00000A U401121901

Total heat developed= 351.56kJ/s; Thermal capacity of oil= 2.092kJ/kgK; Oil
density = 900kg/m’; Volumetric efficiency of oil pump 770%; Gear
module=4.5mm; No. of gear teeth =7; Peripheral velocity of the gear outer
diameter= 6.36m/s; the oil working pressure =80 x 107 Pa; Mechanical
efficiency of the pump= 91%, Co-efficient of contraction= 1.0; Centrifuge
capacity = 20% of total capacity; Centrifuge nozzle diameter =2mm; Distance
from nozzle axis to the rotor rotation axis = 40mm; Moment of resistance at the
beginning of rotor rotation= 1:102 Nm; Rate of increase of moment growth= 6x
10° 7117/1017; Rotor axle radius = 8mm; Co-efficient of oil flow through the
nozzle= 83%; Co-efficient of hydraulic losses= 0.15; Co-efficient of heat
transfer from oil to the cooler= 250W/m°K; Cooler wall thickness =0.2mm; Co-
efficient of wall heat conductivity= 100W/m K; Co-efficient of heat transfer
from cooler wall 10 water= 3200 W/m’K; Mean temperature of oil and water in
the cooler is 358K and 348K respectively.

PART C
Answer any two full questions, each carries 20 marks.
Design a cooling system considering the following details: Amount of heat

carried away by water= 60510J/s; Mean specific heat of water= 4187J/kgkK;
Head produced by pump= 90kPa; Pump speed =3600rpm; Temperature
difference of water= 10K; Volumetric efficiency of pump=80%; Water velocity
at inlet= 2m/s; Impeller hub radius- 15mm; Angle between u2 and ٢ے‎ 12°, Angle
between 0) and w= 45°, Hydraulic coefficient= 0.68; Angle between प] and
v\=90°; No. of blades of the impeller =4; Blade thickness= 3.2mm; Mechanical
efficiency of pump= 85%; mean specific heat of air=1000kg/m*; Flow rate of
water passing through the radiator= 0.00151m*/s; Temperature difference of the
air in the radiator grille= 24°C; Head produced by the fan= 800Pa; Air velocity
upstream radiator= 22m/s; The fan employs flat blades and is riveted type.

Select a 9 speed gearbox to provide output speeds between 280 and 1800 rpm.
The input power is 5.5kW @1400rpm. Draw the kinematic layout and the speed
diagram.

Find the number of teeth of gears and provide the final kinematic arrangement

marking number of teeth. Take minimum number of teeth as 15.

aK

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