Spigot and socket cotter joint
Sleeve and cotter joint
Gib and cotter joint
Any one of these
C. Gib and cotter joint
Pitch diameter
Inside diameter
Outside diameter
Height
Joining thick cylinders
Calculating stresses in thick cylinders
Pre-stressing thick cylinders
Increasing the life of thick cylinders
Bending stress only
A combination of torsional shear stress and bending
Direct shear stress only
A combination of bending stress and direct shear stress
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The product of the endurance limits with and without stress concentration
All of the above
Both ends hinged
Both ends fixed
One end fixed and the other end hinged
One end fixed and the other end free
Bottom of groove of the pulley
Sides and bottom of groove of the pulley
Anywhere in the groove of the pulley
Sides of groove of the pulley
0.124 - (0.684/T)
0.154 - (0.912/T)
0.175 - (0.841/T)
None of these
Are lighter in weight
Offer silent operation
Can withstand shock loads
All of these
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the applied torque and the polar moment of inertia
Inversely proportional to the applied torque and the polar moment of inertia
√(Pmax / 2m)
√(Pmax / 3m)
√(Pmax / m)
√(3m /Pmax) Where m = mass of belt per metre (kg/m) Pmax = maximum permissible tension in belt (N)
8
6
4
2
Nil or lightest
Maximum
Average
Any one of the above
(WD/ πd3) × K
(2WD/ πd3) × K
(4WD/ πd3) × K
(8WD/ πd3) × K
The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets
The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole
The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm
According to I.B.R., the thickness of butt strap shall not be less than 5 mm
Electroplating
Polishing
Coating
Shot peening
Be across threaded portion of shank
Be parallel to axis of bolt
Be normal to threaded portion of shank
Never be across the threaded portion
Normal pitch
Axial pitch
Diametral pitch
Module
Only the broken belt is replaced
The entire set of belts is replaced
The broken belt and the belt on either side of it, is replaced
The broken belt need not to be replaced
Guest's theory
Rankine's theory
St Venant's theory
Von Mises theory
(6V/ π)1/2
(6V/ π)1/3
(6V/ π)2
(6V/ π)3
Axial load only
Both radial and axial loads and the ratio of these being greater than unity
Radial load only
Both radial and axial loads and the ratio of these being less than unity
Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors
2000 N-m
2050 N-m
2100 N-m
2136 N-m
Surface of the top of the tooth
Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
p.d.σt
p.t.σt
(p - d) σt
(p - d) t.σt
The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials
The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials
The toughness of a material increases when it is heated
The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres
Equal to
sinα times more than
sinα times less than
cosecα times more than
Rectangular
Elliptical
I-section
Any one of these
Brittle when cold
Brittle when hot
Brittle under all conditions
Ductile at high temperature
½
1
2
4