# Machine Design Questions and Answers – Design of Chain Drive

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This set of Machine Design aptitude tests focuses on “Design of Chain Drive”.

1. A gear meshes with another gear and a sprocket meshes with another sprocket.
a) True
b) False

Explanation: A sprocket meshes with with an intermediate link which further meshes with another sprocket.

2. The number of links of the chain should be always ______
a) Odd
b) Even
c) Multiple of 3
d) None of the listed

Explanation: The odd number of teeth are meshed with even number of links.

3. In chain drives, vertical drives are generally avoided.
a) True
b) False

Explanation: Sag causes the chain to leave the profile of the teeth at lower side.
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4. Sum of number of links and number of teeth of the sprocket is _____
a) Odd
b) Even
c) Odd or Even
d) None of the listed

Explanation: Number of links are even while number of teeth on the sprocket are odd.

5. The driving sprocket has 19 teeth and rotates at 1100rpm. The pitch of the chain is 18mm. Calculate the velocity of the chain.
a) 5.6m/s
b) 6.3m/s
c) 5.8m/s
d) 5.1m/s

Explanation: v=zpn/60×1000.

6. Calculate the pitch circle diameter of the driving pulley is pitch is given as 18mm and sprocket has 19 teeth.
a) 112.33mm
b) 109.36mm
c) 102.66mm
d) 105.33mm

Explanation: D=p/sin(180/z).

7. Driving and driven pulleys are rotating at 1000rpm and 500rpm. If number of teeth on driving sprocket are 20, find number of teeth in the driven sprocket.
a) 41
b) 40
c) 10
d) 11

Explanation: n₁z₁=n₂z₂.

8. If centre distance for a chain drive is 750mm with number of teeth on the driving and driven sprockets being 40 and 20 respectively, then calculate the number of links required. Given: Pitch is taken as 19mm.
a) 112
b) 110
c) 111
d) 109

Explanation: 2(a/p) + (z₁+z₂)/2 +( z₂- z₁/2π)²xp/a.

9. In silent chain sprocket teeth have a rectangular profile.
a) Yes rectangular
b) No trapezoidal
c) No circular
d) No hyperbolic

Explanation: They have a trapezoidal profile.

10. Roller chains have less reliability as compared to roller chains.
a) True
b) False

Explanation: Silent chains have laminated structure and hence are more reliable.

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