CSLB C20 Trade Tougher Questions and Answers with Complete Solutions

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CSLB C20 Trade Tougher Questions and Answers with Complete Solutions Duct systems should be installed according to ____ Standards ✔✔SMACNA The type of flue pipe used on gas 80% standard furnace ... venting systems serving gas fired systems ✔✔Type B-Vent Which type of gauge would you use for very high vacuums? ✔✔McLeod type gauge How many BTUs are equal to one kilowatt hour ✔✔3,414 BTU When adjusting gas fired furnaces above 2000 feet, the BTU per hour input should be reduced 4% for each _____ feet above sea level. ✔✔4% for every 1,000 feet How are residential furnace blower motors classified ✔✔by starting method What is the equation for determining heat loss through a material ✔✔Q = U times A times TD What is the overfire rating on a small draft hood ✔✔0.02 inches what is the equation for determining minimum size air supply for a blower type furnace ✔✔2 divided by 1000 times the BTU of the furnace what is the equation for determining minimum size air supply for a gravity type furnace ✔✔7 divided by 1000 times the BTU of the gravity furnace the type of bub that measures evaporative cooling ✔✔wet bulb the heating value of natural gas is ✔✔1100 BTU per cubic foot Silver solder starts to flow at or above ✔✔1150 degrees fahrenheit how high must a 12"diameter flue pipe project above a pitched roof line ✔✔2 feet Ducts conveying flammable dusts must have a clearance from combustible materials of not less than how many inches ✔✔18 inches A furnace installed in an attic must have a minimum access opening of ✔✔22 by 30 inches The Cal Osha exposure limit for asbestos is ____ f cc ✔✔0.1 f cc If the asbestos content of a material encountered at a work site exceeds 1%, what should you do? ✔✔put up a caution sign and close off the affected area On a residential system that uses more than 50 pounds of freon, what is the maximum annual leakage rate allowed before repairing the leak is mandatory. What is it for commercial? ✔✔15%, 35% what is the minimum safe landing clearance diameter for a helicopter? ✔✔200 feet what is the max flexible connector you can use for a heating furnace ✔✔3 feet what is the boiling point of R22 at atmospheric pressure? ✔✔negative 41 degrees what is the minimum clearance between an air duct an a rafter ✔✔1 inch why should there be clearance between an air duct and a rafter? ✔✔fire safety purposes for most refrigerants, is the the boiling point above or below zero degrees Fahrenheit? ✔✔below [Show More]

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