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

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 ️️ -Evaporative condensers An important feature of a refrigerant receiver, in the case where the liquid line to the evaporator comes out of the top of the receiver, is a: - Correct Answer ️️ -Dip tube A pressure regulator is constructed so that a rise in ____________ steam pressure reduces off the inlet flow of supply steam. - Correct Answer ️️ -Downstream A vacuum breaker is used to avoid which of the following - Correct Answer ️️ - Negative gauge pressure