Ratio of angular velocity of the follower to the angular velocity of driving gear is known as

A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the torque on the gear C if number of teeth on gear A, B and C are 40, 70 and 30.

A

66N-m

B

68N-m

C

53N-m

D

45N-m

What is the effect of the base circle on the follower? I) Follower velocity increases with the base radius. II) Follower acceleration increases with the base radius. III) Follower velocity and acceleration do not depend on the base radius.

A

only I and II

B

only II

C

only III

D

only I

A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate the gear ratio.

A

5

B

4.6

C

5.2

D

4

The displacement and velocity diagrams of a cam and follower mechanism are shown as: Which of the following statements is/are correct? 1. The acceleration of the follower at the beginning and at the end of each stroke will be zero. 2. The follower remains at rest in the dwell period. 3. During period DE, the motion of the follower is retarding. Select the correct answer using the code given below.

A

1, 2 and 3

B

1 only

C

2 only

D

3 only

Following is the data for transmission system of a Gear box reduction ratios.
1^st gear - 4.3 : 1
2^nd gear - 3.00 : 1
3^rd gear - 2.71 : 1
4^th gear - 1 : 1
Final drive reduction is 5.0 : 1
The overall reduction when the vehicle is driven in 2^nd gear is

A

3.00 : 1

B

13.55 : 1

C

5 : 1

D

15 : 1

Velocity ratio is the ratio angular velocity of driving gear to that of driven gear.

A

True

B

False

Statement (I): When a flat-faced follower is used, it would be preferable to provide an offset in the plane perpendicular to the plane of rotation of the cam. Statement (II): Because of the offset, the follower is made to rotate continuously about its axis which in turn avoids jamming of the follower in its guide while moving up or down, reduces the wear of the follower flat surface and distributes the wear uniformly.

A

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (1)

B

Both Statement (-) and Statement (II) are individually true tut Statement (II) is NOT the correct explanation of Statement (1)

C

Statement (I) is true but Statement (II) false

D

Statement (I) is false but Statement (II) is true

What is the velocity ratio of two gears if the driver gear has angular velocity of 20m/s and driven gear has angular velocity of 10m/s?

A

2:1

B

3:2

C

4:3

D

5:1

What is the angular velocity of driven gear if the driver gear has angular velocity of 30m/s and velocity ratio of two gears is 3:2?

A

10m/s

B

20m/s

C

30m/s

D

40m/s

What is the velocity ratio of two gears if the driver gear has angular velocity of 15m/s and driven gear has angular velocity of 10m/s?

A

2:1

B

3:2

C

4:3

D

5:1

Ratio of angular velocity of the follower to the angular velocity of driving gear is known as

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