Question 50Refrigeration & AC - QMED

The correct answer is B. The key requirements for the evaporator coil are a 2 psi pressure drop, the need for externally adjustable superheat, and a replaceable power element. Based on the illustration, option B is the appropriate thermal expansion valve as it features an externally adjustable superheat and a replaceable power element, which meets the specified criteria. The other options would not be suitable - option A lacks the externally adjustable superheat feature, option C does not have a replaceable power element, and option D is not designed for the 2 psi pressure drop requirement.