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1. A 240-V series motor has an armature resistance of 0.42 Q and a series-field resistance of 0.18 Q. If the speed is 500 r/min when the current is 36 A, what will be the motor speed when the load reduces the line current to 21 A? (Assume a 3-V brush drop and that the flux is proportional to the current.)
2. A 220-V DC shunt motor has an armature resistance of 0.2 Q and a rated armature current of 50 A. Find a. The voltage generated in the armature. b. The power developed.
3. A 550-V series motor takes 112 A and operates at 820 r/min when the load is 75 hp. If the effective Ra = 0.1 Q Rf = 100 Q When running at 1,100 r/min with no load connected to the shaft, the motor draws 4 A from the line. Find E and the rotational losses at 1,100 r/min (assuming that the stray-load losses can be neglected).
Evaluate the coef?cient of thermal expansion, α, for rubber under an extension of 100% at 20?C. A rubber band was stretched from 6 to 12 ins. While being held under a constant stress, it was heated from 20?C to 40?C.
in moving from point b in a particular circuit to point a an electron gains 4 aj of potential energy. what is the
a scuba divers 2 cubic foot air tank is to be filled with air from a compressed air line at 120 psia and 100 degrees f.
Determine the work input and entropy generation during the compression of steam from 100 kPa to 5 MPa in (a) an adiabatic pump and (b) an adiabatic compressor is the inlet state is saturated liquid in the pump and saturated vapor in the compressor an..
an exhaust fan in a building should be able to move 5 lbms air at 14.4 psia 68 f through a 1.25 ft diameter vent hole.
A total condenser is to be designed for condensing saturated 2-butanol vapor to form saturated 2-butanol liquid at 1 atm at the rate of 0.72 kmol/h. The saturation temperature of 2-butanol vapor at 1 atm is 99.6C. Cooling water at 25C and 1 atm is av..
a thin circular cylindrical shell subjected to internal pressure p isnbspsimultaneously compressed by an axial load p
Water vapour enters an adiabatic turbine at a flow rate of 820 L/s. The turbine expands the water from 10 MPa and 600oC to 8 kPa and a quality of 0.9. Kinetic energy and potential energy effects can be ignored.
Determine the force P required to force the 10° wedge under the 90-kg uniform crate which rests against the small stop at A. The coefficient of friction for all surfaces is 0.40.
which of the following butt-weld preparations is usually the most susceptible to lack of sidewall fusion during the
two streams discharge into a pipe as shown. the flows are incompressible. the volume flow rate of stream a into the
an open gas turbine is equipped with a regenerator. the compressor is 87nbspefficient with air entering the compressor
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