- An eleAical motor īs modelled as 5117j ohm. Then a 300pF capacitor is conneeted în parallel. If the voltage goplied 3 230 V, 50 H2, calculate: a) Total current b) Active power, reactive power, apparent power Power factor of the motor
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- Induction motors and welding transformers require magnetizing current, which causes a. lagging power factor. b. leading power factor. c. unity power factor. d. zero power factor.A generating voltmeter is required to measure voltage between 15kV and 250kV. If the indicating meter reads a minimum current of 2uA and maximum of 35uA. Assume that the speed of driving synchronous motor is 1500rpm. Determine the capacitance of the generating voltmeter. A. 1,2 pF B. 6.5 pF C. 15,2pF D. 1 pF4. An induction motor draws 4.5 A at a 0.75 lagging power factor from a 208V, 60 Hz source. a) What value of capacitance must be connected in parallel with the motor to raise the overall p.f. to 1. b) Calculate the magnitudes of the motor current, capacitor current and source current with the capacitor in place. 5. A 3-phase Y-connected motor is connected to a three phase Y-conected source with 440V line voltage. It draws a line current of 5A from the source. If the power factor of the motor is 0.8, calculate a) Active power and Reactive power absorbed by the load b) Total Apparent power
- V1 = 170 V f1 = 100 Hz 1) A single-phase load has an active power of P = 2 kW at V1 V @f1Hz and the power factor is cosφ = 0.75. This motor iscompensated to cosφ = 0.85 using a parallel capacitor Find the reactive power difference between compensated and uncompensated status (which will give the capacitor power) and calculate XC and C using the power difference value?A three phase 250 hp induction motor operates at 0.8 lagging power factor on 440 V, 50 Hz supply. The full load efficiency of motor is 70 %. It is required to improve the power factor to 0.95 lagging by using the capacitor bank connected in delta. Find current through capacitor.In a workshop, there is a three-phase asynchronous motor with a power of 6 HP, an efficiency of 85%, and a power factor of 0.8. Find the capacitor capacity required for power factor correction in the workshop. (The capacitors will be connected in a delta configuration.) A new power factor of 0.95 is desired. The nominal voltage in the workshop is given as 0.4 kV. (1 HP = 0.745 kW)
- Q3 A three-phase induction motor has the following data: 50 hp and V440 and 50HZ operating at full load with an efficiency of 89% and a power factor of0.85 lagging. Calculate the total apparent power of the capacitors to raise the power factor at full load to 0.95 lagging. What is the value of the capacitors' capacitance for each phase if we connect the capacitors (a) in the form of delta (b) in the form of a star.6. Analyzing an AC power outlet: a. Identify the common names for measurements 1, 2, 3, and 4 for this voltage trace. In a country using 220 VAC as standard, what is the peak-to-peak voltage? b. C. A single-phase induction motor draws 4 Amps rms when operating in the country above. What is the apparent power usage? Please note the units. û 0 -û- 3 1 V 4V1 = 180 V f1 = 80 Hz 1) A single-phase load has an active power of P = 2 kW at V1 V @f1Hz and the power factor is coso = 0.75. This motor is compensated to coso = 0.85 using a parallel capacitor (the load is modelled as series RL). Determine: d. Reactive power and apparent power after compensation е. Find the reactive power difference between compensated and uncompensated status (which will give the capacitor power) and calculate Xc and C using the power difference value
- Assume that a three-phase 700KW, 50 Hz, 4200V (Line to Line) Wye-connected induction motor has a full-load efficiency (n) of 100% and a lagging power factor of 0.75 and is connected to a feeder. If it is desired to correct the power factor of the load to a lagging power factor of 0.9 by connecting three capacitors (capacitor bank) at the load as shown in the figure a VLL b VLL IL Motor PF KW Lagging CAPACITOR BANK If QC is rating of the capacitor bank in KVAR that should be connected in parallel with motor and if C is the capacitance of each unit if the capacitors are connected in delta, in microfarads Taking two digits after comma, then QC and C will be Select one: O a. QC = 475.12 KVAR &C = 12.63 Microfarad O b. QC = 675.12 KVAR &C = 42.63 Microfarad O. QC = 775.12 KVAR & C = 42.63 Microfarad Od. QC = 575.12 KVAR &C = 32.63 Microfarad O e. QC = 375.12 KVAR & C = 22.63 Microfarad Of. None of theseA highly inductive load draws 10kW at 0.75 lagging power factor, connected in parallel to this load is a synchronous motor being operated at 0.9 leading power factor. Solve the minimum size in kW of the synchronous motor that will make the combined load have a lagging power factor of 0.8. (Answer in 2 decimal places)H. W.: A 35 kW induction motor has power factor 0.9 and effliciency 0.9 at full-load, power factor 0.6 and efficiency 0.7 at half full-load. At no load the current is 25% of full-load current and power factor is 0.I. Capacitors are supplied to make the line power factor 0.8 at half full- load. With these capacitors in circuit, find the line power factor at: (i) full load, and (ii) no load.