A 5 kW 125 V shunt generator operates at 1800 r/min If the field current is 1.8 A and the armature resistance is 0.5 Q find the generated voltage.
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- A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)A 230V, 50Hz single phase motor takes 70A and operates at a power factor 0.75 lagging. If a capacitor of 160uF is connected in parallel with the motor. Find the new current and new power factor.A shunt generator with a capacity of 200 kW and a voltage of 220 V has a shunt field resistance of 50 and constant losses of 1500 watts. Calculate the half load efficiency if the full load efficiency is 88 percent.
- 21 In a DC generator, if the core loss constant and the copper loss is increasing, then the efficiency will be maximum. Select one: True FalseA 30kW series generator has an efficiency of 88% when operating at rated load. If the stray power loss is 15%of the full load losses, calculate the maximum efficiency of the generator. Assume that the stray power loss isconstant and the other losses vary as the square of the load,The ohmmeter registers the value of the resistances as follows: Ra= 0.02 ohms; Rf= 80 ohms; Rse=0.03 ohms. The emf induced by the generator is 510 V while the terminal voltage is 500 V. Determine the load current delivered assuming that the generator is a short shunt compound generator.
- A 25cps single-phase, 8-pole, alternator with 725 mWb flux per pole has 288 slots. The machine coil has 2 turns per coil. In the winding of the armature, the ratio between the chording angle to the fractional pitch is 1/8. Find the voltage between two terminals.Since the generated power at 4% slip in a 3-phase induction motor is 15 kW, which of the following is the rotor copper loss? a.600 Wattb.700 Wattc.675 Wattd.625 Watte.650 WattAn 8-pole lap-wound d.c. generator has 120 slots having 4 conductors perslot. If each conductor can carry 250 A and if flux/pole is 0.05 Wb,calculate the speed of the generator for giving 240 V on open circuit. Ifthe voltage drops to 220 V on full load, find the rated output of themachine.
- A 25-kW shunt generator is delivering full output to 400-V bus-bars and is driven at 950 r.p.m. by beltdrive. The belt breaks suddenly but the machine continues to run as a motor taking 25 kW from the busbars.A 25kW series generator has an efficiency of 85% when operating at ratedload. If the stray power loss is 20% of the full load loss, calculate theefficiency of the generator when it is delivering a load of 15kW.c) Compute the no load line voltage of a star connected 4-pole alternator for the following data:• Flux per pole = 0.12 weber• Slots per pole per phase =4• Conductors/slot = 4• Two layer winding, with coil span = 1500