Grade 1 Mechanical Technologist Study Guide Questions with well explained answers

Which welding process is most commonly used for small pipe maintenance welding? - AnswerOxyacetylene gas welding What is the proper definition of an engine? - Answer-It is a machine designed to convert energy into useful mechanical motion What is wet stacking and how can it be prevented? - Answer-It is unburned fuel collecting in the exhaust due to light or no load conditions. To check flywheel face runout, where should the dial indicator be positioned? - Answer-The base on the bell housing and pointer on the flywheel face. If a 38-tooth gear running at 360 rpm is driving another gear at 144 rpm, what is the number of teeth on the driven gear? - Answer-Solution: driver Gear x Driver RPM=Driven Gear x Driven RPM 38 x 360 = N x 144 13,680 = 144N 13,680 / 144 = 144N / 144 95 = N (95 Tooth Gear Which of the following is required for a sealed ball bearing? - Answer-It does not need to be lubricated under normal use. A DAFT is an acronym meaning: - Answer-Dissolved Air Flotation Thickener. What is the governing agency that permits odor control systems? - Answer-AQMD: Air Quality Management DistrictAt what pressure rating would you use a blower instead of a fan? - Answer-7 PSI Which of the following valves is unsuitable for high-pressure flow? - Answer-A needle valve A sodium hypochlorite tank's full working capacity is 23,000 gallons. Its current level is at 1,200 gallons. How many gallons does the delivery driver need to add to bring it to 70% capacity? - Answer-Solution: 23,000 gallons max capacity x 70% desired capacity = 16,100 gallons desired. 16,100 gallons desired - 1,200 gallons current level 14,900 gallons needed to add What is the result if 6/8 " is converted to decimal form? - Answer-6 / 8 = 0.75 or .75 What is the conversion of 212 degrees Fahrenheit into Celsius? What is the conversion of 100 degrees Celsius into Fahrenheit? - Answer-C° = (F° - 32)/9 x 5 •Begin by subtracting 32 from the Fahrenheit number. •Divide the answer by 9. •Then multiply that answer by 5. To convert from Celsius to Fahrenheit: F° = (C° x 9/5) +32•Begin by multiplying the Celsius temperature by 9. •Divide the answer by 5. •Now add 32. =212 degrees F