1) The general ratio of soluble oil and water used as a coolant is
1:20
10:1
20:1
1:10
2) The lubricant is necessary to
Produce workpiece of greater accuracy.
Stop the machine immediately.
Run the machine quickly.
Run the machine smoothly taking the least load.
3) The best example of gravity feed lubrication is
Ring lubricator
Wick feed lubricator
Tell-tale lubricator
Grease gun
4) The best example for semi-liquid lubricant is
Graphite
Grease
Lard oil
Castor oil
5) Fire point is ......................
The lowest temperature at which an oil gives off sufficient vapor to support a momentary flash without actually setting the fire.
The temperature at which an oil will cease to flow when cooled.
The temperature at which the fire is produced.
The temperature at which an oil gives off sufficient vapor to burn it continuously when ignited.
6) The most common type of cutting fluid used in almost all the machining operation is
Compressed air
Soluble oil
Water
Lard oil
7) Graphite is a
Liquid lubricant
Semi-liquid lubricant
Solid lubricant
None of the above
8) The best example for splash lubrication is
Ring lubricator
Wick feed lubricator
Pump lubricator
Grease gun
9) Slideways of a machine is frequently lubricated by
Oil can
Wick feed lubricator
Ring lubricator
Grease gun
10) Which one of the following is the reason that tap water is not preferred as a coolant on machine tools?
It has an insufficient cooling effect.
It decreases cutting action of the tool.
Due to the high cooling effect, the cutting edges of tool break off.
The danger of corrosion.
11) Which one of the following frictions occurs in an un-lubricated journal bearing?
Sliding Friction
Dry Friction
Fluid Friction
Rolling friction
12) In which one of the following materials no cutting oil is used when drilling?
Grey cast iron
Tool steel
Copper
Aluminum
13) Preventive maintenance is
The overall lubrication and repair work carried out by the maintenance section in advance of the machine coming to breakdown.
The maintenance work for any fault noticed during the work.
Done to prevent the maintenance of machines.
None of the above.
14) For effective cutting of steel with hand hacksaw, which one of the following coolants is suitable?
Lard oil
Kerosene oil
Grease
Cutting oil
15) Leveling bolts are used for
Supporting the load for machine
Adjusting the height of the machine
Rigidity of machine
None of the above
16) Which one of the following tests are carried out after overhauling and reconditioning of machines?
Periodic acceptance test
Geometrical test only
Performance test only
None of the above
17) The permissible deviation for leveling of the machine is
0.03 / 100 mm
0.03 / 200 mm
0.03 / 300 mm
0.03 / 400 mm
18) Which one of the following is used for checking run out of the internal taper of machine spindle?
Precision height gauge
Test mandrel and dial test indicator
Test mandrel and precision height gauge
Dial test indicator
19) The sensitivity of precision spirit level is
0.02 to 0.05 / 100 mm
0.02 to 0.05 / 200 mm
0.02 to 0.05 / 500 mm
0.02 to 0.05 / 1000 mm
20) Which among the following is NOT the purpose of a grease?
Prevent metal-to-metal contact and reduce friction.
Provide a cushion to a load and shocks.
Carry away heat produced ¡n bearing.
Prevent entry of foreign material i.e. dust, dirt etc. in the bearing.
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