C1 (i). The output of the 3-phase, 415 V induction motor is 16 HP and operates at power factor of 0.65 lagging with an efficiency of 83 %. Calculate the reading on each of the two wattmeter connected to measure the input. The value of P, is The value of P2 is C1 (i). Three Identical capacitors are connected in delta to 435 Volts, F = 50 Hz, 3 phase supply. If the line current is 12 A. Calculate its reactance and capacitance value. [3 Reactance Xc is The capacitance of each capacitor, C

C1 (i). The output of the 3-phase, 415 V induction motor is 16 HP and operates at power factor of 0.65 lagging with an efficiency of 83 %. Calculate the reading on each of the two wattmeter connected to measure the input. The value of P, is The value of P2 is C1 (i). Three Identical capacitors are connected in delta to 435 Volts, F = 50 Hz, 3 phase supply. If the line current is 12 A. Calculate its reactance and capacitance value. [3 Reactance Xc is The capacitance of each capacitor, C

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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4. A three-phase, 7.5Hp, 230V, 60Hz, Delta connected induction motor was tested and give the following input data:No load Test: I = 10A P = 650W slip = 0.8333%Load Test: I = 19A, P = 6800W slip = 3%Resistance test between two stator terminals: Vdc = 9V , Idc = 20A Assume K = 1.5Determine the efficiency of the motor during the load test
What will be the operating power factor of a 3-phase induction motor, whose ratings are 230 V, 50 Hz, 120 hp, and 4-poles? Motor is operating at rated conditions with an efficiency of 92% and draws a line current of 260 A. The core loss and stator copper losses are 1710 W and 2830 W respectively. (a) 0.85 (c) 0.93 (b) 0.90 (d) 0.80
4. A 2 MVA, 2.3kV, three-phase Wye connected alternator operates at rated kVA at a power factor of 80 %. The dc armature winding resistance between terminals is 0.08-ohm. The field takes 70-A at 125-V from the exciter equipment. Friction and windage loss is 20-kW, iron loss 36-kW and stray power loss are 2.0-kW. Calculate the efficiency of the alternator. Assume the effective armature winding resistance is 120% of the dc resistance.
A 10-HP, 110-V, 3-phase, Y-connected, 60 Hz, 4 pole inductionmotor has the following test data: No load: 110 V, 21 A, 650 WBlocked-rotor: 24 V, 51 A, 1040 WStator resistance between terminals: 0.08 ohmThe motor has wound rotor. Assume that both stator and rotor windings arewye-connected. a) If full voltage were applied to the stator with therotor terminals short-circuited, how much starting current would themotor draw? b) If the ratio of transformation per phase of the motor is2, with the rotor having the greater turns, how much resistance should beadded to each phase of the rotor to limit the starting current of themotor to 75 A, when the voltage is applied to the stator?
Three phase, star connected, 480 V (line), 22 Kw, 60 Hz, 4 pole asynchronous motor has the following parameters. Rs=0.24 Ohm R’r=0.20 Ohm Xs=1.3 Ohm X’r=1.2 Ohm Xm=37 Ohm Total wind, friction and core losses are fixed and are 1300 W. Find the output power, generated power, efficiency and input power factor if the slip is 1% and 2% when the motor is directly connected to a 480 V source?
Determine the efficiency of a 1500kVA, 2300 V, 3 phase, Y-connected alternator, which operatesat rated output with a power factor of 80%. The DC armature resistance at 70°C betweenterminals is 0.08 ohm. The field takes 70 A at 120 V from the exciter equipment. Friction andwindage losses are 15kW, iron loss is 35kW and stray load losses is 1.5kW. Assume the effectivearmature winding resistance is 1.5 times the DC value.
The output of the 3-phase, 425 V induction motor is 15 kW and operates at power factor of 0.8 lagging with an efficiency of 80 %. Calculate the reading on each of the two wattmeter connected to measure the input. The value of P1 is? The value of P2 is?
A 400 V, 4 pole, 50 Hz, three-phase star connected induction motor has the following impedances per phase as referred to the stator: R1= 0.6 Ω, X1= 1.1 Ω, Xm=25 Ω, R2’= 0.3 Ω, X2’=0.5 Ω The mechanical losses are 1000 W and stator core losses are 500 W. The slip is 3%. Determine, Speed of the motor Stator current and power factor Mechanical power developed Output power Efficiency of the motor
A 6-hp; 60-Hz; 120 volts; 8 poles; three-phase induction motor was tested and the following data were obtained: No - Load Test: Vnl = 120 volts; Pnl = 380 watts ; Inl = 12 amperes Load Test: Vl = 120 volts; I load = 30 amperes; Pl = 4950 watts; rotor speed = 810 rpm The DC stator resistance = 0.25 ohm ; Assume it to be wye connected and the effective AC value equal to 1.25 the DC value. Calculate: a) The horsepower output developed by the motor based on the load test; b) The efficiency and c) the power factor
150 hp, 1760 d/d, 2,3 kV, 60 Hz, Asynchronous motor with 3 phase winding rotor, one running the conveyor belt.The rotor windings of the machine are connected in star and The nominal open circuit voltage between collector rings is 530 V. What is requested below calculate. a) Rotor winding resistance per phase b) Assuming that the line voltage is 2.4 kV, the motor delivers 40 hp at 600 rpm. the resistance value that must be placed in series (per phase) of the rotor windings for
H.W.2: A Three-phase, 600 V, 50 Hz, Delta Connected SCIM, The motor draws no-load Current of (8A) with no load observed power of (1100). At fell loading Condition the motor draws (20A) at (0.8) power factor and (0.04) Slip. if the Armature resistance is (0.4 sulph) and the rotational losses (240 w), Determine; Iron loss Output Power Efficiency
A three-phase Y-connected 230-V (line-to-line) 7.5-kW 60-Hz six-pole induction motor has the following parameter values in Ω/phase referred to the stator: R1 = 0.294, R2 = 0.144 X1 = 0.503, X2 = 0.209, Xm = 13.25 The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 4 percent, determine: (a) stator current, power factor, (b) output torque and power,(c) efficiency when the motor is operated at rated voltage and frequency, (d) the load component 12 of the stator current, the induced torque Tind, and the converted power Pconv for a slip s= 0.04,(e) the maximum torque and the corresponding speed; and (f) the starting torque Tst and the corresponding stator load current 12 start