| 1. | Which among the following is not the purpose of grease ? | |
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carry away heat produced in bearing
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prevent metal-to-metal contact and reduce friction
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prevent entry of foreign material i.e. dust, dirt etc. In the bearing
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provide a cushion to load and shocks
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Report Question| 2. | Fire point is ? | |
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the temperature at which an oil gives off sufficient vapour to burn it continuously when ignited
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the temperature at which an oil will cease to flow when cooled
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the lowest temperature at which an oil gives off sufficient vapour to support a momentary flash without actually settings fire
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the temperature at which fire is produced
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| 3. | The most important quality of any lubricant is __________ ? | |
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viscosity
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specific gravity
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specific heat
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emulsification
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| 4. | The good example of splash lubrication system ? | |
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oil can
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resin
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ring lubricators
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rolling oil
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| 5. | Which cutting fluid is used for heavy duty machine with less cutting speed ? | |
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fatty oil
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synthetic oil
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soluble oil
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straight mineral oil
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| 6. | What is the colour of soluble oil mixed with water ? | |
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violet
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yellow
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white
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blue
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| 7. | What coolant is recommended for tapping copper or aluminium ? | |
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lard oil
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kerosene
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soluble oil
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dry air
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| 8. | Which one of the following is not a function of cutting fluid ? | |
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to cool the tool
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to flush away the chip
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to increase the friction between the chip and tool face
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to cool the work peace
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| 9. | A lubricant is necessary to ? | |
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run the machine smoothly taking least load
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run the machine quickly
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stop the machine immediately
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produce work peace of greater accuracy
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| 10. | Which one of the following is not the property of a good lubricant ? | |
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no change in viscosity due ti variation in temperature
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reduces friction between machine part
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takes up the surface pressure between sliding part
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becomes thicker after prolonged use.
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