LUBRICANTS AND COOLANTS MCQ 1
1) A lubricant is necessary to
run the machine smoothly taking least load
run the machine quickly
stop the machine immediately
produce workpiece of greater accuracy
2) The general ratio of soluble oil and water used as coolant is
10:1
1:10
1:20
20:1
3) The best example for semi-liquid lubricant is
grease
graphite
castor oil
lard oil
4) Best example for gravity feed lubrication is
grease gun
ring lubricator
tell-tail lubricator
wick feed lubricator
5) Most common type of cutting fluid used in almost all the machining operations is
water
lard oil
soluble oil
compressed air
6) Fire point is
the temperature at which an oil gives off sufficient vapour to burn it continuously when ignited
the temperature at which an oil will cease to flow when cooled
the lowest temperature at which an oil gives off sufficient vapour to support a momentary flash without actually setting fire
the temperature at which fire is produced
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
grease gun
pump lubricator
9) Slideways of a machine are frequently lubricated by
oilcan
grease gun
ring lubricator
wick feed lubricator
10) Which one of the following is the reason that tap water is not preferred as coolant on machine tools?
It decreases cutting action of the tool
Danger of corrosion
It has insufficient cooling effect
Due to high cooling effect the cutting edges of tool break off
11) Which one of the following frictions occurs in an un-lubricated journal bearing?
Sliding friction
Rolling friction
Fluid friction
Dry friction
12) In which one of the following materials no cutting oil is used when drilling?
Tool steel
Grey cast iron
Copper
Aluminium
13) The effective cutting of steel with hand hacksaw, which one of the following coolants is suitable?
Cutting oil
Grease
Lard oil
Kerosene oil
14) Which among the following is NOT the purpose of grease?
Carry away heat produced in bearing
Prevent metal-to-metal contact and reduce friction
Prevent entry of foreign material i.e. dust, dirt etc. in the bearing
Provide a cushion to load and shocks
15) Which one of the following is NOT the property of a good lubricant?
No change in viscosity due to variation in temperature.
Reduces friction between machine parts.
Takes up the surface pressure between sliding parts.
Becomes thicker after prolonged use.
16) The most important quality of any lubricant is
viscosity
specific gravity
specific heat
emulsification
17) Which one of the following is the best way for preparing an emulsion?
Mix soluble oil and water by pouring both simultaneously
Add water to the soluble oil
Add soluble oil to the water
None of the above
18) Which one of the following is common method for applying cutting fluid on the tool point?
With high pressure jet
With a brush
With an oil can
Either ‘b’ or ‘c’
19) While machining cast iron, the coolant used should be
dry air
kerosene
machine oil
soft water
1) Soluble oil is used as cutting fluid in ………………….
Sawing
Drilling and boring
Reaming
All of these
2) Usually no cutting oil is used in …………………..
Planing and shaping
Broaching
Honing
Thread rolling
3) The following device is used to determine the mix ratio of water-soluble coolants:
Diffract meter
Hydrometer
Refract meter
None of these
4) The use of metal working fluids ……………………..
Increases the tool life
Produces better surface finish
Prevents rise in temperature
All of these
5) The main constituent(s) of mineral oil is/ are ………………….
Paraffin
Naphthenic
Aromatics
All of these
6) Which of the following is added to the cutting fluids so that soapy film is produced between the work piece & tool and chip & tool face?
a) Sulphur
b) Chlorine
c) Both (a) and (b)
d) None of these
7) Viscosity is an internal property of a fluid, it is a measure of its resistance to …………….
Current
Flow
Light
Sound
8) A high viscosity index indicates relatively …………………. changes in viscosity of the oil with the temperature.
a) Larger
b) Smaller
c) Constant
d) None of these
9) ………………… is the property of lubricating oil due to which the oil particles stick with the metal surfaces.
a) Oiliness
b) Pour point
c) Adhesiveness
d) None of these
10) ……………….. is the property of a lubricating oil due to which the oil retains a thin film between the two surfaces.
a) Oiliness
b) Film Strength
c) Adhesiveness
d) None of these
11) Lubricating oil
a) Minimizes wear in moving parts
b) Helps in keeping the parts cool
c) Washes away and carries away dirt
d) All of these
12) In the following system, lubricating oil is carried in separate tanks from where it is fed to the engine
Dry sump system
Mist lubrication system
Splash system
Wet sump system
13) ………………… is the ability of the oil to resist internal deformation due to mechanical stresses.
a) Viscosity
b) Flash point
c) Fire point
d) None of these
14) Temperature at which the lubricant catches fire
Flash point
Fire point
Pour point
Viscosity
15) Temperature at which the vapours is given of from the oil ?
Flash point
Fire point
Oiliness
Pour point
16) Which one of the following is liquid lubricant?
Wax
Grease
Molybdenum disuiphide
Synthetic oil
18) Solid lubricant is ……………………..
Caster Oil
Lord Oil
Graphite
Grease
19) Cutting compound used during machining operation is …………..
Tarpin Oil
Grease
Water
Soluble Oil
20) Splash lubrication is done by …………….
Grease Gun
Ring Lubricator
Oil can
Pump Lubricator
