NYC RMO EXAM, CHAPTER 25 (Thermostatic Expansion Valves) questions with verified answers

NYC RMO EXAM, CHAPTER 25 (Thermostatic
Expansion Valves) questions with verified answers
25.01.) TEVs are usually rated by? Ans✓✓-Tons of refrigeration


25.02.) Which of the following does a TEV control? Ans✓✓-Flow of refrigerant to
the evaporator


25.03.) When installing a TEV sensing bulb, where should it be placed to assure
correct operation? Ans✓✓-At the end of the evaporator


25.04.) Which of the following operational conditions does the TEV attempt to
maintain at a constant value? Ans✓✓-Superheat temperature


25.05.) Upon inspecting a TEV installation, you find that the sensing bulb is
clamped to the evaporator directly after the valve. Which of the following would
you expect to take place? Ans✓✓-The valve will not feed enough refrigerant and
the coil will starve


25.06.) A finned coil evaporator is equipped with a TEV. The bulb of this valve is
properly clamped to the end of the coil. In what condition should the suction
vapor leaving the coil be? Ans✓✓-5 to 10 degrees F (superheated)


25.07.) In a Freon air conditioning system, the bulb of a TEV has been clamped at
the midpoint of the evaporator being served. How will this affect the coil
operation? Ans✓✓-The refrigerant leaving the coil will be excessively
superheated