This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Hydrodynamics Bearings”.
Explanation: BC is the condition of thin film and hence surfaces are not completely separated.
Explanation: In CD thick film of lubrication has developed.
Explanation: It is minimum at the transition zone.
Explanation: BCN modulus is the the BCN number corresponding to the minimum coefficient of friction.
Explanation: Due to low viscosity, lubricant will not separate the two surfaces resulting in partial contact.
7. The fundamental equation for viscous flow is given by ∆pbhᵌ/6µl where symbols have their usual meanings.
a) 6 is to be replaced by 3
b) 6 is to be replaced by 12
c) 6 is to be replaced by 9
d) 6 is to be replaced by 15
Explanation: It is givenby ∆pbhᵌ/12µl.
8. A single transverse weld is preferred over double transverse fillet weld.
Explanation: A single transverse weld is not preferred because the edge of the plate which is not welded can warp out of shape.
9. Transverse fillet weld can be designed using the same equations as of parallel fillet weld.
Explanation: Vice versa is true as strength of transverse fillet weld is greater than that of parallel fillet weld.
Sanfoundry Global Education & Learning Series – Machine Design.
To practice all areas of Machine Design, here is complete set of 1000+ Multiple Choice Questions and Answers.