Related Questions

The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$  = Coefficient of friction between the shaft and bearing)
A $${\text{r}}\sin \varphi $$
B $${\text{r}}\cos \varphi $$
C $${\text{r}}\tan \varphi $$
D $$\frac{{\text{r}}}{2}\cos \varphi $$
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.
A Twice
B Four times
C Eight times
D Sixteen times
The bearing characteristic number in a hydrodynamic bearing depends upon
A Length, width and load
B Length, width and speed
C Viscosity, speed and load
D Viscosity, speed and bearing pressure
By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than usual. His usual time is :
A 30 minutes
B 75 minutes
C 45 minutes
D 60 minutes
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
A 0.5 D
B D
C 1.5 D
D 2 D
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)
A $$\frac{{\text{d}}}{8}$$
B $$\frac{{\text{d}}}{6}$$
C $$\frac{{\text{d}}}{4}$$
D $$\frac{{\text{d}}}{2}$$
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and $$I$$ = Mass moment of inertia of the disc attached at the end of a shaft)
A $$2\pi \sqrt {\frac{{\text{q}}}{I}} $$
B $$2\pi \sqrt {{\text{q}}I} $$
C $$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$
D $$\frac{1}{{2\pi }}$$
The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as
A Bending moment
B Twisting moment
C Torsional rigidity
D Flexural rigidity
In a hydrodynamic journal bearing, there is
A A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
B A thick film of lubricant between the journal and the bearing
C No lubricant between the journal and the bearing
D A forced lubricant between the journal and the 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

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