Measurement and Instrumentation Control Systems Electric Traction Industrial Drives Heating and Welding Series-parallel Circuits Passive Filters Quantities and Units Series Circuits Branch, Loop and Node Analyses Alternating Current and Voltage Inductors RC Circuits RLC Circuits and Resonance Three-Phase Systems in Power Applications Time Response of Reactive Circuits Circuit Theorems and Conversions Multi-Stage Transistor Amplifiers Solid-State Switching Circuits Regulated D.
Power Supply Modulation and Demodulation Transistor Tuned Amplifiers Oscillators Amplifiers with Negative Feedback Parallel Circuits Especially we are prepare for the Electrical Engineering freshers and professionals, these model questions are asked in the online technical test, Quiz and interview of many companies.
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Power Supply Modulation and Demodulation Transistor Tuned Amplifiers Oscillators Amplifiers with Negative Feedback Parallel Circuits Your email address will not be published. Skip to content Electrical Questions :- 1. Posted on by Leave a comment. Power engineers may work on the design and maintenance of the power grid i. What are the various kind of cables used for transmission? Why back emf used for a dc motor?
The induced emf developed when the rotating conductors of the armature between the poles of magnet, in a DC motor, cut the magnetic flux, opposes the current flowing through the conductor, when the armature rotates, is called back emf.
Its value depends upon the speed of rotation of the armature conductors. In starting, the value of back emf is zero. What is slip in an induction motor? Slip can be defined as the difference between the flux speed Ns and the rotor speed N. Speed of the rotor of an induction motor is always less than its synchronous speed. Explain the application of storage batteries. What are the different methods for the starting of a synchronous motor. Then rotor poles are excited due to which the rotor field is locked with the stator-revolving field and continuous rotation is obtained.
The machine is started as a squirrel cage induction motor first. When it picks up speed, excitation is given to the rotor and the rotor starts rotating continuously as the rotor field is locked with stator revolving field. Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.
The output terminals are equivalent to the constant source of current and it allows giving the parallel resistance. The parallel resistance of the network can be viewed from the open circuit terminals when all the voltage and current sources are removed and replaced by the internal resistance.
State Maximum power transfer theorem The Maximum power transfer theorem explains about the load that a resistance will extract from the network. This includes the maximum power from the network and in this case the load resistance is being is equal to the resistance of the network and it also allows the resistance to be equal to the resistance of the network.
This resistance can be viewed by the output terminals and the energy sources can be removed by leaving the internal resistance behind. Explain different losses in a transformer. Two types of iron losses are: o eddy current loss o Hysteresis loss. These losses depend upon the supply voltage, frequency, core material and its construction.
As long as supply voltage and frequency is constant, these losses remain the same whether the transformer is loaded or not. These are also known as constant losses. These losses depend upon the loading conditions of the transformers. Therefore, these losses are also called as variable losses. Explain different types of D. C motors? Therefore, it is suitable for constant speed drive, where high starting torque is not required such as pumps, blowers, fan, lathe machines, tools, belt or chain conveyor etc.
Therefore, motor is used in lifts, cranes, traction work, coal loader and coal cutter in coalmines etc. Its advantage is, it can run at NIL loads without any danger. This motor will therefore find its application in loads having high inertia load or requiring high intermittent torque such as elevators, conveyor, rolling mill, planes, presses, shears and punches, coal cutter and winding machines etc.
Explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine. Commutation: It is phenomenon when an armature coil moves under the influence of one pole- pair; it carries constant current in one direction. As the coil moves into the influence of the next pole- pair, the current in it must reverse. This reversal of current in a coil is called commutation.
Several coils undergo commutation simultaneously.
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