221.
Stainless steel is so called because of its................
A
High strength
B
High corrosion resistance
C
High ductility
D
Brittleness
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Stainless steel is so called because of its................
High strength
High corrosion resistance
High ductility
Brittleness
% C in medium carbon steels ranges from ...............
0.3 - 0.4
0.3 - 0.5
0.3 - 0.6
None
What type of oil is suitable for thick film lubrication?
Hydrocarbon oil
Mineral oil
Polymeric oil
None of above
What type of lubrication is used in delicate machines like watches, sewing machines, etc?
Fluid film lubrication
Extreme lubrication
Boundary lubrication
Thin film lubrication
Special additives added to mineral oils are known as
Extreme pressure additives
Special additives
Mineral additives
Lubricating additives
Minimum separating distance in hydrodynamic lubrication is
100 A0
1000 A0
10000 A0
10 A0
Length of hydrocarbon chain in petroleum oils varies between about
0 to 12 Carbon atoms
0 to 50 Carbon atoms
21 to 30 Carbon atoms
12 to 50 Carbon atoms
Important extreme pressure additives contains functional group from following
Chlorides
Sulphides
Phosphides
All of above
Identify the odd type of lubricant from following
Semi solid
Liquid
Gaseous
Solid
Identify liquid lubricant from the following
Graphite
Lubricating oil
Mo Disulphide
Soapstone
Graphite is .............. lubricant.
Solid
Liquid
Semi solid
None of above
Ethanol is used as
Polymeric thickener
Polymer
Polymeric thinner
None of above
Coefficient of friction in fluid film or hydrodynamic lubrication is
0.1 to 0.3
0.01 to 0.03
0.001 to 0.03
None of above
Coefficient of friction for boundary lubrication is
0.5 to 15
0.005 to 0.05
0.5 to 0.15
0.05 to 0.15
Calcium soap base grease is also called as
Soap grease
Greases
Axle grease
Cup grease
Antiwear additive in extreme pressure additive is
Soapstone
Tricresyl phosphate
Mica
Graphite
Animal and vegetable oils possess
Good oiliness
Poor oiliness
Optimum oiliness
None of above
Animal and vegetable oils are also used as
Oiliness carrier
Blending agent
Solvent agent
Extreme pressure additives
Viscosity index can be defined as
(L-U / L-H) X 100
(L+U / L-H) X 100
(L-H / L-U) X 100
(L-H / L+U) X 100
Which would be a property of all the major types of lipids in this membrane?
They would be joined to each other through covalent bonds.
They would be saponifiable in base and hydrolyzed in acid.
They would have polar heads and non-polar tails.
They would be composed of five-carbon units.