σ [1 + (b/2a)]
σ [1 + (2a/b)]
σ [1 + (b/3a)]
σ [1 + (3a/b)]
B. σ [1 + (2a/b)]
Open belt drive transmits more power than crossed belt drive
Crossed belt drive transmits more power than open belt drive
Open and crossed belt drives transmit same power
Power transmission does not depend upon open and crossed types of constructions
0.70
0.25
0.40
0.55
0.2
0.25
0.50
0.6
T sec3φ
T sec²φ
T/sec3φ
T cosecφ
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
V-belt drive
Rope drive
Crossed flat belt drive
Chain drive
Knuckle threads
Square threads
Acme threads
Buttress threads
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 required to be applied after some intervals
Decreasing the cross-section area of bar
Increasing the cross-section area of bar
Remain unaffected with cross-section area
Would depend upon other factors
Increasing the initial tension in the belt
Dressing the belt to increase the coefficient of friction
Increasing wrap angle by using idler pulley
All of the above methods
X-axis as neutral axis
Y-axis as neutral axis
X-axis or Y-axis as neutral axis
Z-axis
Shear strength is equal to crushing strength
Shear strength is greater than crushing strength
Shear strength is less than crushing strength
None of the above
More
Less
Same
More or less depending on quantum of load
Bottom side only
Top side only
On both sides
Any side
Reducing
Increasing
Both A and B
None of these
Shaft B is better than shaft A
Shaft A is better than shaft B
Both the shafts are equally good
None 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
Metric
Buttress
Square
NPT (national pipe threads)
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
Flat belt drive
V-belt drive
Crossed belt drive
Timing belt
1420 d
1680 d
2080 d
2840 d
124 d
138 d
151 d
168 d
1 : 1
2 : 1
3 : 2
2 : 3
Which are not in exact alignment
Which are perfectly aligned
Whose axes intersect at a small angle
Have lateral misalignment
Brittle materials
Ductile materials
Elastic materials
Plastic materials
Right hand threads on bout ends
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
Normal pitch
Axial pitch
Diametral pitch
Module
Lower critical temperature
Upper critical temperature
Recrystallisation temperature
None of these
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for both the straps on the inside and outside
0.625 t for both the straps on the inside and outside
Low efficiency
High efficiency
High load lifting capacity
High mechanical advantage