What is the reason why a synchronous motor can be found running at no load?

Q: Application of Synchronous motor ?

A: Some application of Synchronous machine: Power factor improvement Voltage regulation Constant-speed…

Q: What is the factor that enables the synchronous motor to operate at different electrical load…

A: Synchronous motor: The rotor of the synchronous motor rotates normally at the speed of the revolving…

Q: Why it is not possible to start the d. C. series motor without load ?

A:

Q: What is the synchronous speed of a motor that has four poles and is operating on 60 Hz?

A: Given:  Number of poles P = 4 Frequency F = 60 Hz We need to determine the synchronous speed of a…

Q: what are the three major types of split phase motors?

A: The three major types of split phase induction motors are: 1) resistance start induction motor…

Q: 6-1. What is the difference bet ween a synchronous motor and a synchronous generator? 6-2. What is…

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

Q: Q/ How does the synchronous motor work? Why can't the synchronous motor start on its own?

A: This is a good question based on simple electrical machine. And the chapter is basic circuit of…

Q: why automatic re-closers are not recommended in a system where large numbers of induction motors are…

A: Automatic Re-closer It is a protective switch-like circuit breaker designed to operate at a very…

Q: Why small voltage is built up immediately in rotating shunt machine eve without field excitation?

A: For every self excited generator there must exist some residual flux . When armature rotates…

Q: Q/ Explain how can the power factor of a synchronous motor be changed from Leading to lagging or…

A: Leading power factor- this power factor is used, when the load current leads the supply voltage.…

Q: Is it possible for load of a wye connected induction motor during the blocked rotor test to be…

A: In the blocked rotor test, a low voltage is applied which circulates a full load armature current…

Q: "Explain why speed of a DC motor get affected on load, if its series field winding is connected…

A: DC motor emf equation is given as, E=NPϕZ60AN=EA60PϕZk=PZ60ASo, N=EKϕ The torque equation of the DC…

Q: 4. A synchronous motor starts but fails to develop its full torque. What could it be due to?

A: I will be attending only question 4. Synchronous motor:                     Synchronous motors are…

Q: Why induction motor cannot run on synchronous speed? Explain using slip.

A: In an engine, simultaneous speed is the speed at which the attractive field pivots. Contingent upon…

Q: lue increase as the torque value increases?

A: An asynchronous motor is also known as an induction motor. A three-phase balanced supply is provided…

Q: What determines when a synchronour motor is at normal excitation?

A:

Q: If a synchronous machine is used as a motor. Which voltage is higher? The phase or the induced…

A:

Q: In Synchronous Motor Operation How the regulating characteristics can be obtained from V curve?

A: The V curve is the graph between the stator current and the field current for different loads on the…

Q: Is true that the DC supply is applied to the rotor windings of a synchronous motor?

A: The movement of the synchronous motor depends on the interaction of stator magnetic field with rotor…

Q: DC compound motor has lap-wound armature with 100 coils and 3 turns/coil. It is rotating with…

A: Given         DC compound  motor Lap-wound A=P(Number of poles)Number of coils…

Q: Why must a synchronous motor never be started when DC excitation is applied to the rotator

A: The motor will not turn and the induced voltage on the rotor can damage to power supply for the DC…

Q: Why must a synchronous motor never be started when DC excitation is applied to the rotor?

A: A synchronous motor never be start when DC excitation is applied to the router because

Q: How high is the rated torque of the separately excited shunt wound de motor?

A: DC Motor DC motor is a rotating electrical machine that converts direct current electrical into…

Q: How do you reverse the direction of rotation of a d.c. shunt motor?

A: The DC shunt motor has four terminals as stated below. a) two terminals of armature winding (A1 and…

Q: What is the typical speed regulation on a synchronous motor?

A: Consider that the synchronous motor is a motor that rotates with synchronous speed.

Q: electrical machines (How does an asynchronous motor behave when there is a load?) explain by…

A: Answer

Q: 3. For a three-phase asynchronous motor, its slip is s=0.03 at the rated condition, what is the…

A: As per guidelines given to us we can only provide the solution of first question in multiple type of…

Q: What will happen if we do not fix the voltage of the D.C shunt motor as the load increases?

A: What will happen if we do not fix the voltage of the D.C shunt motor as the load increases?

Q: Briefly explain why a synchronous motor requires starting mechanism. Is there any starting problem…

A: The synchronous motor requires a starting mechanism because; - over a certain measure, synchronous…

Q: 1. When a synchronous motor is at working condition, is there induced electromotive force in the…

A: This is belongs to synchronous motors

Q: For a 3-phase, 4-pole, 50 Hz synchronous motor the frequency, no. of poles, and the load torque are…

A: Given: P1=4f1=50 Hz The number of poles, frequency and load torque is halved.

Q: Is it possible for the line-line voltages of a wye connected induction motor during the blocked…

A: Blocked rotor test  Less voltage applied to Each phase of motor Rotor are blocked Full load current…

Q: Explain the effect of varying excitation upon the armature current and power factor of a three-phase…

A:

Q: What is the reason of the "pendulum" in a synchronous motor and how can it be corrected?

A: The term "pendulum" in a synchronous motor defines "Hunting". Hunting is such a phenomenon of…

Q: Why the dc shunt motor running at the infinity speed?

A: In this question , we will write about how dc shunt motor running at infinite speed..

Q: 1. How can you reverse the direction of rotation of a synchronous motor? 2. What effect does varying…

A: 1. The direction of rotation of a synchronous motor can be reversed by interchanging any two of the…

Q: A synchronous motor with negligible armature resistance operates at a nominal frequency of 25…

A: Given: At Nominal Frequency F , Load angle =25 degree   At increased frequency of 15 % of F , then…

Q: What is the relationship between asynchronous motor speed (n), load (Pa)?

A: In the induction motor  relationship between asynchronous motor speed (n) and load  power Pa

Q: Define pull out torque and what are the points to be considered when the load on the synchronous…

A: The pull out torque in the motor is expressed as the highest or maximum value of torque developed by…

Q: 1. When a synchronous motor is at working condition, is there induced electromotive force in the…

A: This question is belongs to synchronous motors

Q: What happens to rotor speed and current when mechanical load on an induction motor increases?

A: If load on an induction motor is increases then the current also increases accordingly the reason…

Q: Why, for a given induction motor, might it be possible to employ direct-on-line starting in one…

A: In this question we will write why different starting methods are employed for induction motor.....

Q: Explain, using phasor diagrams, what happens to a synchronous motor as its field current is varied.

A:

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.