Athree-phase, four-pole winding is installed in 12 slots on a stator. there are 40 turns of wire in each slot of the windings. all coils in each phase are connected in series, and the three phases are connected in delta. the flux per pole in the machine is 0.060 wb, and the speed of rotation of the magnetic field is 1800 r/min.
a. what is the frequency of the voltage produced in this winding?
b. what are the resulting phase and terminal voltages of this stator?

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false