Reducing
Increasing
Both A and B
None of these
A. Reducing
Brinell
Rockwell
Vickers
None of the above
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
2000-3000 kg/m²
3000-4000 kg/cm²
4000-4500 kg/cm²
7500-10,000 kg/cm²
T₁ - T₂ + Tc
T₁ + T₂ + Tc
(T₁ - T₂ + Tc)/2
(T₁ + T₂ + Tc)/2
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
To reduce friction
To facilitate slipping of balls
To prevent the lubricant from flowing out
To maintain the balls at a fixed distance apart
1 kN-m
2 kN-m
3 kN-m
4 kN-m
(Sum of base circle radii)/cosφ
(Difference of base circle radii)/cosφ
(Sum of pitch circle radii)/cosφ
(Difference of pitch circle radii)/cosφ
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
First type
Second type
Third type
Any one of these
(6V/ π)1/2
(6V/ π)1/3
(6V/ π)2
(6V/ π)3
45 to 60 %
63 to 70 %
70 to 83 %
80 to 90 %
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
Gerber relation
Soderberg relation
Goodman relation
None of these
Increases
Decreases
Remains unchanged
None of these
Long column
Short column
Strut
All of these
Above
Below
At
None of these
Axial load only
Both radial and axial loads and the ratio of these being greater than unity
Radial load only
Both radial and axial loads and the ratio of these being less than unity
Hollow saddle key
Hollow key
Soft key
None of these
Increasing its shank diameter
Increasing its length
Decreasing its shank diameter
Decreasing its length
Ductile materials
Brittle materials
Elastic materials
All of the above
20 to 30%
10 to 20%
30 to 40%
40 to 50%
0.5 mm upto rivet diameter of 24 mm
1 mm for rivet diameter from 27 mm to 36 mm
2 mm for rivet diameter from 39 mm to 48 mm
All of the above
Bending moment only
Twisting moment only
Combined bending moment and twisting moments
Combined action of bending moment, twisting moment and axial thrust
Over head shaft
Counter shaft
Line shaft
All of these
Thick lubricated bearings
Plastic bearings
Antifriction bearings
Thin lubricated bearings
Increase shank diameter
Increase its length
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Tighten die bolt properly
Whose upper deviation is zero
Whose lower deviation is zero
Whose lower as well as upper deviations are zero
Does not exist
Both ends hinged
Both ends fixed
One end fixed and the other end hinged
One end fixed and the other end free
Angular bevel gears
Mitre gears
Crown Bevel gears
Internal bevel gears