A3-phase, y-connected 460-v (line-to-line), 20-kw, 60-hz, 6-pole induction motor has the following parameter values in ω/phase referred to the stator:
r1 = 0.271 ω; x1 = 1.12 ω; xm = 23.10 ω; r2 ‘ = 0.188 ω; x2 ‘ = 1.91 ω.
the total friction, windage, and core losses may be assumed to be constant at 320 w, independent of load. the slip s = 1.6 percent (s = 0.016).
(a) draw the single-phase equivalent circuit.
(b) determine the stator current i1.
(c) determine the output power pout.
(d) determine the output torque tout

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

The higher the astm grain size number, the finer the gran is. a)-true b)-false