Electrical Machines The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease? 19% 10% 40% 5% 19% 10% 40% 5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For small value armature current Ia the torque developed by a DC series motor is proportional to √Ia. Ia2. Ia. 1/Ia. √Ia. Ia2. Ia. 1/Ia. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as A capacitor. an inductor. None of these. A resistor. A capacitor. an inductor. None of these. A resistor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines φA 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 speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 940 RPM 960 RPM 970 RPM 920 RPM 940 RPM 960 RPM 970 RPM 920 RPM ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines which of the following type of brush and their application is/are correct electro graphite → large ratings copper graphite → low voltage high current density All of these carbon brush → normal ratings electro graphite → large ratings copper graphite → low voltage high current density All of these carbon brush → normal ratings ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generator, which component plays the vital role to produce the direct current? Brush. Commutator. Yoke. Armature. Brush. Commutator. Yoke. Armature. ANSWER DOWNLOAD EXAMIANS APP
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