Provide cushioning effect
Provide bearing area
Absorb shocks and vibrations
Provide smooth surface in place of rough surface
B. Provide bearing area
Low efficiency
High efficiency
High load lifting capacity
High mechanical advantage
Static load
Dynamic load
Impact load
Completely reversed load
Leather
Rubber
Canvas or cotton duck
Balata gum
Eutectoid steel
Hypereutectoid steel
Hypo-eutectoid steel
None of these
Spindles of bench vices
Railway carriage couplings
Feed mechanism of machine tools
Screw cutting lathes
Effective length of column to least radius of gyration of the column
Width of column to depth of column
Maximum size of column to minimum size of column
Effective length of column to width of column
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
Material of belt and pulley
Slip of belt
Speed of belt
All of these
Square threads
Multiple threads
Acme threads
Buttress threads
10 m/s
12.5 m/s
15 m/s
20 m/s
Longitudinal stress
Hoop stress
Longitudinal and hoop stress
None of these
1 in 16
1 in 32
1 in 48
1 in 100
4
6
8
10
Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied
Abrupt change of section
All of the above
Pt /P
Ps /P
Pc /P
Least of Pt, Ps and Pc/P
Crown bevel gears
Angular bevel gears
Mitre gears
Internal bevel gears
10
15
20
25
Friction angle is less than helix angle
Friction angle is more than helix angle
Friction angle is equal to helix angle
Efficiency of screw is 100%
Measure forces
Apply forces
Store energy
All of these
One-eighth
One-fourth
One-half
Double
Parallel
Perpendicular
Both A and B
None of these
(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)
(Kt + 1)/ (Kf + 1)
(Kt - 1)/ (Kf - 1)
Tempering
Normalising
Annealing
Spheroidising
Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force
Resists fracture due to high impact loads
Retain deformation produced under load permanently
The V-belt may be operated in either direction with tight side of the belt at the top or bottom
The V-belt drive is used with large centre distance
The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts
The ratio of driving tensions in V-belt drive is more than flat belt drives
Low carbon steel
High carbon steel
Medium carbon steel
High speed steel
Material of the belt
Material of the pulley
Uneven extensions and contractions due to varying tension
All of the above
7.5 kN
10.6 kN
15 kN
22.5 kN
90
60
120
100
0.75/ (0.75 + √v)
3/ (3 + v)
4.5/ (4.5 + v)
6/ (6 + v)