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)

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

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

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

Which of the following is NOT true about Frictional force? A. Friction is the force which opposes the relative motion of two surfaces in contact. B. The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction. C. Friction in machines wastes energy and also causes wear and tear. D. Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction.

A

D

B

A

C

D

B

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 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 flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing and R = Radius of bearing surface)

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