Electrical Machines What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field? None of these Zero Slip speed Synchronous speed None of these Zero Slip speed Synchronous speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Generator works on the principle of production static induced emf. dynamically induced emf. both A and B. None of these static induced emf. dynamically induced emf. both A and B. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to 0.5 p.u 0.125 p.u 0.25 p.u 0.75 p.u 0.5 p.u 0.125 p.u 0.25 p.u 0.75 p.u ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are effects of armature reaction? increase the maintenance and repair increase the iron loss increases the design cost All of these increase the maintenance and repair increase the iron loss increases the design cost All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 67.5% 82.5% 78.5% 72.5% 67.5% 82.5% 78.5% 72.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Dynamic braking can be used for All of these shunt motors. series motors. compound motors. All of these shunt motors. series motors. compound motors. ANSWER DOWNLOAD EXAMIANS APP
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