More than 50 %
Less than 50 %
Equal to 50 %
None of these
A. More than 50 %
Crown bevel gears
Angular bevel gears
Mitre gears
Internal bevel gears
Woodruff key
Feather key
Flat saddle key
Gib head key
They are cheap
They can work at high temperature
They are unaffected by moisture and humidity
None of the above
A key is used as a temporary fastening
A key is subjected to tensile stresses
A key is always inserted parallel to the axis of the shaft
A key prevents relative motion between the shaft and boss of the pulley
Tension
Shear
Compression
All of the above
4F/ πd²
6F/ πd²
8F/ πd²
16F/ 3πd²
Partially
Fully
Either A or B
None of these
W/2
2W/3
W/9
8W/9
Cold working
Shot peening
Surface decarburisation
Under stressing
Tensile strength
Compressive strength
Shear strength
Bending strength
Be independent of ratio of mass of load W to mass of bar (y)
Increase with increase in y
Decrease with decrease in y
Depend on other considerations
40
50
70
100
0.2
0.25
0.50
0.6
10 to 20 %
20 to 30 %
30 to 40 %
40 to 50 %
Has a head on one end and a nut fitted to the other
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Is provided with pointed threads
Addendum circle
Dedendum circle
Pitch circle
Clearance circle
Heavy thrust load only
Small angular displacement of shafts
Radial load at high speed
Combined thrust and radial loads at high speed
Static load
Dynamic load
Impact load
Completely reversed load
To produce torque
For speed reduction
To obtain variable speeds
To increase efficiency of system
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 two parts
Similar to stud
0.1 and 0.25
0.25 and 0.50
0.50 and 0.75
0.75 and 1
124 d
138 d
151 d
168 d
Reduce vibration
Reduce slip
Ensure uniform loading
Ensure proper alignment
Increases the seriousness of static loading stress concentration
Lessens the seriousness of static loading stress concentration
Has no effect on it
Depends on other considerations
Effective
Smallest
Largest
None of these
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
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
ISO metric thread
Acme thread
Square thread
Buttress thread
10°-20°
30°-40°
40°-60°
60°-80°
Tensile stress
Compressive stress
Direct shear stress
Torsional shear stress