When a three way control valve reduces the flow through the coil by
A) sending some of the flow backwards in the direction it came from
B) opening and closing in pulses to vary the flow
C) closing and reducing the flow through the circuit
D) allowing some of the flow to bypass around the coil
D
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A(n) ____ occurs when a flame goes out with a loud snap or pop.
A. overheating B. flashback C. burn D. backfire
Manual screeds can be made of wood or _____.
a. steel b. aluminum c. magnesium d. fiber-reinforced plastic
A cylindrical wire of radius R elongates when subjected to a tensile force F. Let 
represent the initial length of the wire and let 
represent the final length. Young’s modulus for the material is given by
Assume that F = 800 ± 1 N, R = 0.75 ± 0.1 mm, = 25.0 ± 0.1 mm, and = 30.0 ± 0.1 mm.
a. Estimate Y, and find the uncertainty in the estimate.
b. Of the uncertainties in F, R,, and , only one has a non-negligible effect on the uncertainty in Y. Which one is it?
A balanced ventilation system:
A) Supplies and exhausts the same amount of air into the building. B) Can be installed with only a single central support in the middle. C) Can also provide heating and cooling. D) Uses a highly balanced blower wheel.