Q1) A new computer drive is proposed to have a disc, as shown in Fig. 1. The dise is to rotate at9,000 rpm, and the reader head is to be positioned 0.011 in. above the surface of the disc. Estimatethe shearing force on the reader head as a result of the air between the disc and the head. Use v air =1.47 x 10-5 m2/s.Stationary reader head6 mm dia.9,000 rpm0.011 mm55 mmRotating discFig. (1).

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Answered: QI) A new computer drive is proposed to…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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2.5-L bench scale bioreactor is used for the production of recombinant P64K protein from Neisseria meningitides. The dimensions for the bioreactor are Dt 12.9 cm, ratio Di/Dt = 1/3 and N = 700 rpm. With the scale up factor of 2.24, determine the impeller tip speed (m/s) for the pilot scale bioreactor based on constant impeller tip speed and constant power consumption per volume. Predict which scale up method might give a higher concentration of P64K, if the demand of dissolved oxygen plays an important role.
A double acting reciprocating pump running at 40 rpm is discharging 1.0 m3/ minute. The pump has a stroke of 400 mm. The diameter of the piston is 200 mm. The delivery and suction heads are 20m and 5m respectively. Find the slip of the pump and power required to drive the pump.
A double acting cylinder has a system pressure of 0.1750 kN/cm to produce an extraction force of 0.065 MN and Retraction force of 49 KN. The available extension velocity is 16500 m/min. (a) Find the diameter piston in mm (b) Find the diameter of ram in mm for the same system pressure. (C) Flow rate in Ipm (d) Retraction velocity E A- BI E
A certain fan delivers 340 m3/min of air at a static pressure of 25.4 mm of water gagewhen operating at a speed of 400 rpm and requires an input of 3 kW. If in the sameinstallation 425 m/min of air are desired, what will be the new static pressure in termsof mm of water and fan power required?
The rms speed of the molecules of a gas at 149 °C is 217 m/s. Calculate the mass m of a single molecule in the gas. m = kg - TOOLS x10
Example: In a 45° bend a rectangular air duct of 1 m? cross-sectional area is gradually reduced to 0.5 m² area. Find the magnitude and direction of force required to hold the duct in position if the velocity of flow at 1 m? section is 10 m/s, and pressure is 30 kN/m². Take the specific weight of air as 0.0116 kN/m³. Solution: Fay 45° Fzx PA, cos 45° 45° Vzcos 45° 2. 45°
4. A centrifugal pump delivers water to a height of 22 metres at a speed of 800 r.p.m. The velocity of flow is constant at a speed of 2-0 m/s and the outlet vane anglc is 45°. If the pump discharges 225 litres of water per second, find the diameter of the impeller and width of the impcller at oudet. (Ans. 375 mm: 95 mm)
Wind at standard atmospheric pressure and 15°C temperature has a velocity of 20 m/s. The turbine has a diameter of 60 m and its operating speed is 50 rpm at maximum power coefficient (take CP=0.593). Calculate: a. The total power density in the wind stream (kW/m2) b. The maximum power density assuming overall efficiency = 40% c. The total power produced in kW assuming overall efficiency = 40%
1. A wheel tractor has a 200 HP engine. Calculate the available rimpull of this tractorif it is operating at an altitude of 1,000 m. above sea level, at an averagetemperature of 25oC, and at an average speed of 12 km/hr. Take rimpull efficiencyas 85%.2. The weight of the wheel tractor in Problem 1 is 30 tons and the weight on the drivingwheels is 50% of this weight. What is the maximum available rimpull if thecoefficient of traction is 0.25?3. What is the maximum grade that the tractor in Problems 1 and 2 can climb if it ismoving on a surface with a rolling resistance of 150 kg/ton?4. Assume that the tractor in Problems 1, 2, and 3 is moving down a 8% grade. Howmany minutes are necessary to accelerate to the average speed of 5 km/hr in firstgear? Use a rimpull reduction factor of 75% in your calculations.
The nominal power of the wind turbine is 2 MW at wind speed 11.5m/s, generator efficiency is 94%, gear box efficiency is 65%, power coefficient of blades is 59%. What would be the diameter of the rotor? (Given: density of air = 1.225 kg/m3) %3D
1 (a) A plate 0.05mm distant from a fixed plate moves at 1.15 m/s and required a force per unit area of 2.7 N/m2 to maintain this speed with using an oil of specific gravity 0.75. Find the dynamic viscosity and kinematic viscosity of the fluid between the plates. 1 (b) Calculate the specific weight, density, and the specific gravity of a liquid having a volume of 665150 cm³ and weight of 71 kN (ENTER ONLY THE VALUES BY REFERRING THE UNITS GIVEN) 1 (a) The dynamic viscosity of the fluid (in Centipoise) The kinematic viscosity of the fluid (in stokes) 1 (b) Specific Weight in (kN/m3) Density of liquid (in kg/m2) Specific gravity of liquid Windows bu
The power provided by a centrifugal pumo is given by P=mgh where P = power/watts m = mass flow rate, kg/s g= gravitational acceleration, m/s² h = pump head,m prove that this equation is dimensionally homogeneous

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