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APJ Abdul Kalam Technological University D

|) semester M.Tech Degree Examination May-2016
Branch: Machine Design

01ME6112 Design of Power Transmission Elements
(2015 Scheme)
Time: 3 hours Max Marks: 60

Answer any two questionsfrom each PART

Use ofdata book is permitted Any data nol given may be suitably assumed

PARTA

|۸ four-cylinder diesel engine running at 2000 rpm developing 50 kW is being used to drive a medium
duty agricultural machine running at 890 rpm. The centre distance between the pulley centres is
approximately 75 cm. The expected use is less than 10 hours per day. Using a V- belt drive select
suitable pulley diameters and determine the type and number of belts required. (9)

2. Inamine, 100 kW power is transmitted from an induction motor running at 720 rpmto a hoist drive
shaft with a reduction ratio of4 through a chain drive. The motor shaft diameter is 60mm and the
hoist drive shaft diameter is 120mm. The motor starting load is 1.5 times the nominal load. Design
a suitable chain drive. (9)

3. A single plate clutch, both side being effective is required to connect a machine shaft to a driver
shaft which runs at 500 rpm .The moment of inertia of the rotating parts of the machine is kgm .
The inner and the outer radii of the friction discs are 50 mm and 100mm respectively. Assuming
uniform pressure of 0.1 N/mm and g —0.25, determine the time taken for the machine to reach full
speed when the clutch is suddenly engaged. Also determine the power transmitted by the clutch,
the energy dissipated during the clutch slip and the energy supplied to the machine during

engagement. (9)