問題一覧
1
Which of the following statement(s) is correct for an oilness bearing?
Do not need external supply of lubricant
2
It is the ability to deform plastically to compensate for irregularities in bearing assembly. How do you call this?
Conformability
3
It is a bearing that permits constrained relative motion of rigid parts; lubricant is generally inserted or supplied between the mating surfaces to reduce friction and wear, and to carry away the heat generated.
Sliding contact bearing
4
In practice and theory as well, what is tge allowed permissible misalignment in cylindrical and tapered roller bearings?
0.001 rad
5
In practice and theory as well, the misalignment of spherical bearings should not exceed how many radians?
0.0087 rad
6
To avoid scoring in the bearing surface and the shaft due to contamination or absorption of the fine dirt in the bearing during operation/lubrication the bearing material to apply should have good ___ properties.
Embeddability
7
A general rule of thumb for cast-iron rim flywheels of average size is that the mean velocity should not exceed:
6000 fpm
8
In which one of the following is a flywheel generally employed?
Punching machine
9
The rim of a flywheel is subjected to
direct tensile stress and bending stress
10
Spring back metal forming depends on ____.
modulus of elasticity
11
What is the best method for increasing a spring’s fatigue life?
Shot peening
12
These springs are made from one or more flat strips of brass, bronze, steel or other materials loaded as cantilevers or simple beam.
Leaf springs
13
The maximum shear stress occurs on the outermost fiber of a circular shaft under torsion. In a close-coiled helical spring the maximum shear stress occurs on the
innermost fiber
14
The compliance of the spring is the:
Reciprocal of the spring constant
15
These are two basic types of torsion spring, one of which is the flat coil spring also known as power spring or
Clock spring
16
What is a hr recommendation speed for leather belt?
7000 to 8000 rpm
17
What is the recommended speed for fabric belts?
4000 to 5000 fpm
18
What is usually the lose factor for most wire ropes and chains with 180 degrees contact at low speeds?
varies from 1.03 to 1.06
19
Based on experience, what is the most economical design belt speed?
6000 to 7500 fpm
20
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, the energy stored in the latter at the same speed will be
one-fourth of the first one