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Free download in PDF Lubricants Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
The best example for semi-liquid lubricant is
[A]
Lard oil
[B]
Graphite
[C]
Grease
[D]
Castor oil
(22)
Best example for gravity feed lubrication is
[A]
Tell-tale lubricator
[B]
Ring lubricator
[C]
Wick feed lubricator
[D]
Grease gun
Answer: Wick feed lubricator
(23)
Most common type of cutting fluid used in almost all the machining operation is
[A]
Soluble oil
[B]
Compressed air
[C]
Water
[D]
Lard oil
(24)
Graphite is a
[A]
Solid lubricant
[B]
Semi-liquid lubricant
[C]
Liquid lubricant
[D]
None of the above
(25)
The best example for splash lubrication is
[A]
Grease gun
[B]
Wick feed lubricator
[C]
Pump lubricator
[D]
Ring lubricator
(26)
Which one of the following is the reason that tap water is not preferred as coolant on machine tool ?
[A]
Danger of corrosion
[B]
It has insufficient cooling effect
[C]
Due to high cooling effect the cutting edges of the tool break off
[D]
None of the above
Answer: Danger of corrosion
(27)
Which one of the following frictions occurs in an un-lubricated journal bearing ?
[A]
Fluid friction
[B]
Sliding friction
[C]
Dry friction
[D]
Rolling friction
(28)
In which one of the following materials no cutting oil is used when drilling ?
[A]
Grey cast iron
[B]
Tool steel
[C]
Aluminium
[D]
Copper
(29)
Viscosity numbering system is used to rate the _____ of engine, oil.
[A]
Oil temperature
[B]
Oil weight
[C]
Thickness
[D]
Oil gravity
(30)
High engine oil consumption can not he caused by
[A]
Worn piston rings or cylinders
[B]
Leaking valve cover gaskets
[C]
Oil leakage into combustion chambers
[D]
Leaking exhaust manifold gaskets
Answer: Oil leakage into combustion chambers
31
For heavy cutting, the effective lubricants are _________
[A]
cutting oils
[B]
kerosene
[C]
coconut oils
[D]
diesel
32
The lubricants that are suitable for internal combustion engines must have ______ viscosity index.
[A]
minimum
[B]
low
[C]
high
[D]
None
33
Slideways of a machine are frequently lubricated by
[A]
Wick feed lubricator
[B]
Grease gun
[C]
Oilcan
[D]
Ring lubricator
34
The effective cutting of steel with hand hacksaw, which one of the following coolants is suitable ?
[A]
Kerosene oil
[B]
Grease
[C]
Lard oil
[D]
Cutting oil
35
Which among the following is NOT a purpose of greasing ?
[A]
Provide a cushion to a load and shocks
[B]
Prevent metal-to-metal contact and reduce friction
[C]
Prevent entry of foreign material i.e dust, dirt etc. in the bearing
[D]
Carry away the heat produced in bearing
Answer: Carry away the heat produced in bearing
36
The most important quality of any lubricant is
[A]
Specific heat
[B]
Specific gravity
[C]
Viscosity
[D]
Emulsification
37
Which one of the following is common method for applying cutting fluid on the tool point ?
[A]
With a brush
[B]
With an oilcan
[C]
With high pressure jet
[D]
Either 'B' or 'C'
Answer: With high pressure jet
38
While machining cast iron, the coolant used should be
[A]
Soft water
[B]
Machine oil
[C]
Kerosene
[D]
Dry air
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