Dc And Ac Machines Questions In Pdf
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Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque. DC Generators are classified into two types 1 separatly excited DC generator. DC Series motor has high starting torque.
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.
DC motor MCQ Test
In electrical engineering , electric machine is a general term for machines using electromagnetic forces , such as electric motors , electric generators , and others. They are electromechanical energy converters: an electric motor converts electricity to mechanical power while an electric generator converts mechanical power to electricity. The moving parts in a machine can be rotating rotating machines or linear linear machines. Besides motors and generators, a third category often included is transformers , which although they do not have any moving parts are also energy converters, changing the voltage level of an alternating current. Electric machines were developed beginning in the mid 19th century and since that time have been a ubiquitous component of the infrastructure. Developing more efficient electric machine technology is crucial to any global conservation, green energy , or alternative energy strategy. An electric generator is a device that converts mechanical energy to electrical energy.
Electrical Interview Questions
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. Electric motors can be powered by direct current DC sources, such as from batteries, or rectifiers , or by alternating current AC sources, such as a power grid, inverters or electrical generators. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy. Electric motors may be classified by considerations such as power source type, internal construction, application and type of motion output. In addition to AC versus DC types, motors may be brushed or brushless , may be of various phase see single-phase , two-phase , or three-phase , and may be either air-cooled or liquid-cooled.
Design of Electrical Machines Questions and Answers – Frames of D.C. & A.C. Machines · 1. What is the work of the frame of dc machines? · 2. Why is the length of.
Mechanical Engineering 1. MCQ Practice Tests. Timed Mock Tests. Online Quizzes.
Multiple Choice Questions are very important for different competitive examinations. Also, we call these as MCQs in short. Again, some of us call these as objective type questions.
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.