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The d.c. beta rises with collector current due to the SNS effect and drops due to high injection level in the best. Combine these two effects and obtain the condition at which the beta peaks. Use the simplest formulas derived in the text for these two effects. Find the current density and current of peak beta using the numerical values of the parameters given in this section.
Neglecting system friction and air drag, estimate the power required to drive this belt.
A cube of linear elastic material is subjected to a vertical compressive stress sigma1 in the 1-direction, but it is now constrained ( e = 0) in both the 2- and 3- directions. Find expressions for the induced transverse stresses, sigma2 and sigma3 in..
The drive shaft to a boat's propeller is 50 mm in diameter. If a 25 mm diameter hole is bored along its length calculate the percentage saving in weight and the percentage reduction in torsional streng
at the beginning of the compression stage in an air-standard diesel cycle the conditions are p 200 kpa and t 380k. the
determine the concentration of a non-reactive tracer that was released as a pulse input if the flow in is 1.5 cms and
A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70,000 kJ/h to maintain a building at 208C on a day when the outside temperature is 258C. If electricity costs 8.5 cents per kW ? h, (a) determine the actua..
air at 5 bar and 177degc state 1 is expanded through a turbine to 1 bar and 27degc state 2. the mass flow rate of air
A fan that can provide air speeds up to 50 m/s is to be used in a low-speed wind tunnel with atmospheric air at 25°C. If one wishes to use the wind tunnel to study flat-plate boundary layer behaviour up to Reynolds numbers of Rex = 10^8 , what is the..
Calculate the change in frequency, velocity amplitude, and acceleration amplitude if the maximum deflection remains 10 cm.
When immersed in a uniform stream, a thick elliptical cylinder creates a broad downstream wake, as idealized in Fig. P3.72.
consider the non lifting flow over a circular cylinder. calculate the location on th surfaceof the cylinder where the
an insulation system is to be selected for a furnace wall at l000degc using first a layer of mineral wool blocks
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