DC Third testing questions with correct answers

DC Third testing questions with correct answers The component in which liquid vapor by absorbing heat is called? -Correct Answer-Evaporator Select the best answer electrical grounding method? -Correct Answer-Metal stake drive 8 foot into the ground. A _____ valve should be used for throttling purpose? -Correct Answer-Globe What is the acceptable range for residual sodium sulfite in the boiler maintain? -Correct Answer-30-70 What is the BTU content of a gallon of #4? -Correct Answer-146,000 What does a zeolite water softener system use as a means of regeneration? -Correct Answer-Brine What are the 4 steps for a Zeolite Rejuvenation water softener process? -Correct Answer-Back wash Backwash, brine, rinse, service Where is medium temperature is liquid found? -Correct Answer-Condenser Where is high temperature vapor found? -Correct Answer-At the discharge of the compressor or condenser What stays are used to support the burner chamber in a scotch marine boiler? -Correct Answer-Diagonal Stays What type of safety valve is this? -Correct Answer-( Full) Crosby nozzle-type safety valve. Page 365 BOG What type of safety valve is this? -Correct Answer-( Full) Crosby nozzle-type safety valve. Page 365 BOG Where do you found superheat reading? -Correct Answer-Take suction line pressure Cross reference using a P/T Chart Get tail coil Temperature Subtract cross references temperature from tail coil temperature Result will be superheat Name the wire that connects all component of a system to a physical ground or water pipe? -Correct Answer-Grounding Electrode Conductor Where do get sub-cooling reading? -Correct Answer-Take liquid line pressure Cross reference to temperature using a P/T Chart Get liquid line temperature Subtract actual temperature from cross referenced temperature Result is sub-cooling On the boilers that have both Quick opening and Screw type blow down valves, the Quick opening valve must be located? -Correct Answer-Closest to the boiler and followed by the screw type valve High pressure boilers equipped with Quick opening and Screw type valves are blown down how? -Correct Answer-By opening the Quick opening valve first and closing it Last. Page 403 BOG ASME Code defines a slow opening valve as what? -Correct Answer-One requiring at least 5 full 360 degree turns between full open and close position. Page 374 A 300 Horsepower boiler operating at 100psi has an average load of 75% with 80% condensate return and 5% blow down. The treatment provides a chemical which costs $8.75 per gallon, and will treat 600 gallon. Find the amount of the chemical needed for the day period, and the cost of the chemical for a 30 days period? -Correct Answer-Water In = Water Out Makeup + Condensate Return = Evaporator + Blow Down