The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r<sub>1</sub> and r<sub>2</sub> = External and internal radii of collar respectively)

The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)

A

$$\frac{1}{2}\mu {\text{W}}\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)$$

B

$$\frac{2}{3}\mu {\text{W}}\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)$$

C

$$\frac{1}{2}\mu {\text{W}}\left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$

D

$$\frac{2}{3}\mu {\text{W}}\left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$

The frictional torque transmitted in a flat pivot bearing, considering uniform 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

The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W = Load over the bearing, R = Radius of bearing)

A

μWR

B

$$\frac{3}{4}$$μWR

C

$$\frac{2}{3}$$μWR

D

$$\frac{1}{2}$$μWR

The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is
(Where μ = Coefficient of friction, W = Load over the bearing, R = Radius of bearing)

A

μWR

B

$$\frac{3}{4}$$μWR

C

$$\frac{2}{3}$$μWR

D

$$\frac{1}{2}$$μWR

A machine vice whose length of the handle is 150mm and the coefficient of friction for thread and collar are 0.15 and 0.17 respectively has a force applied at handle of 125N. Also the outer and inner diameters of collar are 55mm and 45mm respectively. Find the collar torque in terms of clamping force W assuming uniform wear theory if nominal diameter=22mm and pitch=5mm.

A

4.5W

B

5.4W

C

4.25W

D

3.37W

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

In the case of the design of friction clutches, the uniform rate of wear theory is used over uniform pressure. The reasons may be the following: 1. It gives lower frictional torque. 2. It gives higher frictional torque. 3. The intensity of pressure is maximum at the inner radius and minimum at the outer radius of the friction or contact surfaces. 4. This concept is prevalent for running and old clutches. Which of the above reasons is correct?

A

1, 3 and 4

B

1 and 3 only

C

2 and 3

D

2 and 4

Three persons P,Q and R wore shirts of White, Black and Blue colours (not necessarily in that order) and pants of Green, Red and Whitecolours (not necessarily in that order). No persons wore shirts and pants of same colour. And further it is given that 1.A did not wear shirt of Black colour.
2.B did not wear shirt of Blue colour.
3.C did not wear shirt of White colour.
4.A did not wear pants of Green colour.
5.B wear pant of White colour. What were the colours of the pant and shirt wear by person A respectively?

A

Green and Blue

B

White and Black

C

Red and White

D

Green and White

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 collar bearing, considering uniform wear, is (where r₁ and r₂ = External and internal radii of collar respectively)

Related Questions

The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r1 and r2 = External and internal radii of collar respectively)

Related Questions

The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = External and internal radii of collar respectively)