問題一覧
1
Herring bone gears are gears which:
Have a line contact between the teeth
2
In usual spur gearing, which of the following statement(s) is correct?
Toothe outline are usually involute curves
3
A gear is one in which angle is 90 degrees that is the pitch cone has become plane
Crown gear
4
Which type of gears are used for shaft axes having an offset?
Hypoid gear
5
One of the causes of spurr gear tooth breakage is the unblanaced load on one end of the tooth that results in higher stresses than when the load is evenly distributed. To minimize this problem, the face width “b” should not be greater than the thickness (or pitch) of the tooth. In absence of the test values, the following can be a guide:
2.5 Pc < b < 4 Pc
6
What type of gear can transmit power at a certain angle?
Bevel Gear
7
It is used to change rotary motion to reciprocating motion.
Rack gear
8
In gear design, the ratio of the pitch diameter in inches to the number of teeth.
English module
9
Gear used to transmit power at high velocity ratios between non intersecting shafts that are usually but not necessarily at right angle.
Worm gear
10
For evenly distributed and uniform wear on each meshing gear tooth, the ideal design practice is to consider a:
Hunting tooth addition
11
It refers to the surface of the gear between the fillets of adjacent teeth.
Bottom land
12
If a set of spur gears are made installed and lubricated properly, they normally may be subjected to failures like:
Pitting
13
In designing gears for power transmission, consider an efficiency of ____ as recommended.
98% or more
14
The design of gear on account of spott’s equation which account for dynamic load is based on
contact stress based on Hertz theory
15
For a proper design and longer gear life
wear load must be more than dynamic load
16
The train value of gear train is ____.
reciprocal of the speed ratio
17
The gear train usually employed in clocks is a
reverted gear train
18
A reverted gear train is one in which the output shaft and input shaft
are coaxial
19
In a simple gear train, if the number of idler gears is odd, then the direction of motion of driven gear will
be same as that of the driving gear
20
In case of spur gears the flank of the tooth is
the part of the tooth surface lying below the pitch surface