In a chain drive the arc of roller chain engagement should not less than : 180 o
ID: 2087126 • Letter: I
Question
In a chain drive the arc of roller chain engagement should not less than :
180 o
160 o
140 o
120 o
Preferred range of center distance for roller chain drives should be between :
A)10 and 30 pitches
B)20 and 40 pitches
30 and 50 pitches
D) None of the above
Which one of the following statements is false for chain drives ?
No slippage between chain and sprocket teeth
Long operating life expectancy
Can not be operated at high temperatures, oily environments and high moisture
Negligible stretch
a180 o
b160 o
c140 o
d120 o
Explanation / Answer
1. the angle should not be less than 1200 .less than that slipping will take place on the smaller pulley.basically, the angle depends on many factors like the radius of both pulleys and distance between the pulleys.
2.for optimum wear life of roller chain drives the centre distance should be in between 30 to 50 times the pitches.
3.the answer is (c) because chain drives can be used at an adverse temperature and atmospheric conditions.