The star-connected rotor of an induction motor has a standstill impedance of (0.4 + j4) ohm per phase and the rheostat impedance per phase is (6 + j2) ohm. The motor has induced emf of 80V between slip-rings at standstill when connected to its normal supply voltage. Find (a) rotor current at standstill with the rheostat in the circuit (b) when the slip-rings are shor circuited and the motor is running with a slip of 3%

Q: 'hy does a slip occur in the three-phase induction motor? Expla

A: In a three phase induction motor, a three phase supply with a phase difference 120…

Q: When slip of a three phase induction machine becomes negative, it will be functioning as a motor.…

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Q: If the no-load speed of a squirrel cage induction motor connected to a three-phase, 50 Hz is 12.…

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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: Describe the simulation of three phase induction motor

A: Three Phase Induction Motor: A three-phase induction motor is an electro mechanical energy converter…

Q: We use stroboscope to calculate the torque of three- phase induction motor?* True False

A: Scroboscope is used to measure the speed of induction motor.

Q: T-a. The direction of rotation of a single-phase split-phase motor can be change by........ a)…

A: According to guidelines we need to solve only the first question. According to the question, define…

Q: Question: A three-phase induction motor is running at 5 percent slip with certain load. If at this…

A: Given- A three-phase induction motor with. % slip, s = 5 % = 0.05. Power input to the rotor,…

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

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Q: A four-pole induction motor drives a load at 2575 rpm. This is to be accomplished by using an…

A:

Q: component is fabricated using cast iron in an Induction motor. Bearings Stator frame Rotor stator…

A: 3-Phase Induction Motor- 3-Phase induction machine- When three-phase stator displaced by 120' is…

Q: The rotor winding of the induction motor at no load condition is equivalent to O connected to an…

A: Rotor Winding of the Induction Motor at No load Condition is Equivalent

Q: A 18600 W induction motor with six poles operates at 60Hz and shows a full-load slip of 6%: i) What…

A: Given: An induction motor has, Rated power, P0=18600 W Poles, P=6 Frequency, f=60 Hz Slip, s=6%=0.06…

Q: the efficiency of the 1 phase induction motor could be better increased by adding a permanently…

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Q: Armature reaction in an alternator primarily affects

A: Conceptual Background:- Armature Reaction:- Simply put, the armature reaction depicts how the…

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

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

Q: he speed of an induction motor fed from a 3-phase and 50 Hz source is 1440 rpm, so which of the…

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Q: What are the following statements are true for a three-phase induction motor? I. Three-phase…

A: We need to select correct statement regarding three phase induction motor.

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: The number of poles in the rotor circuit of a 3-phase induction motor is O Always two. Zero, because…

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Q: Draw the squirrel cage rotor of the three phase induction motor and explain the same.

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

A: The explanation is as follows.

Q: The armature of a DC machines is made up of If a 3-phase induction motor has synchronous speed of…

A: find explanation below

Q: When the field current (If) is increased towards its rated value in the DC shunt generator, the…

A: Given, DC shunt generator, If, field current is increased

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: 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: Which of the following NEMA design classes of Induction motor has double-cage rotor? Both Class-D…

A: Class C

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

A: Solution : Slip of  induction motor is 2 to 3% when the motor is operated under the rated load.

Q: If a 4-pole induction motor has a synchro- nous speed of 1500 rp.m., then, supply fre- quency is (1)…

A: Given, An induction motor with, Number of poles, P=4 Synchronous speed, Ns=1500 rpm

Q: ii)Conduct suitable tests to measure the copper loss occurs in a three phase Induction Motor.

A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,…

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: Types of three phase induction motor and its construction.

A: We need to tell about types of three phase induction motor and its construction.

Q: electrical and mechanical properties of an induction motor at no load, nominal load, and breakdown

A: Induction Motor- Induction motor is a motor which is also known as AC motor in which current…

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 460 V, 25 hp, 60 Hz, wye-connected, four-pole induction motor has the following impedances in ohms…

A: Note : As per the rules we can answer only 3 sub-parts, please post the remaining sub-parts as the…

Q: The impedance of the main winding of a single-phase induction motor is (9+j5) Q. The impedance of…

A: Given data, Zm=9+j5Za=4.5-j10V=120 Vf=60 Hz Now, Current in the main winding is…

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: The rotor resistance and stand still reactance of a 3 phase induction motor are 0.02 0/phase and…

A: It is given that:

Q: At rest condition, the slip of induction motor is 0. Select one: True False

A: slip of induction motor = Synchronous speed - motor speedsynchronous speed

Q: A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an…

A: speed of the induction motor    Nr = 2478 rpm dc voltage  V = 400 V  number of poles P= 4  slip =…

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.