Reduce vibration
Reduce slip
Ensure uniform loading
Ensure proper alignment
C. Ensure uniform loading
1420 d
1680 d
2080 d
2840 d
K
K/2
2K
K/4
Brinell
Rockwell
Vickers
None of the above
Elastic limit to the working stress
Elastic limit to the yield point
Endurance limit to the working stress
Young's modulus to the ultimate tensile strength
At bottom
At sides only
Both at bottom and sides
Could touch anywhere
90° - φ
45° - φ
45° - φ/2
45° + φ/2
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy
Concerned with strength of wire of spring
Direction of twist of wires in strands is opposite to the direction of twist of strands
Direction of twist of wires and strands are same
Wires in two adjacent strands are twisted in opposite direction
Wires are not twisted
Single
Double
Triple share
None of these
Spigot and socket cotter joint
Sleeve and cotter joint
Gib and cotter joint
Any one of these
There is a thick film of lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is no lubricant between the journal and the bearing
0.5 times
Equal to
2 times
Double
Material of belt and pulley
Slip of belt
Speed of belt
All of these
Is just sufficient to hold parts together
Approaches yield point
Is 50% of yield point
Is about yield point divided by safety factor
p = D sin (90°/T)
p = D sin (120°/T)
p = D sin (180°/T)
p = D sin (360°/T)
Same in both cases
2 times more
3 times more
4 times more
Bottom side only
Top side only
On both sides
Any side
Dependent on number of teeth of a gear
Dependent on system of teeth
Independent of size of teeth
All of these
Euler's formula
Rankine's formula
Johnson's straight line formula
Johnson's parabolic formula
Tolerance grade for the hole is 6 and for the shaft is 5
Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
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
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
Tensile strength
Compressive strength
Shear strength
Bending strength
Heavy load
Loose belt
Driving pulley too small
All of the above
10
15
20
25
7.5 kN
10.6 kN
15 kN
22.5 kN
Medium series whose bore is 5 mm
Medium series whose bore is 25 mm
Light series whose bore is 25 mm
Light series whose bore is 5 mm
2.5
2.8
3.0
3.5
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Normal pitch
Axial pitch
Diametral pitch
Module