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Answer: In transformer protection, harmonic restraint feature is incorporated to guard against magnetizing inrush current.
In case of motor it produces unidirectional torque. What is the choice of material for the yoke? It is defined as the distance on the periphery of the armature between two coil sides of a coil. Usually, it is expressed in terms of no of slots or degrees electrical. The factor by which there is a reduction in the emf due to short pitching of the coils is called coil span factor. It is defined as the ratio of the resultant emf when coils are short pitched to the resultant emf when coils are full pitched.
The factor by which there is a reduction in the emf due to distribution of coils is called distribution factor K d. The distribution factor is defined as the ratio of resultant emf when coils are distributed to the resultant emf when coils are concentrated. It is also known as winding factor or breadth factor.
Give the relation between electrical angle and mechanical angle. The angle through which an induced alternating emf travels for mechanical rotation of conductors is called an electrical degree.
For 2 pole machine, electrical angle is same as mechanical angle of rotation. The angle through which the rotor or conductors of the machine rotates physically is called Mechanical Angle.
While the angle through which is induced emf in the conductors travels is called Electrical Angle. The speed of the synchronous machine for which it produces alternating emf at a specified rated frequency for a fixed number of poles is called its synchronous speed.
It is denoted as N S. How it is converted to DC? The basic nature of the induced emf in a dc generator is alternating.
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What is a Transformer 2. How are Primary and secondary windings of a Transformer connected 3. Name different types of Transformer based on Number of windings 4. Where Transformers are applicable 5. How does electrical energy transfer takes place in Transformers 6. Why does Transformers are know as to have high efficiency 7.
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In case of motor it produces unidirectional torque. What is the choice of material for the yoke? It is defined as the distance on the periphery of the armature between two coil sides of a coil. Usually, it is expressed in terms of no of slots or degrees electrical.
A list of top frequently asked Electrical Machines interview questions and answers are given below. A Single-phase autotransformer is a single winding transformer in which a part of the winding is common to both high-voltage and low-voltage sides. This law states that when we move any current carrying conductor in a magnetic field, then an EMF is induced in it.
What is the power factor of a transformer at no load? At no load, the power factor of a transformer is very low and lagging, whereas the power factor on load is nearly equal to the power factor of the load, which it is carrying. What is the normal phase difference between the voltage and the no-load current in a transformer?
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