Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / rama krishna
Direct current or DC electric motors work for situations
where speed needs to be controlled. DC motors have a stable
and continuous current. DC motors were the first and
earliest motors used. They were found, however, to not be as
good at producing power over long lengths. Electric
companies found using DC motors to generate electric did not
work because the power was lost as the electric was
transmitted. Brush DC motors use rings that conduct the
current and form the magnetic drive that powers the rotor.
Brushless DC motors use a switch to produce the magnetic
drive that powers the rotor. Direct current motors are often
found in appliances around the home.
Alternating current or AC electric motors are used
differently based on what type of AC motor it is. Single
phase AC motors are known as general purpose motors. They
work well in many different situations. These AC motors work
great for systems that are hard to start because they need a
lot of power up front. Three phase, also called polyphase,
AC motors are usually found in industrial settings. These
motors also have high starting power built transmit lower
levels of overall power. AC power gets its name from the
fact that it alternates in power. The amount of power given
off by an AC motor is determined by the amount of power
needed to operate the system.
| Is This Answer Correct ? | 2 Yes | 2 No |
Post New Answer View All Answers
700KW 6.6KV slip ring induction motor to use VFD to control the speed
How to justify this statement ??? "Capacitors in series provide less capacitance but higher voltage breakdown rating for the combination"
what is the generator rating for 40 amp load of 3phase motor.?? 400v voltage of generator... plz tell me with formula its urgent...plzzz... and also tell me that this 40 amp at all phases mean 40 amp on red,40 amp on yellow,40 amp on blue...... or the total sum of that 3phase is 40 amp....
How to work E.L.C.B and how to connect in circuit.
What kind of Neutral CT can be placed in 11/0.433KV transformer to be used and what are its specification?
I'm generating a pulse of 3V with frequency 80Hz (12.5ms time period) and pulse duration 0.125ms and feeding it to a transformer since i want the pulse to get amplified around 60V. At the output amplification s happening but the pulse is changed to a spike, can you tell me what could be the reason? (an ordinary transformer 220V-12V stepdown transformer is reverse connected ie. now it is 12V-220V stepup and voltage amplification happens)
How many sprinklers should be in one pipe line?
What is the test block protection relay if any body know plz explained
pls tell me about ups internal connection & we have given only 3 phase supply to ups system how get 4 wire (R Y B N )
Define corner frequency?
WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEMENT CHANGES IN TRANSFORMER?WHAT IS THE NEED TO BE PHASE SHIFT CHANGE BETWEEN THE PRIMARY AND SECONDARY WINDING
explain the function of brush less dc motor?
1. The DC generaror,s induced output emf is connected with a DC motor(as load). when increasing the load of the motor by using brake drum or any way. what are the parameters will changes in both motor and generator(voltage, current, resistance, frequency, speed, torque, power, flux etc...) 2. Similarly for AC generator and AC motor 3. similarly if using DC batteries instead of DC generator, What happens?
Hello Guys !! i want to rrb section engineer electrical(signal) previous model papers? any body help me?
what will happen if synchronous machine rotor fed from single phase ac supply
