Related Questions

In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
A Double
B Four times
C Eight times
D Sixteen times
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is
A $$\frac{{\mu {\pi ^3}{{\text{N}}^2}{{\text{R}}^2}}}{{1800{\text{t}}}}$$
B $$\frac{{\mu {\pi ^3}{{\text{N}}^2}{{\text{R}}^4}}}{{1800{\text{t}}}}$$
C $$\frac{{\mu {\pi ^3}{{\text{N}}^2}{{\text{R}}^2}}}{{3600{\text{t}}}}$$
D $$\frac{{\mu {\pi ^3}{{\text{N}}^2}{{\text{R}}^4}}}{{3600{\text{t}}}}$$
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 $$\frac{{\text{r}}}{2}\cos \varphi $$
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing and R = Radius of bearing surface)
A $$\frac{1}{2}$$μWR
B $$\frac{2}{3}$$μWR
C $$\frac{3}{4}$$μWR
D μWR
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 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
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft and $$\alpha $$ = Semi-angle of the cone)
A $$\frac{1}{2}\mu {\text{WRcosec}}\alpha $$
B $$\frac{2}{3}\mu {\text{WRcosec}}\alpha $$
C $$\frac{3}{4}\mu {\text{WRcosec}}\alpha $$
D $$\mu {\text{WRcosec}}\alpha $$
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 $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
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 property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as
A Bondability
B Embeddability
C Comformability
D Fatigue strength

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