Related Questions

In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.
A Thick film
B Thin film
C Either A or B
D None of these
A sliding bearing which operates without any lubricant present, is called
A Zero film bearing
B Boundary lubricated bearing
C Hydrodynamic lubricated bearing
D Hydrostatic lubricated bearing
If p = bearing pressure on projected bearing area, Z = absolute viscosity of lubricant and N = speed of journal, then the bearing characteristic number is given by
A $$\frac{{{\text{ZN}}}}{{\text{p}}}$$
B $$\frac{{\text{p}}}{{{\text{ZN}}}}$$
C $$\frac{{\text{Z}}}{{{\text{pN}}}}$$
D $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing
A Remains constant at all speeds
B Is minimum at zero speed and increases monotonically with increase in speed
C Is maximum at zero speed and decreases monotonically with increase in speed
D Becomes minimum at an optimum speed and then increases with further increase in speed
Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?
A 1 hour
B 2 hours
C 3 hours
D 4 hours
E 5 hours
Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness. Dry eyes were more frequently experienced by customers who wore contact lenses than by custorners who did not wear contact lenses. The pharmacists concluded that wearing contact lenses, by itself, can cause contact wearers to have dry eyes.
A An inherited condition can cause both weak eyesight and dry eyes
B Physical exertion causes dry eyes in many people who wear contact lenses.
C Most people who have dry eyes do not wear contact lenses.
D Most people who wear contact lenses do not have dry eyes.
The rolling contact bearings as compared to sliding contact bearings have
A Low starting and low running friction except at very high speeds
B Accuracy of shaft alignment
C Small overall dimensions
D All of the above
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called
A Hydrostatic lubricated bearing
B Hydrodynamic lubricated bearing
C Boundary lubricated bearing
D Zero film bearing
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 The lubricant is forced between the journal and the bearing, by external pressure
D There is no lubricant between the journal and the bearing
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when
A Wheel base of axles is more
B Degree of curvature is more
C Both (A) and (B)
D None of the above

Next steps