The average value of a rectangular pulse wave is calculated as:
A) Vavg = 0.637 Vp. B) Vavg = Vbaseline + (duty cycle) × Vp.
C) Vavg = 1.57 Vp. D) Vavg = Vbaseline + Vp.
B
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Polished or plated pipe is removed or installed with a(n) _____ wrench to prevent damage to the pipe.
a. offset b. chain c. straight d. strap
Using the CFM per 100 sq ft method, a 1,600 sq ft house leaking 120 CFM has a leakage rate of:
A) 1,600/120 = 13 CFM per 100 sq ft. B) 1,600 - 120 = 1,480 CFM. C) 1,600 + 120 = 1,720 CFM. D) 120/16 = 7.5 CFM per 100 sq ft.
Clear water is observed dripping out from beneath the evaporator. Technician A says that is normal. Technician B says that the evaporator housing is defective and should be replaced. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
In order for combustion to occur, there must be _____
a. fuel, CO2, and ignition b. radiation, conduction, and convection c. fuel, oxygen, and aldehyde d. fuel, heat, and oxygen