Chain Drives 1

This type of chain is suited for light weight, low speed applications.

• roller chain

• silent chain

• rollerless chain

• heavy duty chain

A number 40-3 chain has the following characteristics:

• a pitch of 0.5 inches and three strands

• a pitch of 4 inches and three strands

• a pitch of 0.5 inches and is of the heavy duty type

• a pitch of 4 inches and is of the heavy duty type

The tool used to break a chain is called a

• chain breaker

• chain puller

• chain link

• no tool is available

It is desirable that the chain wrap around the smaller sprockets be

• exactly 60 degrees

• less than 90 degrees

• approximately 120 degrees

• any amount of chain wrap is acceptable

This component is used to connect the two ends of a chain with an even number of links

• roller

• connecting link

• chain extension

• chain locker

If the driving sprocket of a chain drive has 30 teeth and the driven sprocket has 20 teeth, the driven sprocket rotates

• 0.67 times faster than the driving sprocket

• 1.5 times as fast as the driving sprocket

• slower than the driving sprocket

• at the same speed as the driving sprocket

The sag on a chain is measured with

• a photo reflective tachometer

• a dial caliper

• a tape rule

• a rule

Chain drives should receive maintenance

• once a year

• every 500 hours of operation

• only when a problem occurs

• every 1000 hours of operation

Power is transferred between an electric motor and a pump with a chain drive. Calculate the required number of driven sprocket teeth and chain length if the motor and pump are 20 inches apart, and the driven shaft must rotate at 1800 r/min. The driving sprocket is installed directly on the motor shaft and has 30 teeth. The plate on the motor indicates a nominal speed of 1000 r/min. The chain has a pitch of 0.5 inches.

• The driven sprocket has 17 teeth and the chain length is 51.3 inches

• The driven sprocket has 54 teeth and the chain length is 57.7 inches

• The driven sprocket has 17 teeth and the chain length is 57.7 inches

• The driven sprocket has 54 teeth and the chain length is 51.3 inches

Compared to chain drives, belt drives

• require lubrication

• are quieter

• can transmit higher torques levels

• can be dismounted without dismantling other machine parts