What is required when installing a 90 percent furnace that is not required for an 80 percent furnace?
A) A drain for the condensate from the recuperative coil
B) An oxygen line for the combustion gas afterburner
C) A catalytic cell for the combustion gas catalytic converter
D) An extra-large supply duct to handle the extra heat output
A
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One drawback to using CO2 (R-744) as a refrigerant is ________.
A) CO2 system pressures are extremely high B) CO2 is hard to produce C) CO2 is damaging to plant life D) CO2 is flammable
The outcome of an electric shock is based on _____.
a. the amount of resistance in the circuit b. the amount of current that flows through the body c. the voltage level of the circuit d. whether the power is AC or DC
To eliminate the effect of an ideal voltage source, replace it with a(n) ______________
A. closed circuit B. total current C. open circuit D. short circuit
What type of generator generates equal intensities of all frequencies in the range of 20 to 20,000 Hz?
A. Signal B. Audio C. Pink noise D. White noise