When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.

Two pulleys are connected by a belt. The sum of the diameter of two pulleys is 90 cm and while the one makes 50 rpm, the other makes 20 revolutions. What will be the diameter of the pulleys?

A

19.7cm, 70.3 cm

B

23.4 cm, 68.7 cm

C

25.7 cm, 64.3 cm

D

21.1 cm,63.2 cm

Two pulleys are connected by a belt. The sum of the diameters of the pulleys is 92.6 cm and while one makes 50 rev/min the other make 200 rev/min. What will be the diameter of the pulleys?

A

18.53 cm, 74.07 cm

B

19.65 cm, 64.89 cm

C

20.01 cm, 78.09 cm

D

17.69 cm, 69.90 cm

Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of a cross belt drive. The length of the belt is

A

$$\pi \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

B

$$\pi \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

C

$$\pi \left( {{{\text{r}}_1} - {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

D

$$\pi \left( {{{\text{r}}_1} - {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

Two pulleys of diameters d1 and d2 and at distance x apart are connected by means of an open belt drive. The length of the belt is

A

π /2 (d1 + d2) 2x + (d1 + d2)2/4x

B

π /2 (d1 – d2) 2x + (d1 – d2)2/4x

C

π /2 (d1 + d2) 2x + (d1 – d2)2/4x

D

π /2 (d1 – d2) 2x + (d1 + d2)2/4x

Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is

A

$$\pi \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

B

$$\pi \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

C

$$\pi \left( {{{\text{r}}_1} - {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

D

$$\pi \left( {{{\text{r}}_1} - {{\text{r}}_2}} \right) + \frac{{{{\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)}^2}}}{{\text{x}}} + 2{\text{x}}$$

The efficiency of flat belt drive is 35%. If all the parameters are same and flat belt is replaced by V belt, than the efficiency of V belt will be?

A

<35%

B

>35%

C

=35%

D

Cant be determined

In a flat belt drive, if the slip between the driver and belt is 1%, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

A

0.96

B

0.97

C

0.98

D

0.99

When two pulleys of different diameters are connected by means of an open belt drive, then the angle of contact taken into consideration should be of the

A

larger pulley

B

smaller pulley

C

average of two pulleys

D

none of the mentioned

A bucket wheel excavator with 20 buckets of capacity 0.5 m³ each, rotates at 5 rev/min. The bucket fill factor is 80%. The excavator loads on to 1200 mm wide belt conveyor. The cross-section area (m²) of the material on the belt is 0.1B², where B is the belt width in m. The minimum speed of the belt in m/s to avoid spillage of material is

A

7.23

B

5.79

C

4.63

D

3.7

The velocity ratio of two pulleys connected by an open belt or crossed belt is

A

directly proportional to their diameters

B

inversely proportional to their diameters

C

directly proportional to the square of their diameters

D

inversely proportional to the square of their diameters

When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.

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