The shaft of a three-phase synchronous generator is rotating at 1500 RPM synchronous speed. This generator is supplying a load of 15.2 KW, 0.8 PF lagging, with an efficiency of 83.5 %. The copper losses are neglected. Calculate the sum Praw + Pcore +Patray Answer: The sum Praw +Poore + Patray is: KW.
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- The shaft of a three-phase synchronous generator is rotating at 1500 RPM synchronous speed. This generator is supplying a load of 15.2 KW, 0.8 PF lagging, with an efficiency of 83.5 %. The copper losses are neglected. Calculate the sum PF&w + Pcore + Pstray , and the induced torque by this generator. Select one: O a. PF&w + Pcore + Pstray = 3003.6 W, and Tind = 92.3 N.m. O b. PF&w + Pcore + Pstrav = 3597 W, and tind = 104.9 N.m. O c. PEgw + Pcore + Pstray = 2508 W, and tind = 104.9 N.m. O d. PF&w + Pcore + Pstray = 2508 W, and tind = 92.3 N.m. O e. NoneThe shaft of a three-phase synchronous generator is rotating at 1500 RPM synchronous speed. This generator is supplying a load of 16.5 KW, 0.8 PF lagging, with an efficiency of 88 %. The copper losses are neglected. Calculate the sum Praw + Pcore + Pstray, and the induced torque by this generator. Select one: O a. PF&w + Pcore + Pstray = 1980 W, and tind = 119.2 N.m. O b. PFaw + Pcore + Pstray = 1980 w, and tind = 105 N.m. O c. None d. PF&w + Pcore + Pstray = 2250 W, and tind = 105 N.m. %3D O e. PF&w + Pcore + Pstray = 2557 W, and tind = 119.2 N.m.The shaft of a three-phase synchronous generator is rotating at 1800 RPM synchronous speed. This generator is supplying a load of 16.5 KW, 0.8 PF lagging, with an efficiency of 85 %. The copper losses are neglected. Calculate the sum Pf&w + Pcore + Pstray , and the induced torque by this generator. Select one: O a. None O b. PF&w + Pcore + Pstray = 2475 W, and tind = 87.5 N.m. c. PE&w + Pcore + Pstray = 2911.7 W, and tind = 87.5 N.m. O d. Pf&w + Pcore + Pstray = 2475 W, and tind = 102.9 N.m. O e. Pfgw + Pcore + Pstray = 3425.5 W, and tind = 102.9 N.m. Clear my choice
- If 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.An alternator is at lagging power factor when it is normally excited O True O FalseA 6 pole DC wave wound generator has 26 armature conductors with flux per pole is 21 mWb and the e.m.f generated is 63 V, then the speed of the machine is O 6.55 rps O 0.66 rps O 38.46 rps O 115.38 rps The Auto transformers are used to provide a variable voltage output Select one: O True O MEEZ11ON-Electrical O False
- Two 800kW alternators A and B operating in parallel. The speed regulation of A is 100% to 103% from full load to no-load and that of B is 100% to 104%. Determine the kW share of A if the total load is 1200kW.A shunt generator has a no load terminal voltage of 270V and a voltage of 240V when it delivers 180A. Determine the voltage when the load current is 120AInstantaneous power output of a 3-phase 60 Hz generator will not be constant under following condition: O A. The load is unbalanced. O B. The load draws both real and reactive power. O C. The load draws only reactive power. D. None of the other choices O E. The load draws only real power.
- A synchronous generator is generating 330 V at 60 Hz at a field current of 3A. The e.m.f generated when the frequency is 35HZ and the field current is 2.9A is Harmonics generated in a machine due to the change in the reluctance of air gap is Answer: Ir mothod is called pessimistic method as the requlation calculated is always more than the actual result.When a generator fails, its power output is lost, and the result is an imbalance between total load plus losses and total generation. Thus the frequency will: Select one: a. Remain the same b. None of these O c. Increase O d. DropIn a synchronous generator * the OC voltage leads the terminal voltage by an angle known as power factor angle the OC voltage lags the terminal voltage by an angle known as power factor angle the OC voltage leads the terminal voltage by an angle known as power angle the open-circuit voltage (OC) lags the terminal voltage by an angle known as power angle