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:
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Q: The winding data for three different alternators are as follows I. 60 slots, four poles, span 1 to 9…
A: pitch factor=cos(short pitch angle2). slot angle=180slot /pole.
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Q: A tree-phase generator has a load 100 kw per phase at a power factor 80 percent,lagging what is the…
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Q: A long shunt d.c. compound generator delivers 110 kW at 220 V. If r = 0.01 ohm, r = 0.002 ohm, and…
A: We have been given an long shunt dc compound generator as shown in figure. Given data, Voltage (V)…
Q: A 3 Phase, 11 kV, 5 MVA alternator has synchronous reactance of 10 2 per phase. Its excitation is…
A: V=11kv output = 5MVA Xs=10 E=14kv V/ph=11k3=6352 V E/ph=14k3=8083 V
Q: Two alternators are operating in parallel and sharing a common load. For increasing the load shared…
A: The explanation is as follows.
Q: A three phase 500 MVA, 22 kV generator has winding reactance of 1.065 Ω. Find its per-unit…
A: Given,For a generator,MVA = 500kV=22Winding reactance = 1.065Ω
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Q: Three phase alternators are invariably connected in star so as to a. Reduce the size of stator…
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Q: The regulation of an alternator is likely to be negative in case of resistive load O True O False
A: Regulation of alternator at any load is Voltage regulation = Rpucos(∅)±Xpu sin(∅) + for lagging…
Q: As the leading pf of the load of an alternator decreases, the magnitude of generated voltage…
A: As the leading power factor of the load of an alternator decreases, the magnitude of generated…
Q: The short circuit characteristic of an alternator is always non- linear O True O False
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Q: A single phase alternator has a rated output of 500 KVA at a terminal voltage of 3300 V. The stator…
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Q: T or F, modify the wrong part if False, please underline twice your answer if True or False.…
A: The solution is given below
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Q: A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2…
A: Rating of the generator = 645 MVA Terminal voltage = 24 kV Power factor of the load = cos φ = 0.9…
Q: Instantaneous power output of a 3-phase 60 Hz generator will not be constant under following…
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Q: The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9…
A: We will find the pitch factor in each case as shown below.
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A: In this answer let us try to find the base power used in order to get the given per unit impedance…
Q: 1-A 500 18 kV. power factor=0.8, 50 Hz, 3 phase, 2 pole synchronous generator has the following…
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Q: A 30kW series generator has an efficiency of 88% when operating at rated load. If the stray power…
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Q: A three phase synchronous generator is rated at 9 kW, 240 V working at unity power factor. The power…
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Q: If a Load absorbs 20 kVA at a lagging power factor of 0.6. Then the complex power is:
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Q: A three phase synchronous generator is rated at 8 kW, 240 V working at unity power factor. The power…
A: The power factor angle is 0⁰. The explanation is provided below.
Q: 58. A shunt generator running at 1000 rpm has generated emf of 200 V. if the speed increases to 1200…
A: Given E1=220 VN1=1000 N2=1200
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Q: An alternator is at lagging power factor when it is normally excited O True False
A:
Q: A 110 MVA, 13.8 kV, three phase alternator will have a per phase nominal impedance of
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Q: The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9…
A: pitch factor can be calculated using the following relation Pitch factor = cos(alpha) / 2
Q: empting question 1 out of 12 For the same alternator, the ratio of rated KVA, when connected as…
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A: In the power plant, Which location of the turbine connect to?
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Q: A three-phase synchronous generator is rotating at 1000 RPM synchronous speed. The output power of…
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Q: The winding data for three different alternators are as follows 1. 36 slots, four poles, span 1 to 5…
A: pitch factor of the alternator can be calculated using the following equation cos alpha / 2
Q: An alternator is generating power at 210 V per phase while running at 1600 rpm. If the speed of the…
A: Given, N1=1600 rpmN2=1200 rpmV1=210V
Q: 14. In AC circuits, voltage and current are always in same phase. (a) True (b) False
A: IN AC circuit, voltage and current are always
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Q: A four-pole, three phase, 50Hz, star connected AC generator has 24 stator slots. There are 6…
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Q: An alternator is generating power at 210 V per phase while running at 1600 rpm. If the speed of the…
A: To find the generated voltage per phase at 1200 rpm
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A: In this question we will write component used for connecting generating station to feeders..
Q: As the leading pf of the load of an alternator decreases, the magnitude of generated voltage…
A: The v-curve of synchronous generator is shown below:
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Q: 7. An inductive load is shared by two identical synchronous generators A and B equally, if the…
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- The total instantaneous power delivered by a three-phase generator under balanced operating conditions is (a) A function of time (b) A constantA 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 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,
- If the current and voltage are 90 degrees out of phase, the power factor will be? a) 0 b) Infinity c) 1 d) Insufficient information providedA generator has no-load frequency of 61.2 Hz. Its speed load curve has a slope of 1 Hz/1000kW. When load 1 of 1200 kW is being supplied by it, ad additional load 2 of 900 kW is switched on. Find the frequency in Hz before and after adding Load 2.Give the formula for finding the voltage regulation of a generator. a) % reg = {[(no-load) - (full-load)] = (no-load)} x 100 b) % reg = {[(full-load) - (no-load)] (full-load)} x 100 c) % reg = [(no-load) - (full-load)] ÷ (full-load)} x 100 d) none of the above
- A 24V DC generator supplies power to the load resistor, determine the power dissipated in the 4-ohm load resistor using two (2) different methods.Usually the generator with the ___________ cost of generation will be loaded first. a. costly in omr b. Low cost diesel c. Cheapest d. moderate• T or F, modify the wrong part if False, please underline twice your answer if True or False. During working operation of a wave-wound DC generator, since the generated EMF is directly proportional to the number of poles, you can increase the number of poles to increase the amount of generated EMF.
- A 400 v, 50 Hz, three phase alternators, rated at 75 kVA, is star connected and driven at 1000 r/min. The windings of the alternator have a resistance, per phase, of 0.03 Ω and synchronous reactance, at 50 Hz per phase, of j0.325 Ω. The stator of the alternator has 108 slots, with 8 conductors, per slots, in a double layer. The maximum pole flux is 8.772 x 10-3 Wb. To improve the wave form only 80% of the pole pitch is wound. Determine the smallest lagging power factor at which the alternator can deliver its rated loadThere is a three-phase system such that the phase current in the generator, lines and charging phase is the same. The phase voltage in the generator must be 1000 [V] with clockwise sequence. The connected load must be such that the phase current in each load is 10 [A] and its power factor is 0.97 “lagging”. a) Determine phase currents in the generator, lines and phase in the loadIn a three-phase star connected alternator it is necessary to generate 7200 line voltage at frequency of 50 Hz. by rotating it at 1000 rpm. There are 6 slots per pole per phase in the stator and 20 conductors per slot. Calculate the following. a) Number of poles (2) Useful flux per pole. Assume that the conductors in a phase are connected in series and the winding is the full pitch winding.