What causes the ridge at the top of a cylinder?
What will be an ideal response?
The ridge is caused by the pressure of combustion forcing the ring against the cylinder wall. It is also caused by the lack of lubrication at the top of the cylinder.
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The type of form system that can be as wide as 50 feet are _____.
a. slip forms b. job-built wall forms c. gang forms d. insulating concrete forms
Technician A says that a rotary screw compressor has a 100 percent duty cycle. Technician B says that a rotary screw compressor can produce air at about one-half the temperature of piston-compressed air. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B
When working with refrigerant cylinders which of the following should not be done?
A. Keep the outlet port of the refrigerant cylinder capped and the valve hood secured. B. Open cylinder valves slowly, and close after every use. C. Always store refrigerant cylinders in a horizontal position. D. Never add a source of external heat to a refrigerant cylinder.
Room temperature vulcanizing chemical sealants _____.
A. come only in one color B. typically cures in 48 hours C. will bond to the gasket D. cures when exposed to air