The CAD cell is a safety device that uses which of the following to prove ignition?
A. heat in the flue
B. heat in the combustion chamber
C. light in the combustion chamber
D. heat in the blast tube
Answer: C
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Let X ~ U(a, b). Use the definition of the variance of a continuous random variable (Equation 2.38 or 2.39) to show that 
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What will be an ideal response?
Which basic principle is one that influences how all HVACR systems work?
A) Pressure affects boiling point and evaporation in an unpredictable way, so it must not be considered in HVACR equipment. B) A decrease in pressure increases the boiling point of liquid, the temperature at which a liquid turns to a gas. C) An increase in pressure can lower the boiling point of a liquid and change the temperature at which it turns to a gas. D) An increase in pressure can increase the boiling point of a liquid, the temperature at which a liquid turns to a gas.
The guaranteed range of measured values for a 68 k? resistor with a 5% tolerance is
A) 66,64 ? minimum; 69,36 ? maximum B) 64.6 k? minimum; 71.4 k? maximum C) 54.4 k? minimum; 81.6 k? maximum D) 61.2 k? minimum; 74.8 k? maximum
What is a circuit called that translates digital information from one form into another?
A) A register B) A flip-flop C) A decoder D) An adder