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

When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

A

angular bevel gears

B

crown bevel gears

C

internal bevel gears

D

mitre gears

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

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 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

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

There are six friends who have different height and they stand according to their height information as given below. Q is greater than P and S. M is greater than P. T is greater than P who is greater than O. M is greater than Q. T is smaller than Q. Who among the following is the smallest in height?

A

O

B

T

C

M

D

(S) or (O)

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°

It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by

A

Universal joint

B

Knuckle joint

C

Oldham's coupling

D

Flexible coupling

These gears transmit power between shafts whose axes intersect at any angle:

A

Worm gears

B

Spur gears

C

Bevel gears

D

Racks

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

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