Question
State the similarities and differences between a fixture and a jig?
Answers
: Both jig and fixture positively locate, hold and clamp the workpiece. Jigs guide the tool for drilling etc but fixture has no facility to guide the cutting tools. Jigs are used for drilling etc and fixture for mass milling, turning, grinding, etc.

71.Explain the difference between relative density, viscosity and kinematic viscosity ?
: Relative density is that pure number which denotes the ratio of the mass of a body to the mass of an equal volume of a substance taken as a standard. This standard is usually water (at 4°C) for solids and liquids, and air free or C02 or hydrogen (at 0°C and 1 atmosphere = 1.013 x 105 Pa pressure) for gases.
Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force. It is due primarily to interaction between fluid molecules.
Kinematic viscosity is the ratio of absolute viscosity and mass density. (Its unit is m2/s).   Your Comment




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