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List different types of ‘kinematic pair’.

Types of Kinematic pairs:
[1] According to the type of relative motion between the elements:
(a) Sliding pair.
(b) Turning pair.
(c) Rolling pair.
(d) Screw pair.
(e) Spherical pair.

[2] According to the type of contact between the elements:
(a) Lower pair.
(b) Higher pair.
[3] According to the type of closure:
(a) Self closed pair.
(b) Force - closed pair.
[4] According to Constrained Motion:
(a) Incompletely Constrained
(b) Completely Constrained
(c) Successfully Constrained

Define term ‘kinetics’

Definition of Kinetics:
It is that branch of Theory of Machines which deals with the inertia forces which arise from
the combined effect of the mass and motion of the machine parts.

fsd

stress is load per unit area.

Define following terms of spring:

(i) Spring rate: The spring rate is defined as the load required per unit deflection of the spring. It is also
known as spring stiffness or spring constant. Mathematically,
Spring rate, k = W / δ
Where,
W = Load
δ = Deflection of the spring
(ii) Spring index: The spring index is defined as the ratio of the mean diameter of the coil to the
diameter of the wire. Mathematically,
Spring index, C = D / d
Where,
D = Mean diameter of the coil
d = Diameter of the wire

What are the requirement of a good coupling?

A good coupling should have the following requirements: (i) It should be easy to connect and disconnect. (ii) It should transmit the full power from one shaft to another shaft without losses. (iii) It should hold the shafts in perfect alignment. (iv) It should reduce the transmission of shock loads from one shaft to another shaft. (v) It should have no projecting parts

State four types of keys.

(i) Sunk key: Rectangular sunk key, Square sunk key and Parallel sunk key (ii) Gib-head key (iii) Feather key Any four (iv) Woodruff key types of keys (v) Saddle key: Flat saddle key, Hollow saddle key (vi) Tangent key (vii) Round key

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