The bearing characteristic number is given by (where p = Bearing pressure on the projected bearing area, Z = Absolute viscosity of the lubricant, and N = Speed of the journal)

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ME Set-1
Machine Design
137

Machine Design MCQ with Answers

137) The bearing characteristic number is given by (where p = Bearing pressure on the projected bearing area, Z = Absolute viscosity of the lubricant, and N = Speed of the journal)

(pZ)/(N)

(pN)/(Z)

(p)/(ZN)

(ZN)/(p)

Answer is:

(ZN)/(p)

Machine Design MCQ with Answers

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138) The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

it is subjected to a higher stress than the outer side

it is subjected to a higher cyclic loading than the outer side

it is more stretched than the outer side during the manufacturing process

it has a lower curvature than the outer side

Answer is:

it is subjected to a higher cyclic loading than the outer side

139) In a marine flange coupling, the thickness of flange is taken as

d/4

d/3

d/2

3 d/4

Answer is:

d/3

140) The wire ropes make contact at

bottom of groove of the pulley

sides of groove of the pulley

sides and bottom of groove of the pulley

anywhere in the groove of the pulley

Answer is:

bottom of groove of the pulley

141) A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

5 mm

10 mm

15 mm

25 mm

Answer is:

25 mm

Machine Design MCQ with Answers

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137) The bearing characteristic number is given by (where p = Bearing pressure on the projected bearing area, Z = Absolute viscosity of the lubricant, and N = Speed of the journal)

(ZN)/(p)

Machine Design MCQ with Answers

Related Machine Design MCQ with Answers

138) The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

it is subjected to a higher cyclic loading than the outer side

139) In a marine flange coupling, the thickness of flange is taken as

d/3

140) The wire ropes make contact at

bottom of groove of the pulley

141) A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm2. If the permissible tensile stress in the metal is 20 N/mm2, then the thickness of the metal required for making the pipe will be

25 mm

Machine Design MCQ with Answers

141) A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be