Related Questions

The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.
A Less
B More
C Same
D None of these
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
A 1/2 × μ.W. R cosec α
B 2/3 × μ.W. R cosec α
C 3/4 × μ.W. R cosec α
D μ.W.R cosec α
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
A $$\frac{1}{2}\mu {\text{Wcosec}}\alpha \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)$$
B $$\frac{2}{3}\mu {\text{Wcosec}}\alpha \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)$$
C $$\frac{1}{2}\mu {\text{Wcosec}}\alpha \left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$
D $$\frac{2}{3}\mu {\text{Wcosec}}\alpha \left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$
The frictional torque transmitted in a flat pivot bearing, considering uniform pressure is
A 1/2 × μ. W. R
B 2/3 × μ. W. R
C 3/4 × μ. W. R
D μ. W. R
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.
A Less
B More
C Same
D None of these
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 $$\mu {\text{WRcosec}}\alpha $$
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is
A $$\frac{1}{2}\mu {\text{Wcosec}}\alpha \left( {{{\text{r}}_{\text{1}}} + {{\text{r}}_{\text{2}}}} \right)$$
B $$\frac{2}{3}\mu {\text{Wcosec}}\alpha \left( {{{\text{r}}_{\text{1}}} + {{\text{r}}_{\text{2}}}} \right)$$
C $$\frac{1}{2}\mu {\text{Wcosec}}\alpha \left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$
D $$\frac{2}{3}\mu {\text{Wcosec}}\alpha \left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$
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 $$\frac{{\text{r}}}{2}\cos \varphi $$
In a flat collar pivot bearing, the moment due to friction is proportional to
A $$\frac{{{\text{r}}_1^2 - {\text{r}}_2^2}}{{{{\text{r}}_1} - {{\text{r}}_2}}}$$
B $$\frac{{{\text{r}}_1^2 - {\text{r}}_2^2}}{{{{\text{r}}_1} + {{\text{r}}_2}}}$$
C $$\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}$$
D $$\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{{\text{r}}_1} - {{\text{r}}_2}}}$$
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
A Remain horizontal
B Slant up towards direction of pull
C Slant down towards direction of pull
D None of the above

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