In block brakes, the ratio of shoe width to wheel diameter is taken between

A circular wheel 28 inches in diameter rotates the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minutes does the larger wheel make in terms of x?

A

12x

B

24x

C

36x

D

48x

A circular wheel 28 inches in diameter rotates (moves) the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minute does the larger wheel make in terms of x?

A

12x

B

48x

C

24x

D

36x

A wheel that has 6 cogs is meshed with a wheel of 14 cogs. When the smaller wheel has made 21 revolutions the number of revelution made by the larger wheel is --

A

4

B

9

C

12

D

49

The fundamental equation for correct steering is (where $$\varphi $$ and $$\alpha $$ = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles and d = Wheel base)

A

$$\sin \varphi + \sin \alpha = \frac{{\text{b}}}{{\text{c}}}$$

B

$$\cos \varphi - \sin \alpha = \frac{{\text{c}}}{{\text{b}}}$$

C

$$\cot \varphi - \cot \alpha = \frac{{\text{c}}}{{\text{b}}}$$

D

$$\tan \varphi + \cot \alpha = \frac{{\text{b}}}{{\text{c}}}$$

A wheel that had 6 cogs in meshed with a larger wheel if 14 cogs. When the smaller wheell had made 21 revolutions, the number wheel will be-

A

5

B

8

C

10

D

9

For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$\theta $$ = Semi-block angle)

A

$$\frac{{2\mu \sin \theta }}{{\theta + \sin \theta }}$$

B

$$\frac{{\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

C

$$\frac{{4\mu \sin \theta }}{{\theta + \sin \theta }}$$

D

$$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

The diameter of a wheel is 63 cm. Distance traveled by the wheel in 100 revolutions is ----

A

99 meters

B

198 meters

C

63 meters

D

136 meters

A wheel makes 1000 revolutions in covering a distance of 88 km. The diameter of the wheel is -

A

28m

B

40m

C

14m

D

10m

The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 km per hour?

A

200

B

250

C

300

D

350

A man travels 22 miles in a motorcycle. If the diameter of the wheel is 2 ft then how many times has the wheel has rotated?

A

4620

B

9240

C

18480

D

5560

In block brakes, the ratio of shoe width to wheel diameter is taken between

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