An industrial plant consists of several induction motors. The plant absorbs 300 kW at 0.6 PF lagging from the substation bus. Compute the required kVAR rating of the capacitor connected across the load to raise the power factor to 0.9 lagging. A 200-hp, 90% efficiency, synchronous motor is operated from the same bus at rated conditions and 0.8 power factor leading. Calculate the resulting power factor.

Q: A Three-phase four-pole AC machine has 60 coils in the stator and each coil has 100 turns. The coils…

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Q: Consider a transformer with a primary coil consisting of 1490 turns and a secondary coil of 1900…

A: Given in the question: Turns in the primary winding = N1 = 1490 Turns in the secondary winding, N2 =…

Q: A transformer has a rated output of 400 kVA at a power factor of 0.6. Determine the rated power…

A:

Q: A transformer has a rated output of 400 kVA at a power factor of 0.6. Determine the rated power…

A: As per the question, it is given that Rated output (S) = 300 kVA Power factor (ϕ) = 0.6 We have to…

Q: If rotor of an induction motor turns at synchronous speed, the frequency of the rotor will be zero.…

A: In this question we need to verify the given statement is true or false.

Q: Select the following condition on three phase induction motor which gives very low value of slip. O…

A: Choose the correct option Which condition gives low value of slip on 3 phase induction motor.

Q: A transformer has a rated output of 300 kVA at a power factor of 0.6. Determine the rated power…

A: As per the question, it is given that Rated output (S) = 300 kVA Power factor ϕ= 0.6 We have to find…

Q: Consider a transformer with a primary coil consisting of 1226 turns and a secondary coil of 1078…

A: Number of turns on primary side, N1=1226. Number of turns on secondary side, N2=1078. The RMS…

Q: Q2. A 3-phase, 100 H.P. (74.6 kW) induction motor has a p.f. of 0-75 lagging and efficiency 93%. A…

A: The complex power in an AC system is defined as the product of rms value of applied voltage and…

Q: The generated voltage per phase of an alternator is E0 while the speed of rotor rotation is 3000…

A: We will establish the relation between the generated voltage and the speed of the alternator.

Q: A three-phase star-connected, 50-Hz generator has 48 coils per phase and a flux per pole of 0.1 Wb.…

A: Note: Since nothing is specified, so we will consider full pitch coil with pitch factor kc=1. One…

Q: A transformer has a rated output of 200 kVA at a power factor of 0.8. Determine the rated power…

A: It is given that: Rated output=VI=200 KVA=200×103 VAPower factor=cosϕ=0.8

Q: A transformer has a rated output of 200 kVA at a power factor of 0.8. Determine the rated power…

A: Given: Rated power, VI = 200kVA Power Factor = 0.8 The power output and reactive power can be…

Q: Question 1. An industrial load consisting of a set of induction motors connected to a 220 V 60 Hz…

A:

Q: The voltage regulation of an alternator having 0.75 leading power factor load, no-load induced emf…

A: Given: An alternator no load induced emf, Vnl=2400 V Terminal full load voltage, Vfl=3000 V Load…

Q: 3. Find (a) the no-load phase voltage, (b) Kc and (c) Kd of a star- connected, 3-phase, 6-pole…

A: Number of poles is, .Speed, .Flux per pole, ..Each coil has turns and the coil is chorded by one…

Q: small 4-pole generator with a six-turn rotor coil generates the following voltage wave: e = 169.706…

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Q: Assume that a three-phase 700KW, 50 Hz, 4200V (Line to Line) Wye-connected induction motor has a…

A: The solution is given below

Q: The full load speed of a 60 Hz, 3-phase induction motor is 1120 r.p.m. The number of poles in the…

A: induction motor always near to synchronous speed  and synchronous speed =120*frequencyn. of poles…

Q: A 50 Hz, 3-phase induction motor is working at a full load speed of 1440 r.p.m. The number of poles…

A: Full load speed = 1440 f = 50 Hz

Q: Permanent-split capacitor motor is in effect a 2-phase motor and at no load could attain the…

A: True and false?  Permanent-split capacitor motor is in effect a 2-phase motor and at no load could…

Q: If a 4-pole induction motor has a synchronous speed of 1500 r.p.m., then, supply frequency is

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Q: Comment briefly on the relationship between input and output power at varying excitation levels and…

A: Infinite Bus Bar is the bus bar where many(infinite)  synchronous machines are connected.  The…

Q: The synchronous speed for 60 Hz induction motor can be equal to 3000 RPM. O True O False

A: An induction motor is a self starting motor and it doesn't run at the synchronous speed

Q: the single phase induction motor can not be rotate without auxiliary winding * I true ) false

A:

Q: operating frequency

A: Given- Power factor= 0.8 Frequency= 62 Hz Damping coefficient= 2 MW/Hz Power= 2 MW

Q: A three-phase, star-connected alternator has 8 number of poles, armature with 160 slots and 2…

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Q: A transformer has a rated output of 200 kVA at a power factor of 0.8. Determine the rated power…

A: Rated output of transformer=200 kVAPower factor=0.8We have to find the rated output power and…

Q: A synchronous motor capable of operating with a leading power factor draws 15 kW from a distribution…

A: Synchronous motors revolve with a constant (synchronous) speed, as the name suggests. This type of…

Q: Explain how the real and reactive power is controlled in synchronous generators.

A: Synchronous generators: Synchronous generators, also known as alternators, are a type of electrical…

Q: The voltage regulation of an alternator having 0.75 leading power factor load, no-load induced emf…

A: Power factor decides only the terminal voltages But once the voltages are known  Power factor has no…

Q: tors with fiux per pole is 21 mwbD and the e m.f generated is 63 V, then the speed of the machine is…

A:

Q: A Star 3Phase source with phase voltage of 400V at 50HZ is connected to a delta connected 3Phase AC…

A: In the Star Connection, the 3 winding's similar endpoints are connected to a common point known as…

Q: transformer has a rated output of 400 kVA at a power factor of 0.6. Determine the rated power output…

A:

Q: A transformer has a rated output of 300 kVA at a power factor of 0.6. Find the rated power output…

A: We need to find out the power and reactive power for given transformer .

Q: A 4-pole induction motor, supplied by a slightly unbalanced three-phase 50 Hz source, is rotating at…

A: Given an induction motor with, Total number of pole, P=4. Frequency, f=50 Hz. Rotor speed, Nr=1440…

Q: A transformer has a rated output of 200 KVA at a power factor of 0.8. Determine the rated power…

A: Given: Rated output V.I=200 kVA and p.f.=cosϕ=0.8

Q: An ac controller has a resistive load of R 10 2 and the input is 220 V, 50 Hz. The thyristors switch…

A: There are several types of power electronics converter we use in electrical engineering, such as:…

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.