A commonly used porous sound absorber is
A) aluminum foil.
B) oriented strandboard.
C) microperforated plastic.
D) gypsum board.
E) fiberglass.
E) fiberglass.
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Which of the following is a factor affecting the rate of water vapor diffusion through an insulating material?
a. Atmospheric pressure b. The sizes of water molecules c. The way it is measured d. The material it diffuses through
Which of the following refers to the condition in which two circuits share the energy of one of the circuits?
a. Reactance b. Mutual induction c. Magnetic induction d. Capacitance
What is the peak-to-peak voltage for the ac signal: 2 sin (5t) V?
A. 0 B. 10 C. 4 D. 5 E. 2
Valve spring inserts (shims) are designed to ________
A) Adjust the correct valve spring installed height B) Decrease installed height of the valve C) Increase installed height of the valve D) Decrease valve spring pressure to compensate for decreased installed height