Lubricants Objective Type Questions and Answers

Questions

21 The best example for semi-liquid lubricant is

A Lard oil

B Graphite

C Grease

D Castor oil

View Answer

Answer: Grease

22 Best example for gravity feed lubrication is

A Tell-tale lubricator

B Ring lubricator

C Wick feed lubricator

D Grease gun

View Answer

Answer: Wick feed lubricator

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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

View Answer

Answer: Soluble oil

24 Graphite is a

A Solid lubricant

B Semi-liquid lubricant

C Liquid lubricant

D None of the above

View Answer

Answer: Solid lubricant

25 The best example for splash lubrication is

A Grease gun

B Wick feed lubricator

C Pump lubricator

D Ring lubricator

View Answer

Answer: 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

View Answer

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

View Answer

Answer: Dry 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

View Answer

Answer: Grey cast iron

29 Viscosity numbering system is used to rate the _____ of engine, oil.

A Oil temperature

B Oil weight

C Thickness

D Oil gravity

View Answer

Answer: Thickness

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

View Answer

Answer: Oil leakage into combustion chambers

31 For heavy cutting, the effective lubricants are _________

A cutting oils

B kerosene

C coconut oils

D diesel

View Answer

Answer: cutting oils

32 The lubricants that are suitable for internal combustion engines must have ______ viscosity index.

A minimum

B low

C high

D None

View Answer

Answer: high

33 Slideways of a machine are frequently lubricated by

A Wick feed lubricator

B Grease gun

C Oilcan

D Ring lubricator

View Answer

Answer: Oilcan

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

View Answer

Answer: 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

View Answer

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

View Answer

Answer: Viscosity

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'

View Answer

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

View Answer

Answer: Dry air

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