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Machine Design
Basic Machine Design
Quiz 1
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Q.1
Static load is defined as the load acting on the bearing when shaft is _____
a) Stationary
b) Rotating at rpm<10
c) Rotating at rpm<5
d) None of the listed
Q.2
A total permanent deformation of 0.of the ball diameter is taken for considering static load capacity of the shaft.
a) True
b) False
Q.3
Stribeck equation gives dynamic load capacity of the bearing.
a) True
b) False
Q.4
Which of the following is expression for stribeck equation?(Number of balls=z)?
a) C=kd²z/5
b) C=kd²z/15
c) C=kd²z/10
d) None of the listed
Q.5
The life of an individual ball bearing is the time period for which it works without any signs of failures.
a) True
b) False
Q.6
For majority of bearings, actual life is considerably greater than rated life.
a) True
b) False
Q.7
The dynamic load carrying capacity of a bearing is defined as the radial load in radial bearings that can be carried for a minimum life ofrevolutions.
a) True
b) False
Q.8
In the expression of dynamic load capacity P=XVF(r) + YF(a), V stands for ?
a) Race rotation factor
b) Radial factor
c) Thrust factor
d) None of the listed
Q.9
Calculate the bearing life if expected life forbearings isand shaft is rotating at 1500rpm.
a) 850 million rev
b) 810 million rev
c) 810 h
d) 850h
Q.10
The bearing is subjected to a radial load of 4000N. Expected life forbearings isand shaft is rotating at 1500rpm. Calculate the dynamic load capacity.
a) 42.21kN
b) 37.29kN
c) 26.33kN
d) 35.22kN
Q.11
A rolling contact bearing is specified as XCalculate the bearing diameter.
a) 35mm
b) 28mm
c) 21mm
d) 7mm
Q.12
A rolling contact bearing is specified as XDetermine the series.
a) Extra light series
b) Light series
c) Medium series
d) Heavy series
Q.13
Needles bearing consist of rollers of small diameter and very small length.
a) True
b) False
Q.14
Extreme pressure causes ______ wear in the bearing parts.
a) Abrasive
b) Corrosive
c) Pitting
d) All of the mentioned
Q.15
Scoring is a ________ phenomenon.
a) Stick-slip
b) Fracture
c) Fatigue
d) In-out
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