1. Classify the bearings.
Based on nature of contact between bearing
Sliding contact bearing.
Rolling contact (or) Antifriction bearing.
Based on load applied
Radial bearing (Circumferentially loaded)
Thrust bearing (Axially loaded)
the advantage of Teflon which is used for bearing?
It has lower co efficient of friction
It can be used at high temperature
It is practically chemically inert
It is dimensionally stable
the stresses induced in flywheel arms?
Tensile stress due to centrifugal force.
Bending stress due to Torque.
Stress due to belt tension.
Specify the types of flywheel.
Solid piece flywheel.
a. Web type b.
Rim and hub type.
and hub type only
type of lubricant used in journal bearing?
Mineral oil and synthetic oil
the function of a flywheel?
A flywheel is a machine member serves a reservoir
which stores energy during the period when the supply of energy is more than
the requirement and releases it during the period when the requirement of
energy is more than the supply.
6. Specify the types of lubricant with example.
lubricants - Mineral and synthetic oils.
lubricants - Grease ,
lubricants - Graphite
7. State the merits of hydrostatic bearing.
hydrostatic bearing steady loads without any relative motion between the
journal and the Bearing.
8. Define co-efficient of fluctuation of energy in
It is the
ratio of fluctuation of energy to the work done per cycle.
9. What are the bearing materials?
Alloy, Copper alloy, Babbit, Cast iron steel, Silver etc.
10.State the different failure theories and the type of materials for which these are applicable?
Maximum principal theory –brittle material.
Shear Stress Theory –Ductile Material.
known as self – acting bearing?
pressure is created within the system due to rotation of the shaft, this type
of bearing is known as self – acting bearing.
is a machine elements used to minimize the fluctuation of speed in an engine.
is the function of flywheel?
flywheel used in machine serves as a reservoir which stores energy during the
period when the supply of energy is more than the requirement and releases it
dulling the period when the requirement of energy is more than the supply.
the term ‘fluctuation of speed’ and ‘fluctuation of energy’.
of maximum fluctuation of speed to the mean speed is called co efficient of
fluctuation of speed. The ratio of fluctuation of energy to the mean energy is
called coefficient of fluctuation of energy.
the type of stresses induced in a rim flywheel?
Tensile stress due to centrifugal force
Tensile bending stress caused by the restraint of
the arms and
The shrinkage stresses due
to unequal rate of cooling of casting.