A 50 Hz, 4 pole turbo alternator rated at 20 MVA, 13.2 kV has inertia constant H=4 kW sec/kVA. The KE stored in the rotor at synchronous speed is

Q: At starting of an Induction motor, the frequency of the rotor induced voltage would be

A: Mutual Induction:  Whenever flux in one coil links with the second coil, an EMF is induced in the…

Q: Q3) Assume two cylindrical surface charge densities of 8 and 4 nC/m² with radii of 2 and 6 cm,…

A: Any charged particle produces an electric field. This electric field is directed from the positive…

Q: Explain how two or more alternators can be synchronised

A: We need to explain how two or more alternators can be synchronised.

Q: At rest condition, the slip of induction motor is 1. Select one: O True O False

A:

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

A:

Q: An alternator is generating an emf per phase of EO while the rotor is rotating at a speed of 3000…

A: We know that  Ephase=4.44Kpkdfrequency*flux*turn frequency=speed*no of pole /120

Q: 2. Determine the drift in the Q-point for the two biasing circuits and therefore compare their bias…

A: 1. Fixed bias circuit -  The fixed bias circuit diagram is shown below, The circuit presented is…

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

A: We will establish a relation between generated emf and the speed with which the rotor is rotating to…

Q: A three phase induction motor operating at a slip of 5 % develops 20 kw rotor output power. What is…

A: The rotor copper loss in the above given operating conditions is calculated as shown below:

Q: In an induction machine stator has 8 poles and is excited by a 60 Hz source. If the rotor is driven…

A: Sycronous speed=120×frequencypoles=120×608                   =900 r.p.m Given rotor rotates in…

Q: An isolated 50 Hz synchronous generator is rated at 15 MW which is also maximum continuous power…

A: An isolated 50 Hz synchronous generator rated at 15 MW, Droop=5%, Three loads of 4 MW each at 50 Hz,…

Q: A 25 MVA, 4-pole, 50 Hz turbo-alternator has an inertia constant H = 5 kW sec/kVA. The stored…

A: Given: A turbo alternator has, Power rating, S = 25 MVA Inertia constant, H = 5 kW sec/kVA

Q: The power supplied to a three-phase induction motor is 20kW and the stator losses are 1000W. If the…

A:

Q: 6-For 400 MJ stored energy in the rotor at synchronous speed, what is the inertia constant H for a…

A:

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

A:

Q: A separately excited DC generator is rated at 172 kW, 430 V, 400 A and 1800 rpm. Its magnetization…

A: The Given Separately Excited DC generator is rated at 172kW,430V,400A and 1800r/min The…

Q: Generators using salient pole structure rotors are called turbo-alternators. Select one: O True O…

A: The explanation is as follows.

Q: A synchronous generator has 15 slots per pole. If each coil spans 8 slot pitches, what is the value…

A: slot angle = 180slot per pole = 18015 = 12  pole pitch = no. of slots per pole = 15 but coil span is…

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 6 pole DC wave wound generator has 28 armature conductors with flux per pole is 25 mWb and the…

A: Let N is be the speed in rpm EMF induced = flux×speed N ×no. of conductors60×no.of polesno.of…

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: A synchronous generator generates 350 V at 55 Hz when the field current is 3.7A. The e.m.f generated…

A: The solution is given in next step.

Q: The number of stator poles produced in the rotating magnetic field of a 3-ϕ  induction motor having…

A: We can use the formula,P = 2n- P is the number of stator poles- n slots per pole per phase Given,n =…

Q: A20 The speed at which the magnetic field of a 3-phase induction motor rotates is called the

A:

Q: 8. If the diode polarity is reversed in item number 6, what is the diode current? The diode voltage?

A:

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

A:

Q: A synchronous generator has 12 slots per pole. If each coil spans 7 slot pitches, what is the value…

A: Slot angle=180slot per pole. pitch factor=cos(slot pitch angle in degree 2)

Q: A 60 Hz alternator stator is wye connected with each phase winding having 24 turns of wire. The…

A: f=60HzT=24 turnsϕ=0.103 weber

Q: List 3 differences between how 3 phase induction motors and single phase induction motors work

A: Induction motor is a widely used machine in the industry and for commercial purposes. based on the…

Q: The sync be regula speed.

A:

Q: how does the rotor of a 3-phase induction motor get power a-  through brushes and commutador…

A: In this question we need to choose a correct option.

Q: A three-phase star connected alternator has 6 poles and must give an f.e.m. 380 V at 50 Hz. The…

A: In the question, A three-phase star connected alternator  Number of poles P=6 poles Induced emf E=…

Q: Electrical Machines A 4-pole single-phase induction motor is rotating in a clockwise direction at a…

A: Given- 4-pole single phase induction motor, Number of poles P=4, Frequency f=50 Hz, N=1000 rpm,…

Q: A a Single phase 400W, 50 Hz motor takes Suply current of SOA at power factor of 0.6 Lagging The…

A:

Q: 2. A 220V 30 6poles 50Hz induction motor is running at a slip of 3.5 %. Find the following: (a) slip…

A: 2. Given, 3-phase induction motor having  Supply Voltage, V = 220 Volts Number of poles, P = 6…

Q: 8max : 0:5 T 0.ST, 1800 rpm O.5T In a two pole 3-p synchronous generator, the peak flux of rotor…

A: The solution can be achieved as follows.

Q: A synchronous generator is generating 300 V at 55 Hz at a field current of 3.4A. The e.m.f generated…

A: In this answer let us try to understand the relation between the emf generated in the synchronous…

Q: A six pole synchronous generator operates at 60 Hz. Find the speed of operation

A: It is given that:

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 50 Hz, 10 MVA, 11 kV generator has an inertia constant of 10 MWS/MVA. What is the angular momentum…

A: Given: MVA rating, G=10 MVA Inertia constant, H=10 MJMVA Frequency, f = 50 Hz

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.