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A 10-hp, 230-V shunt-wound motor has a rated speed of 1,000 r/min and full-load efficiency of 86 percent. Armature-circuit resistance is 0.26 Q; field-circuit resistance is 225 Q. If this motor is operating under rated load and the field flux is very quickly reduced to 50 percent of its normal value, what will be the effect upon counter emf, armature current, and torque? What effect will this change have upon the operation of the motor, and what will be its speed when stable operating conditions have been regained?
A pressure guage reads in tuscaloosa alababama 16 psi. can this pressure be a vacuumed pressure? Why or why not? if you think it can convert it to absolute pressure. If you think it cannot assume that it is a gauge pressure and convert to absolute pr..
a surface is maintained at 150oc and is enclosed by a very large surrounding surface at 80oc. what is the net radiant
James Dyson is the designer of one of the best selling types of vacuum cleaner. Find out how the design was triggered, the design methods he used and why the design was considered to be innovative.
a fixed amount of water vapor initially at 20mpa 520c is cooled at constant volume until its temperature reaches
A 4 pole, 9 coil, simplex wave wound machine with 20 turns per coil is rotating in a field of 3T, and pole area of 100cm2. Find the maximum torque generated from a 100V source, and an armature resistance of 1 ?. Find the current, if the machine has b..
Consider a 70-kg woman who has a total foot imprint area of 400 cm2. She wishes to walk on the snow, but the snow cannot withstand pressures greater than 0.5 kPa. Determine the minimum size of the snow shoes needed.
consider an ideal vapor-compression refrigeration cycle. the refrigerator employs refrigerant 134a as the working fluid
a mini motor bike for chidren is powered by a 4 hp single cylinder gasoline engine governed to run at a maximum of 2250
two reversible refrigeration cycles operate in series. the first cycle receives energy by heat transfer from a cold
draw a complete schematic diagram show arrows symbols amp numeric values for each w amp amp q amp . consider the steady
1. Develop and draw the MDOF system for the vertical vibrations of the un-damped three dimensional model of a typical three-wheeled solar or energy efficient car (include wheels, car body, driver, minimum 7 DOF).
certain microalloyed steels contain small additions of vanadium or niobium that permit the grain size to be reduced to
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