Hinal Exam Machine II Exercise 1. A 460-V, 25-hp, 60 Hz, four-pole, Y-connected induction motor has the following imp pe

[answerhappygod]

Hinal Exam Machine Ii Exercise 1 A 460 V 25 Hp 60 Hz Four Pole Y Connected Induction Motor Has The Following Imp Pe 1 (61.45 KiB) Viewed 49 times

Hinal Exam Machine II Exercise 1. A 460-V, 25-hp, 60 Hz, four-pole, Y-connected induction motor has the following imp per phase referred to the stator circuit: R₁=0.64152 R 0.3322 X 1.106 X-0.464 02 X= 26.32 The total rotational losses are 1100 W and are assumed to be constant. The core loss is with the rotational losses. For a rotor slip of 2.2 percent at the rated voltage and rated the motor's 1. Speed. 2. Stator current, 3. Power factor, 4. Pomy and Pot 5. Torques nd and food, 6. Efficiency Exercise Il A 2300-V 1000-KVA 0.8-PF-lagging 60-Hz two-pole Y-connected synchronous generatio synchronous reactance of 1.1 Q2 and an armature resistance of 0.15 2. At 60 Hz. its friction and losses are 24 KW, and its core losses are 18 kW. Assume that the field current of the generator is adjusted to achieve rated voltage per phas Ve=1328V at full load conditions in each of the questions below. 1/ Calculate the current la. note that Vo vector phase is considered as the origin of the phase. 2/ Gives the internal voltage in the machine E 3/ Gives the output power of the machine. 4/ Gives the copper losses in the machine. 5/ Gives the input power of the machine and deduce the generator efficiency. 6/ Gives the voltage regulation of the generator. 7/ Gives the voltage regulation of the generator if it is loaded to rated KilovoltAmperes wit leading loads. 8/ Gives the voltage regulation of the generator if it is loaded to rated KilovoltAmperes wit loads Exercise III. 4000 volts 50Hz, 4 pole star connected synchronous motor generates a back emf /phas 800 volts. The resistance and synchronous reactance per phase are 2.2 2 and 22 2 resp me torque angle is 30° electrical. Calculate (i) resultant stator voltage/phase (ii) stator cu ) power factor (iv) gross torque developed by the motor. ercise IV. hree-phase 100HP, 460V, 60 Hz, eight poles star connected induction motor has the f ameters per phase (R1-0.076 Q, R'2=0.0637 0, X1-X2-0.195 0, Xm-6.386 0). The e =tance Rc is neglected. motor runs at 873 rpm. rmine the 1/ input current, the 2/input power, 3/air gap power, 4/rotor copper l eloped mechanical power, 6/output power and 7/efficiency of the motor.