One disadvantage infrared thermometers is that they:
A) Are only available in limited quantities due to their specialized nature.
B) Are generally less accurate than dial type pocket thermometers.
C) Take longer to get a reading than other types of thermometers.
D) Can only read the temperature of objects.
Question 2
The operation of a thermostatic expansion valve can best be described as:
A) Spring pressure = bulb pressure + evaporator pressure.
B) Bulb pressure = evaporator pressure + spring pressure.
C) Bulb pressure = evaporator pressure = spring pressure.
D) Evaporator pressure = evaporator pressure + bulb pressure.
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