1. Choose the pest answer for the following:

Taper on a rectangular key is

1 in10

1 in 16

1 in 4

1 in 100

The sleeve of a Muff Coupling is designed as

Solid shaft

Tapered shaft

Hollow shaft

Thick cylinder

The stresses produced in the belt drive are

Shear stresses

Compressive

Tensile

Both Tensile and Compressive

For a given number of teeth, speed of the sprocket reduces as the Chain Pitch

Increases

Decreases

Remains constant

All of the above

The gears are termed as medium velocity gears, if their peripheral velocity is

1-3m/sec

3 -15 m/sec

15-30 m/sec

30-50 m/sec

Helix angle for "a single helical gear ranges from

10° to 15°

15° to 20°

20° to 35°

35° to 50°

If b denotes the face width and L denotes the cone distance, then Bevel factor is written as





b/L

L/b

Find the diameter of a solid shaft to transmit 20 kW 200 rpm. The ultimate shear stress for steel may be taken as 360 MPa and factor of safety as 8. If a hollow shaft is to be needed in place of the solid shaft, find the inside and outside diameter when the inside to outside diameter is 0·50

Give the classification of different shafts and their application.

With a suitable sketch, explain the classification of keys and give the application of any two keys.

Design the rectangular key for a shaft of 50 mm diameter. The shearing and crushing stresses for key material are 42 MPa and 70 MPa.

Derive the Geometric relationship for the length of an open belt drive. Assume suitable data.

Describe the advantages and disadvantages of V-Belts.

Explain the advantages and disadvantages of chain drives.

Explain the construction of wire ropes with suitable diagrams.

With a suitable sketch, explain the terminology associated with spur gears.

A bronze spur pinion rotating at 600 rpm, drives a CI spur gear at a transmission ratio 4 1. The allowable static stress for bronze pinion· and cast iron. spur gear are 84 MPa and 105 MPa respectively. The pinion has 16 standard 20° full depth involute teeth of module 8 mm. Face width of both the gears is 50 mm. Find the power that could be transmitted from the point of view of strength.

Explain the Gear Hobbing process with a suitable sketch.

Determine the face width of a pair. of helical gears which is ·16 times the module from the data given below

Power P 15 kW,
Teeth 20° full depth involute,
Helix angle.
Speed of pinion 10,000 rpm,
Pitch circle diameter of pinion 80 mm,
Pitch circle diameter of gear 320 mm.
Allowable static strength 00 100 MPa.

With suitable sketches, explain the different types of Bevel gears.

Explain the different methods of lubricating worm gears.