問題一覧
1
What type of bolt threaded on both ends and can be used where a through bolt impossible?
Stud bolt
2
In bolts design, the quotient of the proof load and the tensile-stress area is called
proof strength
3
Splines are used when:
Axial relative motion between shafts and hubs is necessary
4
Universal Coupling is:
Used for non-collinear shafts
5
A type of key in which width and thickness are equal is called as:
Square Key
6
These clutches produce positive coupling between the two shafts, regardless of direction of rotatiin
Jaw clutches
7
In bolts design, proof strength corresponds approximately how many percent of the 0.2 percent offset yield strength?
90%
8
The maximum efficiency of self-locking screw is
50%
9
The speed at which the center of mass will be equal the deflecting forces on the shaft; the shaft with its attached bodies will then vibrate violently since the centrifugal force changes its direction as the shaft turns in:
Critical Speed
10
What type of key that allows the hub to move along the shaft but prevents the rotation of the shaft?
Feather key
11
What type of bolt distinguished by a short portion of the shank underneath the head being square or finned or ribbed?
Carriage bolt
12
What type of key is used for mounting shifting gears in gear boxes?
Splines
13
It is the distance in inches a screw thread (a helix) advances axially in one turn.
Lead
14
The crest diameter of a screw thread is the same as:
Major Diameter
15
A tool bit for cutting an American National thread should be ground with an angle of:
60 deg
16
Which of the following cannot be a poisson’s ratio of material?
0.57
17
What is the maximum shaft angle for a single Hooke’s coupling?
15 deg
18
While designing a parallel sunk key it is assumed that the distribution of force along the length of the key
is uniform throughout
19
It is used for permanent fits and similar to involute splines except that the pressure angle is 14.5 deg
Involute Serrations
20
Which of the following screw thread is adopted for power transmission in either direction?
ACME thread