Exam (elaborations) CSLB C20 TRADE TOUGHER

CSLB C20 TRADE TOUGHER EXAM QUESTIONS
AND ANSWERS 100% PASS

Duct systems should be installed according to Standards - CORRECT ANSWER --SMACNA



The type of flue pipe used on gas 80% standard furnace venting systems serving gas fired systems -
CORRECT ANSWER --Type B-Vent


Which type of gauge would you use for very high vacuums? - CORRECT ANSWER - -McLeod type
gauge


How many BTUs are equal to one kilowatt hour - CORRECT ANSWER - -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. - CORRECT ANSWER --4% for every 1,000 feet



How are residential furnace blower motors classified - CORRECT ANSWER - -by starting method



What is the equation for determining heat loss through a material - CORRECT
ANSWER -- Q = U times A times TD


What is the overfire rating on a small draft hood - CORRECT ANSWER - -0.02 inches



what is the equation for determining minimum size air supply for a blower type furnace -
CORRECT ANSWER --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 -
CORRECT ANSWER --7 divided by 1000 times the BTU of the gravity furnace


the type of bub that measures evaporative cooling - CORRECT ANSWER - -wet bulb



the heating value of natural gas is - CORRECT ANSWER - -1100 BTU per cubic foot