Machine Design problems
- 1. An open belt drive is used when
Options- A. shafts are arranged parallel and rotate in the opposite directions
- B. shafts are arranged parallel and rotate in the same directions
- C. shafts are arranged at right angles and rotate in one definite direction
- D. driven shaft is to be started or stopped whenever desired without interferring with the driving shaft Discuss
Correct Answer: shafts are arranged parallel and rotate in the same directions
- 2. A transmission shaft includes
Options- A. counter shaft
- B. line shaft
- C. over head shaft
- D. all of these Discuss
Correct Answer: all of these
- 3. In order to obtain the bolts of uniform strength, an axial hole is drilled through the head as far as the threaded portion such that the area of shank becomes equal to the root area of the thread.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. According to Guest's theory, the failure occurs at a point in a member when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in simple tension test.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. Circumferential joint in boilers is used to get the required length of a boiler.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. Surface endurance limit of gear material is dependent upon its
Options- A. elastic strength
- B. yield strength
- C. brinell hardness number
- D. toughness Discuss
Correct Answer: brinell hardness number
- 7. The load cup of a screw jack is made separate from the head of the spindle to
Options- A. enhance the load carrying capacity of the jack
- B. reduce the effort needed for lifting the working load
- C. prevent the rotation of load being lifted
- D. reduce the value of frictional torque Discuss
Correct Answer: prevent the rotation of load being lifted
- 8. A crankshaft is a __________ shaft.
Options- A. transmission
- B. machine Discuss
Correct Answer: machine
- 9. Which of the following statement is wrong?
Options- A. The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts
- B. The V-belt drive is used with large centre distance
- C. The V-belt may be operated in either direction with tight side of the belt at the top or bottom
- D. The ratio of driving tensions in V-belt drive is more than flat belt drives Discuss
Correct Answer: The V-belt drive is used with large centre distance
- 10. The ball bearings are provided with a cage
Options- A. to reduce friction
- B. to facilitate slipping of balls
- C. to prevent the lubricant from flowing out
- D. to maintain the balls at a fixed distance apart Discuss
Correct Answer: to maintain the balls at a fixed distance apart
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