Effect of temperature on belt
Material of belt
Unequal extensions in the belt due to tight and slack side tensions
Stresses beyond elastic limit of belt material
C. Unequal extensions in the belt due to tight and slack side tensions
Zero film bearing
Boundary lubricated bearing
Hydrodynamic lubricated bearing
Hydrostatic lubricated bearing
A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Both will be equally rigid
Which one is rigid will depend on several other factors
Bottom side of belt as slack side
Top side of belt as slack side
Idler pulley
None of the above
Length of arc of recess to the circular pitch
Length of path of contact to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of approach to the circular pitch
45°
60°
75°
90°
1 in 5
1 in 10
1 in 24
1 in 40
Metric
Buttress
Acme
Square
Muff coupling
Compression coupling
Flange coupling
All of these
Bending stress only
A combination of torsional shear stress and bending
Direct shear stress only
A combination of bending stress and direct shear stress
Increases linearly
Decreases linearly
Remains same
Increases exponentially
p.d.σt
p.t.σt
(p - d) σt
(p - d) t.σt
d
1.5 d
2.5 d
2 d
Shoe brake
Band and block brake
Band brake
Internal expanding brake
Right hand
Left hand
Both A and B
None of these
Ductile material
Brittle material
Elastic material
Hard material
Handle of a hand pump
Hand wheel of a punching press
Lever of a loaded safety valve
A pair of tongs
Diameter of bolt
0.75 × diameter of bolt
1.25 × diameter of bolt
1.5 × diameter of bolt
Which are perfectly aligned
Which are not in exact alignment
Which have lateral misalignment
Whose axes intersect at a small angle
1-3 m/s
3-15 m/s
15-30 m/s
30-50 m/s
Brittle when cold
Brittle when hot
Brittle under all conditions
Ductile at high temperature
The oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
Grease is used for lubrication
Prevent the rotation of load being lifted
Enhance the load carrying capacity of the jack
Reduce the effort needed for lifting the working load
Reduce the value of frictional torque
18% nickel and 8% chromium
18% chromium and 8% nickel
18% nickel and 8% vanadium
18% vanadium and 8% nickel
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts
Provided with detachable caps
Bending stress
Shear stress
Tensile stress
Bearing stress
Increasing velocity ratio
For applying tension
Changing the direction of motion of belt
All of these
Outer diameter
Hole diameter
Thickness
Mean diameter
One-eighth
One-fourth
One-half
Double
Elastic strength
Yield strength
Shear strength
None of these
Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors