HVAC S.T.A.R EXAM QUESTIONS AND ANSWERS 100% PASS

HVAC S.T.A.R EXAM QUESTIONS AND ANSWERS 100% PASS The evaporator in a refrigeration system: - Correct Answer ️️ -Is the component where refrigerant boils and absorbs heat. The purpose of the compressor is to change ___________. - Correct Answer ️️ -Low- pressure, low-temperature vapor to a high-pressure, high temperature vapor A common refrigerant leak detection device is the: - Correct Answer ️️ -Halide torch. Copper-plating of compressor parts is: - Correct Answer ️️ -Caused by contaminants in the system. If not properly installed, a hot-gas muffler might trap: - Correct Answer ️️ -Oil. Unit ventilators are usually equipped with outside air dampers to: - Correct Answer ️️ - A. Partial Correct: Provide ventilation air during building occupancy B. Partial Correct: Comply with most local or state codes Face and bypass dampers should be adjusted to provide: - Correct Answer ️️ -Tight shut off to reduce the possibility of overcooling or overheating With belt driven equipment, alignment of the motor and driven equipment pulleys - Correct Answer ️️ -Is accomplished using a string or straight edge. To assist consumers in making an informed choice when purchasing unitary air conditioning equipment, the efficiency of such units is expressed as Energy Efficiency Ratio (EER or SEER) the units of which are: - Correct Answer ️️ -Btuh/watt Firestats located in the air stream of air handling units: - Correct Answer ️️ -A. Partially Correct: Are required in both the supply and return air streams B. Partially Correct: Should be the manual reset type C. Partially Correct: Should be nonadjustable A sleeve bearing would typically be used in a motor that: - Correct Answer ️️ - Operates with a light load and where noise is a factor. A bearing used on the bottom of a motor where the shaft is positioned vertically is called a ____________ bearing. - Correct Answer ️️ -Thrust To produce electromagnetism, relative motion is required between a magnetic field and a/an: - Correct Answer ️️ -Conductor Materials which do not allow their electrons to spin out of orbit easily are called: - Correct Answer ️️ -Insulators A battery is an example of a/an ____________ source. - Correct Answer ️️ -Direct current "Current flowing through a conductor in one direction for a split second, then in the opposite direction for a split second" would be a good definition of: - Correct Answer ️️ -Alternating current If a pressure gauge reads five psig at sea level elevation, the corresponding absolute pressure is ___________ psia. - Correct Answer ️️ -Fractional The portion of the electromagnetic spectrum to which solar collectors respond is _____ and near-infrared radiation. - Correct Answer ️️ -Visible light During winter, ________. - Correct Answer ️️ -Daylight is shorter and the Northern Hemisphere is angled away from the sun Unless equipped with OSHA or Canadian Standards Association (CSA) approved ground-fault circuit interrupters, portable electric lighting used in wet and-or other conductive locations as, for example, drums, tanks and vessels, shall be operated at ______ volts or less. - Correct Answer ️️ -12 Receivers are usually required in systems having: - Correct Answer