Q. 39 A hydrodynamic journal bearing is subject to 2000 N load at a rotational speed...

   

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Q. 39 A hydrodynamic journal bearing is subject to 2000 N load at a rotational speed of 2000 rpm. Both bearing bore diameter and length are 40 mm. If radial clearance is 20 m and bearing is lubricated with an oil having viscosity 0.03 Pa.s, the Sommerfeld number of the bearing is Q. 40 A 200 mm long, stress free rod at room temperature is held between two immovable rigid walls. The temperature of the rod is uniformly raised by 250C . If the Young's modulus and coefficient of thermal expansion are 200 GPa and 1 x 10-5/C, respectively, the magnitude of the longitudinal stress (in MPs) developed in the rod is Q. 41 1.5 kg of water is in saturated liquid state at 2 bar (V = 0.001061 m/kg, Uf = 504.0 kJ/kg, hr = 505 kJ/kg). Heat is added in a constant pressure process till the temperature of water reaches 400C (v = 1.5493 m/kg, u = 2967.0 kJ/kg , h=3277.0 kJ/kg). The heat added (in kJ) in the process is Q. 39 A hydrodynamic journal bearing is subject to 2000 N load at a rotational speed of 2000 rpm. Both bearing bore diameter and length are 40 mm. If radial clearance is 20 m and bearing is lubricated with an oil having viscosity 0.03 Pa.s, the Sommerfeld number of the bearing is Q. 40 A 200 mm long, stress free rod at room temperature is held between two immovable rigid walls. The temperature of the rod is uniformly raised by 250C . If the Young's modulus and coefficient of thermal expansion are 200 GPa and 1 x 10-5/C, respectively, the magnitude of the longitudinal stress (in MPs) developed in the rod is Q. 41 1.5 kg of water is in saturated liquid state at 2 bar (V = 0.001061 m/kg, Uf = 504.0 kJ/kg, hr = 505 kJ/kg). Heat is added in a constant pressure process till the temperature of water reaches 400C (v = 1.5493 m/kg, u = 2967.0 kJ/kg , h=3277.0 kJ/kg). The heat added (in kJ) in the process is