About Belt Drives

When it comes to drivetrains, belt drives are one of the most popular options. They are found on everything from bicycles to motorcycles to cars.

Belt drives are composed of two pulleys, or drums, that are connected by a belt. The belt is usually made of rubber or polyurethane and is reinforced with Kevlar or other materials. The belt is wrapped around the pulleys and the tension between the two pulleys creates the driving force. One of the advantages of belt drives is that they are very efficient; up to 98% of the power from the engine can be transferred to the wheels.

Another advantage of belt drives is that they are low-maintenance. Unlike chain drives, which need to be lubricated and adjusted regularly, belt drives do not require any maintenance other than occasional inspection and replacement of the belt.

Belt drives have some disadvantages, as well. One is that they can slip if they get wet or muddy. Another is that they are not as strong as chain drives, so they are not suitable for applications where high torque is required. Overall, belt drives are a popular choice for many riders because of their efficiency and low maintenance requirements

Following are some of the multiple choice questions on the Belt Drives with answers that will help the students in developing their knowledge.

Belt Drives MCQ

1. Which of the following is not true about gear drives.

  • Positive drive
  • Constant velocity ratio
  • Transmit large power
  • Bulky construction

2. Belt drive is a flexible drive

  • True
  • False

3. The function of an idler pulley is to

  • Maintain the required tension
  • To increase the power transmission
  • connect the pulleys when angle of contact is very small
  • All the above

4. Due to slip of the belt, the velocity ratio of the belt drive

  • Decreases
  • Increases
  • Does not change
  • None of the above

5. What is the drive misalignment called that results when the sheaves are at a different angle with the vertical plane?

  • Parallel misalignment
  • Horizontal angular misalignment
  • Vertical angular misalignment
  • Planar misalignment

6. The teeth of the helical gears are cut parallel to the shaft axis

  • True
  • Flase

7. The included angle for V-belt is

  • 30 degree to 40 degree
  • 40 degree to 50 degree
  • 20 degree to 30 degree
  • 50 degree to 60 degree

8. Which parameters are represented by the two scales on a belt tension tester?

  • Deflection force and belt type
  • Deflection force and belt width
  • Deflection distance and small sheave diameter
  • Deflection force and belt span

9. The intermediate mechanisms which is used to transmit power from one place to another place

  • Pulley
  • Machine
  • Drive
  • Lever

10. In which type of belt drive multiple pulleys are mounted on a single shaft

  • Open belt drive
  • Cross belt drive
  • Compound belt drive
  • None of the above

11. Which of the following is not a material for belt drives

  • Leather
  • Balata
  • Rubber
  • Wood

12. Which of the following is not a material used for belt

  • Balata
  • Cotton
  • Rubber
  • Powder

13. Which of these belts are well suited for timing mechanisms?

  • Flat belt
  • V-belt
  • Synchronous belt
  • Multiple V-Belt

14. Which of the following drive has no Slip

  • Belt Drive
  • Rope Drive
  • Chain Drive
  • None of the Above

15. Which type of belt drives is used in compressors

  • Flat belt drives
  • V belt drives

16. What makes the pitch diameter of a sheave change?

  • The belt used
  • The distance between the shaft centers
  • The speed of the driving shaft
  • The belt tension

17. Which tool is used to check for sheave parallel alignment?

  • Straightedge
  • Combination square
  • Tape rule
  • Feeler gauge

18. What is a photo-reflective tachometer used for?

  • Measures the torque on a sheave.
  • Measures the speed of a sheave.
  • Takes a picture of a sheave as it rotates.
  • Measures the wear on a belt.

19. Which type of belt is used with sprockets?

  • F.H.P V-belt
  • Timing belt
  • Flat belts used on conveyors
  • Multiple V-belts

20. What should be used to clean belts?

  • A solvent
  • Soap and water
  • A glycerine/spirit mixture
  • Sandpaper

21. Which of the following can be used for Power transmission in intersecting shafts.

  • Spur Gear
  • Helical Gear
  • Bevel Gear
  • None of the above

22. V belts are suitable for

  • Short drives
  • Long drives

23. V belts are molded into

  • Circular shape
  • Triangular shape
  • Trapezoidal shape
  • None of the above

24. The included angle for v belt drive ranges from

  • 10 to 20 degree
  • 20 to 30 degree
  • 30 to 40 degree
  • All of above

25. If the driving sheave of a belt has an outside diameter of 6 inches and the driven sheave has an outside diameter of 3 inches, the driven sheave rotates

  • half as fast as the driving sheave
  • slower than the driving sheave
  • at the same speed as the driving sheave
  • impossible to tell from the given data

26. Gear drive don't require precise alignment of shaft.

  • True
  • False

27. Spur Gears are used for connecting two..................

  • Parallel and Coplanar Shafts
  • Non Parallel and Coplanar Shafts
  • Parallel and non coplanar Shafts
  • Intersecting and Coplanar Shafts

28. The cross section of V- belt is .............

  • Rectangular
  • Trapezoidal
  • Triangle
  • Circular

29. The stress Produced on the belt is..................

  • Tensile
  • Compressive
  • Shear
  • Bending

30. Flat belts are used for

  • Light Drives
  • Moderate Drives
  • Heavy Drives
  • None of these

31. These are the types of belt that normally used in industry, except :

  • Flat belt
  • V Belt
  • Circular Belt
  • Multiple Belt

32. In stepped or cone pulley drive

  • Driving pulley rotates at constant speed
  • Driven pulley rotates at constant speed
  • Both rotates at same speed
  • none of the above

33. In crossed or twist belt,

  • One of the Pulley runs slower than other pulley
  • Both pulleys rotate in the same direction
  • Both pulleys rotate in opposite direction
  • none of the above

34. In open belt,

  • One of the Pulley runs slower than other pulley
  • Both pulleys rotate in the same direction
  • Both pulleys rotate in opposite direction
  • none of the above

35. The belt drive which is used with shafts arranged parallel and rotating in same direction

  • Cross belt drive
  • Open belt drive

36. This type of drive is used to change the speed of the driven shaft while the driving shaft runs at constant speed

  • Cone pulley drive
  • cross belt drive
  • open belt drive
  • All of above

37. Velocity ratio of a belt drive is the ratio of speed of

  • Driving pulley to driven pulley
  • Driven pulley to driving pulley

38. Power is transferred between an electric motor and a pump with a belt drive. Calculate the required driven sheave pitch diameter and belt length if the motor and pump shafts are 20 inches apart and the pump shaft must rotate at 1800 r/minute. The driving sheave is installed directly on the motor shaft and has a pitch diameter of 5 inches. The plate on the motor indicates a nominal speed of 1000 r/minute.

  • Driven sheave pitch diameter is 2.8 inches and belt length is 52.2 inches.
  • Driven sheave pitch diameter is 9 inches and belt length is 52.2 inches.
  • Driven sheave pitch diameter is 9 inches and belt length is 62 inches.
  • Driven sheave pitch diameter is 2.8 inches and belt length is 62 inches.

39. The Power transmitted by a belt drive isWhere T1 and T2 are tensions in tight and slack side respectivelyN- speed , V - Velocity

  • (T1 - T2) x N
  • (T1 + T2) x N
  • (T1 - T2) / V
  • (T1 - T2 ) x V

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