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Carrier velocity and conductivity. A power device is made of silicon and carries a current of 100 A The size of the device is 10 mm x 10 mm and is 1 mm thick. The potential drop on the device is 0.6 V.
(a) What is the conductivity of the silicon used.
(b) If the velocity of the carriers is 2000 m/s, how many free charges (electrons) must be present in the device at all times?
Calculate the ?S for the transfer of one mole of octane to water using the change in multiplicities assumed for the first shell of water molecules surrounding the molecules.
Find the implied adsorption isotherm, and show under what conditions it reduces to the Langmuir isotherm.
A three-phase, wye-connected, cylindrical-rotor, synchronous motor, with negligible armature resistance and a synchronous reactance of 1.27 Ω per phase, is connected in parallel with a three phase, wye-connected load taking 50 A at 0.707 lagging p..
A condenser is required to condense n-propanol vapour leaving the top of adistillation column. The n-propanol is essentially pure, and is a saturated vapourat a pressure of 2.1 bara. The condensate needs to be sub-cooled to 45ŽC.Design a horizonta..
what is the ratio of the adsorbent used to the solution feed rate proceed?
It is desired to use 28.32 m 3 /min of air (metered at a pressure of 101.3 kPa and 294.1 K) in a process. This amount of air which is at rest enters the fan suction at a pressure of 741.7 mm Hg and a temperature of 366.3 K and is discharged at a pres..
If the down time per cycle for emptying, cleaning, and recharging is 6 h, how long should the evaporator be operated between cleanings in order to obtain the maximum amount of product per 30 days?
For a coil current I (dc), derive an expression for the force on the plunger.
A mixture of acetone and isopropanol containing 50 mol% acetone is to be distilled continuously to produce an overhead product containing 80 mol% acetone and a bottoms containing 25 mol% acetone. If a saturated-liquid feed is employed, if the colu..
What are some of the obvious and less obvious ethical issues involved in product recalls? How might these ethical issues come into conflict with a particular company's economic concerns?
Steam in a closed system is compressed by reversible isothermal process in a heat bath at 250 °C, starting from an initial pressure of 15 bar. During the process, the steam receives 400 kJ/kg of work. Determine the final state and the amount of he..
50. Methanol is synthesized from carbon monoxide and hydrogen in a catalytic reactor. The fresh feed to the process contains 32.0 mole% CO, 64.0% H2, and 4.0% N2. This stream is mixed with a recycle stream in a ratio S mol recycle/1 mol fresh feed to..
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