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Performance Equations of Three Phase Induction Motor
When balanced 3-? voltages are applied to the stator winding a rotating magnetic field of constant amplitude is produced in the air gap. The speed of this rotating field is given by .
The rotating flux wave cuts the stationary rotor conductors and therefore emf are induced in the rotor conductors. As the rotor circuit is short circuited these induced emfs give rise to current in the rotor conductors. The interaction of these rotor currents with rotating flux wave produces torque in the rotor of a 3-? induction motor and as a consequence rotor begins to rotate. According to len law the develop torque must oppose the cause by which it is produce i flux cutting action. This is possible only if the developed torque forces the rotor to rotate in the direction of rotating field. Due to this the relative speed between rotating flux and rotor conductors is reduced and therefore the flux cutting action also gets reduced. This relative speed between rotating flux wave and rotor.
Ceramics are good (A) Insulators. (B) Conductors. (C) Superconductors. (D) Semiconductors. Ans: Ceramics are good insulators.
RRC Rotate Accumulator Right Instruction This instruction also rotates the contents of the accumulator toward right by one bit. The D 7 bit moves to D 5 position a
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Given S(F) = A'B +'C'D + C'D +'A'B + 'A B + 'A 'C + 'A D + 'A C A. DRAW A MINIMIZED CIRCUIT USING ONLY OR AND NOT GATES (2 input gates) B. WRITE THE WIRE LIST Example of a
A large induction motor is usually started by applying a reduced voltage across themotor; such a voltage may be obtained from an autotrans- former. A motor is to be started on 50%
Break over voltage of Finger Voltage The minimum forward voltage when the gate is opened at which SCR starts conducting heavily is called the break over voltage. To
Energy Conservation Our country has a vast potential of energy saving. It is estimated in which measures for energy conservation and improving energy efficiency have the pote
Each of the following functions is abs(H(jw))^2 of a certain network function H(s). Obtain all the possible H(s) for each given abs(H(jw))^2. [(w^4)+25]/[(w^4)+(12w^2)+49]
The power transferred across the air gap of a two pole inductionmotor is 24 kW. If the electromag netic power developed is 22 kW, find the slip. Calculate the output torque if the
Determine RMS and average value: Determine RMS and average value of the output of half wave rectifier. Solution The waveform of current, output of the half wave rectif
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