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Why is it difficult to keep nano-scale features at high temperature?
The intrinsic strength of a material is of the order of ~E/15 (E = Young's modulus). What are the common causes for this level never being attained in bulk materials? In metals? In ceramics? How can this be improved at small sizes?
Why are fibreglass composites stronger and tougher than bulk glass?
Using an average value of 2.4 for the volatility of benzene relative to toluene, calculate the number of theoretical plates required at total reflux. Also calculate the minimum reflux ratio, if the feed is liquid and at its boiling point.
Plot the system curve on the pump characteristic given in Figure 20.17 and determine the operating point and pump efficiency. Properties of the fluid: density 900 kg/m3, viscosity 1.36 mN m-2 s.
Neglecting stator resistance and rotational and stray-load losses, and assuming constant rotor resistance, calculate the starting torque and the maximum torque in per-unit of full-load torque, as well as the slip at which the maximum torque occurs..
If the slip-ring voltage is 400 V, when the rotor frequency is 120 Hz, at what speed must the rotor be driven in order to give 150 Hz at the slip-ring terminals? What will the slip ring voltage be in this case?
A 100-kW, 250-V shunt generator has an armature-circuit resistance of 0.05 Ω and a field circuit resistance of 60 Ω. With the generator operating at rated voltage,
Your company has two mixed reactors of unequal size for producing a specified product formed by homogeneous first order reaction. How these reactors should be connected to achieve a maximum production rate.
Calculate the wavelength, in meters of a photon capable of exciting an electron in He+ from the ground state to n = 4
Calculate the new rotor current frequency.
A pressure drop of 0.8 bar is permissible on both streams. Allowance should be made for fouling by including a fouling factor of 0.0003 (W/m2 °C)-1 on the crude stream and 0.0002 (W/m2 °C)-1 on the kerosene stream.
A gas stream contains 18.0mole% hexane and the remainder nitrogen, the stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied.
Explain in detail the working of the instrument. Description should include neat diagram, principle of working and the source of literature.
A toroid with a circular cross section is shown in Figure P11.2.3. It is made from cast steel with a relative permeability of 2500. The magnetic flux density in the core is 1.25 T measured at the mean diameter of the toroid.
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