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Two helical springs of the same material ( permissile shear stress is 5800 KN/cm^2 , and modulus of rigidity is 10000 KN/m^2 ) and free length are used to make a concentric spring. The concentric spring is compressed 2.8 cm by an axial load of 360 KN. Assuming that spring index of both springs is 7 foe each spring .
Determine for each spring :
load ,
stored energy ,
angular deflection ,
number of coils ,
wire diameter ,
spring diameter .
Draw a sketch for a hand lever of effective length= 600 mm , hand force = 100 N
tensile stress = 7000 N/m^2 , shear sress = 6000 N/m^2
Determine ;
shaft diameter in the boss and in the bearing ,
boss diameter and length ,
width and thickness of arm .
Determine handle diameter , lever arm cross-secion , and journal diameter if :
effort = 400 N
bending sterss = 50 N/mm^2
bear stress = 40 N/mm^2
Draw a sketch for a cranked lever of the following dimesions ;
handle length = 300 mm
lever arm length = 400 mm
overhang of the journal = 100 mm
Four horizontal, homogeneous, isotropic geologic formations, each 5m thick over lie one another. If the hydraulic conductivities are 10-4,10-6,10-4 and 10-6 respectively,, calculate the horizontal and vertical components of hydraulic conductivity for the equivalent homogeneous but anisotropic formation
A steam engine develops 600 kW at 180 r.p.m. The coefficient of fluctuation of energy is
found to be 0.5 and the fluctuation of speed is required to be kept within ±1% of the mean
speed. The maximum fluctuation of the energy during operation is given by:
A 10.000-in-diameter plunger slides in a 10.006-in-diameter cylinder, the annular space being
filled with oil having a kinematic viscosity of 0.004 ft2/s and specific gravity of 0.85. If the plunger
moves at 0.6ft/s, find the force, in lbf, when 9 ft is engaged in the cylinder
The arm AD of the excavator shown in Fig. 1.93 can be approximated as a steel tube of outer diameter 10 in., inner diameter 9.5 in., and length 100 in. with a viscous damping coefficient of 0.4. The arm DE can be approximated as a steel tube of outer diameter 7 in., inner diameter .5 in., and length 75 in. with a viscous damping coefficient of 0.3. Estimate the equivalent spring constant and equivalent damping coefficient of the excavator, assuming that the base AC is fixed.
A four stroke cycle diesel engine has a brake thermal efficiency of 0.32 and lower heat of combustion of fuel is 41200kJ/kg. Calculate the brake specific fuel of consumption and the brake mean effective pressure of the engine if the volumetric efficiency is 0.76, inlet density of charge is 1.05 kg/m3 and fuel air ratio
0.04,
is
The viscosity of a fluid is to be measured by a viscometer constructed of two 40-cm-long concentric cylinders, such that in the figure. The outer diameter of the inner cylinder is 12 cm, and the gap between the two cylinders is 0.15 cm. The inner cylinder is rotated at 300 rpm, and the torque is measured to be 1.8 N - m. Determine the absolute viscosity, Pa-s, of the fluid
