The Line Voltage of a star connected three phase alternator is 255 Volts. The Phase Voltage (Vph ) will be

Q: The de armature resistance of a wye-connected alternator measured across its two terminals is 0.52.…

A:

Q: What is the difference between direct and alternating current? p 3:01 Why are alternating current…

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Q: A single phase AC motor draws 4.5 A from the 220 V, 50 Hz network. The active power drawn by the…

A: 1-ϕ AC motor draws current=4.5AI=4.5AV=220VP=720WSolving by the formula-P=VIcosϕPutting the values…

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.

Q: A 3-phase induction motor draws 50 kW from a 220 V, 50 Hz mains. The rotor emf makes 100…

A: Given, A 3-phase induction motor draws, Electrical input = 50 kW Stator losses = 2 kW Supplied…

Q: What is the difference between single-phase and three-phase alternating current? Select one: A.…

A: Single-phase supply consists of the two power legs - Phase and Neutral  Three-phase supply consist…

Q: When 40V DC voltage is applied to a single-phase AC motor, it draws 1A current. When 200v-50Hz AC is…

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Q: A 400 V , 50 Hz ,three phase alternator ,rated at 200 kVA at a lagging power factor of 0.835 , is…

A: Given: A 400 V, 50 Hz, three-phase alternator, rated at 200 kVA at a lagging power factor of 0.835,…

Q: A 36- pole alternator is operated at 200 rpm. What frequency is generated?

A: Given data: Pole, P = 36. Speed, Ns = 200 rpm.

Q: If you have 2 alternators delivering power to a load at a frequency of 60 hz, how can you make…

A: We know that reactive power is strongly related with excitation while active power is related with…

Q: An alternating current completes 5 cycles in 8 ms. What is its frequency?

A: Number of cycles = 5 Time = 8ms

Q: An alternator having 20 poles and running at 600 rpm will generate alternating voltage and current…

A: Frequency of alternating voltage =poles×speed120. Given poles= 20 and speed=600 r.p.m.

Q: The power input measurement to a synchronous motor is done using the two- wattmeter method. Each of…

A: This question belongs to measurements and instrumentation . It is based on the concept of two…

Q: two 3phase alternators in parallel are both operating at the same frequency. What is theremedy if…

A: Parallel operation of Alternator AC power systems are often interconnected for efficiency, reliable…

Q: On a 60 Hz power line, what is the time duration of the positive portion of one complete cycle?

A: Given data, frequency f = 60 Hz.

Q: How can you tell that the power pumped by an alternator is directly proportional to the load angle?

A: Alternator pumped the active power into the system but it does not give guarantee to pumped reactive…

Q: Explain the generation of single phase alternating voltage. Illustrate with a diagram.

A: The below figure shows the simple 1 loop single phase ac generator where a t turn coil is placed…

Q: Q20/ Complete the blank The Line Voltage of a star connected three phase alternator  is 255 Volts.…

A: as angle between VR and VY is 120o, the angle between VR and – VY is 180o – 120o = 60o

Q: The voltage-flux adjustment of a certain single phase 220 V induction watthour meter is altered so…

A: Given: Supply voltage, V = 220 V The meter is altered so that phase angle between flux and applied…

Q: A three-phase generator is connected to three 90 Q load resistors. Each coil generates 120 V ac. A…

A: We need to tell the current value through the neutral line.

Q: The open circuit characteristics (O.C.C) of an alternator is drawn between O Eo V/S If O Eo V/S Isc…

A: The open circuit test on the generator is performed by opening the armature terminals of the…

Q: The reactance of a generator is given as 0.55 pu based on the generator of 21 KV, 350 MVA. Determine…

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Q: The winding of a 3-phase, 6 pole, 60 cycle alternator has 2/3 pitch. What is the chording angle?

A: Given data ,  No. of pole (P) = 6 Frequency , f = 60Hz Pitch Factor  = 23 pitch

Q: Indicate the equation that allows determining the voltage generated per phase, in a three-phase…

A: The explanation is as follows.

Q: Before closing the synchronism switch to connect two alternators in parallel, it is observed in a…

A: Given: A set of 3 lamps

Q: An alternator has 6 poles. At what speed must it be driven to develop 120 cycles? Group of answer…

A: In this question we will find speed of given machine.....

Q: circuit connection diagram on how to synchronize an alternator to the grid using lab volt. using…

A: The purpose of the synchronization is to ensure that during the circuit breaker closure (closing the…

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.

Q: 36 slot 4 pole 3 phase alternator winding pg7 slot electrical angle by which the winding is quality…

A: Electrical machines can be either generator, transformer or motors. They can be either Ac machines…

Q: Determine the Total electrical and mechanical degree for an Alternator

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Q: An electrodynamometer type wattmeter is used to measure power in 1-o circuit. The connected load…

A: The solution is given below

Q: 11. The variation of generated voltage of AC Generator can be varied through a) the speed of the…

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Q: Make a general statement on the effect of increasing excitation to the power factor of the…

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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: 11.In a certain s constant (2T) are the values

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Q: What is the KW rating of a three phase 975 KVA generator at A) unity power factor B) 80% power…

A:

HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.