Pros and Cons

Question 1

A few couples

Answer 1

1. thread cutters
2. wingnut spanner
3. water sprays
4. door handles

Question 2

Pro and cons of gears

Answer 2

Pros:
1. zero slip drive
2. Mechanically strong.
3. Deliver high transmission efficiency.
4. More compact compared to belts and chains.

Cons:
1. expensive to make
2. needs lubrication
3. can only be used over short distances

Question 3

Pros and cons of belts

Answer 3

Pros:
1. Direction of driven shaft can easily be change by crossing the belt
2. belt drives are quiet
3. belt drives don’t require lubrication
4. The power output of a belt drive system may be varied

Cons:
1. Belt can slip
2. Short service life if not maintained well.
3. Finite speed range.
4. They need an idler pulley or some adjustment of center distance to compensate for belt stretching and wear.

Question 4

Pros and cons of chains

Answer 4

Pros:
1. No slip occurs
2. More durable than belts
3. Can be used over bigger distances than gear drives.

Cons:
1. More expensive to install
2. Requires lubrication
3. Noisy
4. Heavier than belts

Question 5

Lifting devices

Answer 5

1. Differential wheel and axle lifting device
2. Differential winch
3. Weston differential pulley (Block and Tackle)