Mechanical Engineering - Machine Design

41. 

In a hydrodynamic lubricated bearing

A. there is a thick film of lubricant between the journal and the bearing
B. there is a thin film of lubricant between the journal and the bearing
C. there is no lubricant between the journal and the bearing
D. the lubricant is forced between the journal and the bearing, by external pressure

Answer: Option A

Explanation:

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42. 

Which of the following statement is correct for gears?

A. The addendum is less than dedendum
B. The pitch circle diameter is equal to the product of module and number of teeth
C. The pitch circle is always greater than the base circle
D. all of the above

Answer: Option D

Explanation:

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43. 

A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

A. less than 20 d
B. greater than 30 d
C. between 20 d and 30 d
D. equal to inside diameter of pipe

Answer: Option C

Explanation:

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44. 

Stress concentration is caused due to

A. variations in load acting on a member
B. variations in properties of materials in a member
C. abrupt change of cross-section
D. all of these

Answer: Option C

Explanation:

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45. 

The resistance to fatigue of a material is measured by

A. elastic limit
B. Young's modulus
C. ultimate tensile strength
D. endurance limit

Answer: Option D

Explanation:

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