condenser at a temperature of 95 degrees F, the ___________. - ANSWER condenser approach temperature will be 10 degrees The device that is incorporated into a vacuum steam heating system to protect the vacuum pump from creating too low (deep) a vacuum is a: - ANSWER vacuum breaker The approach temperature for the evaporator is: - ANSWER the difference in the refrigerant boiling temperature and the leaving-water temperature The rotation of a three-phase motor can be reversed by interchanging: - ANSWER any two leads Absolute zero is: - ANSWER -460 degrees F When a three-phase motor single-phases, it: - ANSWER draws power from only one phase If you want to replace a defective capacitor but the only replacements you can find do not have enough capacitance, you can increase their capacitance by: - ANSWER connecting two or more capacitors in parallel A single-phase motor in which the starting capacitor remains connected when the motor runs is called a: - ANSWER permanent-split capacitor motor When using a thermostatic expansion valve with a __________ charged element, hunting can be considerably reduced. - ANSWER cross A hand placed near a hot stove or fireplace is quickly heated by: - ANSWER radiation When an object is refrigerated: - ANSWER heat is removed from it. The refrigerant line that connects the condenser to the metering device is ___________ line. - ANSWER liquid In