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| Rankine cycle
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The thermodynamic cycle that is an ideal standard for comparing performance of heat-engines, steam power plants, steam turbines, and heat pump systems that use a condensable vapor as the working fluid; efficiency is measured as work done divided by sensible heat supplied. |
| Rapid curing cutback
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Quick-drying asphalt that is liquefied with gasoline to reduce evaporation time. |
| Rapid start circuit
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A fluorescent lamp-ballast circuit which utilizes continuos cathode heating, while the system is energized, to start and maintain lamp light output at efficient levels. Rapid start ballasts may be either electromagnetic, electronic or hybrid designs. Full-range fluorescent lamp dimming is only possible with rapid start systems. |
| Rapid-start fluorescent light
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A fluorescent light that comes on instantly like an incandescent light. The filaments in the tubes are kept hot to allow the light to come on without the slow flickering typical of fluorescent lighting. |
| Rasp
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A coarse file used for shaping materials. |
| Ratable
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An estimated insurance risk to calculate a reasonable premium that would provide sufficient resources, while still being affordable, in the event that the company is required to pay a claim. |
| Ratchet
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A mechanism that allows movement in one direction, but not another, as in a socket wrench. |
| Ratchet extension
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| Ratchet hoist
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A mechanism used for lifting. The device is pumped down to lift with a ratchet locking before the upstroke to prevent any slippage of object being lifted. |
| Ratchet screwdriver
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A screwdriver containing a ratchet to allow use without releasing the handle. |
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