Which of the following refrigerants poses the greatest threat to the ozone layer?
A) CFC
B) HCFC
C) HFC
D) Ammonia
Answer: A
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Determine the change in specific enthalpy for air that is heated from 25°C to 1000°C considering (a) the specific heats to be constant, with a value taken at 25°C, (b) the specific heats to be constant, with a value taken at 1000°C (cp = 1.185 kJ/kg-K), (c) the specific heats to be constant, with a value taken at 500°C, and (d) considering the specific heats to be variable.
Given: T1 = 25°C; T2 = 1000°C; Air What will be an ideal response?
____________ microbes can grow with or without free oxygen.
A. Aerobic B. Facultative C. Anaerobic D. Saprophytic
Sensors for the mixing valve control are located:
A) Outside the building, on the supply line, and on the boiler. B) On the supply line and on the boiler. C) Outside the building and on the supply line. D) Outside the building and on the boiler.
If the resonant frequency is near the harmonic voltage, the resultant harmonic current can _____.
a. decrease the voltage b. increase the impedance c. overheat the windings d. blow the capacitor fuses