Free from corrosion
Stronger in tension
Free from stress
Leak-proof
D. Leak-proof
ZN/p
p/ZN
Z/pN
N/Zp
120°
180°
270°
360°
The efficiency of a self locking screw can not be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(A) and (B) Only
0.70
0.25
0.40
0.55
Joining thick cylinders
Calculating stresses in thick cylinders
Pre-stressing thick cylinders
Increasing the life of thick cylinders
10
15
20
25
Brittle materials
Ductile materials
Plastic materials
Nonferrous materials
(π/4) d² × τ × n
1.875 × (π/4) d² × τ × n
2 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n
Minor diameter
Major diameter
Pitch diameter
None of these
Same in both cases
2 times more
3 times more
4 times more
Provide cushioning effect
Provide bearing area
Absorb shocks and vibrations
Provide smooth surface in place of rough surface
Brittle when cold
Brittle when hot
Brittle under all conditions
Ductile at high temperature
0.5 times
Equal to
2 times
Double
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
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Which are perfectly aligned
Which are not in exact alignment
Which have lateral misalignment
Whose axes intersect at a small angle
Equating tearing resistance of the plate to the shearing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating shearing resistance to the crushing resistance of the rivets
None of the above
Directly as load
Inversely as square of load
Inversely as cube of load
Inversely as fourth power of load
Spur gearing
Helical gearing
Bevel gearing
Spiral gearing
Above
Below
At
None of these
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
Fine threads
Course threads
Coefficient of friction is greater than tangent of load angle
Hole for inserting split pin
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy
Its ability to absorb shocks
4
6
8
10
Thick film
Thin film
Either A or B
None of these
Shoe brake
Band and block brake
Band brake
Internal expanding brake
Pt /P
Ps /P
Pc /P
Least of Pt, Ps and Pc/P
Reducing stress concentration
Ease of manufacture
Safety
Fullering and caulking
0.124 - (0.684/T)
0.154 - (0.912/T)
0.175 - (0.841/T)
None of these
Normal pitch
Axial pitch
Diametral pitch
Module