Suppose the Engel curve for a particular commodity is given by:
What is the income elasticity for this particular product?
A) 0.333
B) 0.5
C) 0.364
D) 1.77
C) 0.364
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Which of the following describes a brake in which the retarding force is the upstroke of the engine piston on its compression stroke?
A. exhaust brake B. service brake C. external compression brake D. internal compression brake
What are two differences between R404A and R477 (CO2) piping for the same evaporator temperature and system Btuh capacity?
a. R404A piping must withstand lower pressure and is a smaller diameter than R477 b. R477 piping must withstand higher pressure, but has smaller diameter than R404A
A screw stem valve used to drain tanks and water heaters is a
A. sill cock B. hydrant C. non-freeze wall hydrant D. boiler drain
What does the pressure drop across the coaxial coil tell the technician?
A) The water flow through the system B) The amount of refrigerant charge C) A pressure drop across the coaxial coil indicates a refrigerant restriction. D) A pressure drop across the coaxial coil indicates a restriction in the water loop.