In a Y-connected ac generator, each phase voltage has a magnitude of 135 VRMS, then the magnitude of each line voltage is: Select one: O a. 270 Ob. 233.8 OC. 190.8 O d. 135
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- H* 3G zain IQ Asiacell The generator convert from PV to PQ if the active power of the generator exceed the * maxinum and minimum limits between the maximum and mimium limit equal to the load power Non of them With base voltage of 450 kV. The actual voltage of the generator is 560 kV. The magnitude voltage in the parameter of the PV generator in the nepaln software is * O 1.2444 pu O 450 kV O 124.44 % O 0.8036 pu 80.36 % Non of themIf in a Y- connected ac generator, each phase voltage has a magnitude of 90 Vrms, what is the magnitude of each line voltage Select one: O a. 180 Vrms O b. None of these O c. 155.88 Vrms O d. 90 Vrms JimIf a Load absorbs 10 kVA at a leading power factor of 0.6. Then the complex power is: Select one: a. -6000 - j8000 VA b. 6000 + j8000 VÀ c. 6000 - j8000 VÀ d. None of these
- 244. The apparent power drawn by an a.c. circuit is 20 kVA and reactive power is 12 kVA. The real power in the circuit in kW will beA single phase AC generator winding has an effective resistance of 0.2 ohm and synchronous reactance of 2.2 ohms. Find the generated emf when the load is 50A at a terminal voltage of 500 V at pf 0.8 leading.When a resistor is connected across the terminals of an ac generator (117 V) that has a fixed frequency, there is a current of 0.332 A in the resistor. When an inductor is connected across the terminals of the same generator, there is a current of 0.365 A in the inductor. When both the resistor and the inductor are connected in series between the terminals of this generator, what is (a) the impedance of the series combination and (b) the phase angle between the current and the voltage of the generator? Note: The ac current and voltage are rms values and power is an average value unless indicated otherwise. (a) Number (b) Number Buda i Vrms R Irms.R Circuit 1 Units Units Vrms. Irms, L Circuit 2 > L Vrms R www Circuit 3
- 2. A voltage applied to a load is V=208420°V and current through load is I=10 &-10° A. Find the following [SO 1] o complex power consumed by load • Is the load inductive or capacitive? o the power factor of the load o the reactive power consumed or generated by the load. o Does the load consume or supply reactive power? 3. A single phase motor draws 20 kVA at 0.70 lagging power factor from a 120 V source. The PUD desires to improve the power factor to 0.9 lagging by connecting a shunt capacitor bank across the terminals of the motor. Determine the size of the capacitor bank in VARS. Calculate the following: [SO 1] a) What are the initial load current, real and reactive powers of the load? b) What are the real and reactive power after adding the capacitor bank? c) What is the kVAr rating of the capacitor bank? (3) d) What is the load current? di) How is the load current affected by the load reactive power?The reactive power output of an alternator is limited by load angle True FalseIf the load is connected to the generator thgrough an inductive line and the voltage at the load side is the same as the voltage at the terminals of the generator, which of the following must be true? O A. The reactive power is flowing from the generator to the load and from load to the generator at the same time. O B. The load is disconnected, and no power is delivered to the load. O C. The load has a poor power factor and it's absorbing too much reactive power. O D. None of the other choices are correct O E. The generator is unable to produce reactive power; therefore, the reactive power is flowing from the load to the generator.
- Two three-phase alternators operate in parallel and the excitation is such that theinduced emfs are 1 kV/ph. The load admittance is (0,427 – j0,214) S. Theadmittance/phase of the machines are (0,0262 – j0,499) S and (0,0218 – j0,312) Srespectively. The emf of B leads A by 10°e. Calculate:(a) the terminal voltage(b) the current supplied by A(c) the power factor of BThe e.m.f. 's from four generators are e = 4 7sin@t e = 2 cos ot, e =/7 cos(@t + 90° ) and 1 3 = 5/2 sin(ot – 90° ). The alternators are connected in series. e4 18. Find the rms value of the resultant e.m.f A 5.0 В 4.0 C 2.5 D None of the above. 19. If the resultant e mf is expressed in the form e = Asin(ot + B). Find Bin degrees. A 53.1 в 369 С -53.1 D -36.9A generator having emf 7sint Volts is connected in series with 8 Ohm resistor and an inductor of 2 Henrys. Find b) the current, I after 15 minutes.