The bevel gears used for connecting non intersecting shafts are

Consider the following statements: The axis of spiral bevel gear are non-parallel and intersecting. 1) The most common pressure angle for spiral bevel gear is 20° 2) The most common spiral angle for spiral bevel gear is 35. 3) Spirals bevel gears are generally interchangeable. 4) Spirals are noisy and recommended for low speeds of 10 m /s. Which of the above statements are correct?

A

1 and 4

B

1 and 2

C

2 and 3

D

3 and 4

Statement (I): Two non-intersecting and non-parallel, i.e., non-coplanar, shafts connected by gears are called skew-bevel gears or spiral gears, and this type of gearing has a line contact the rotation of which about the axes generates the two hyperboloid pitch surfaces. Statement (II): A hyperboloid is a 3D surface formed by revolving a straight line about an axis (not in the same plane), such that every point on the line remains at a constant distance from the axis.

A

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

B

Both Statement I) and Statement II) are individually true but Statement II) is not the correct explanation of Statement I)

C

Statement I) is true but Statement II) is false

D

Statement I) is false but Statement II) is true

Bevel gears used for connecting intersecting shafts at 900 and having speed ratio 1 : 1 is known as

A

bevel gears

B

beveloid gears

C

mitre gears

D

none of the mentioned

When bevel gears having equal teeth connect two shafts whose axes are mutually perpendicular, then the bevel gears are known as

A

Skew bevel gears

B

Spiral gears

C

Miter gears

D

Zero bevel gears

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

A

Crown bevel gears

B

Angular bevel gears

C

Mitre gears

D

Internal bevel gears

Bevel gears having equal number of teeth and equal pitch angles connect two orthogonally intersecting shafts. This system of gears is known as

A

Crown gears

B

Hypoid gears

C

Worm gears

D

Mitre gears

A pair of bevel gears is mounted on two intersecting shafts who have a shaft angle of 70°. The velocity ratio of the gears is 2. Find the pitch angles.

A

42.21°, 27.79°

B

48.14°, 21.86°

C

39.29°, 30.71°

D

46.95°, 23.05°

A pair of bevel gears is mounted on two intersecting shafts who have a shaft angle of 80°. The gear ratio of the gears is 1/3. Find the pitch angles.

A

62.76°, 17.24°

B

49.31°, 30.69°

C

56.97°, 23.03°

D

64.63°, 15.37°

Tapered involute gears which can couple intersecting shafts, skew shafts, and parallel shafts are known as

A

bevel gears

B

beveloid gears

C

mitre gears

D

none of the mentioned

Bevel gears are used to have a gear drive between two intersecting shafts. True or false?

A

True

B

False

The bevel gears used for connecting non intersecting shafts are

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