Electrical Machines In a transformer zero voltage regulation is achieved at a load power factor which is unity lagging zero leading unity lagging zero leading 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 920 RPM 970 RPM 960 RPM 940 RPM 920 RPM 970 RPM 960 RPM ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by increasing field excitation. compensating winding and commutating poles. shifting the brush axis from GNA to MNA. fixing the brush axis inline with the pole axis. increasing field excitation. compensating winding and commutating poles. shifting the brush axis from GNA to MNA. fixing the brush axis inline with the pole axis. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines No load test of 3-phase induction motor gives which of the following? constant loss None of these variable loss both A and B constant loss None of these variable loss both A and B ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as 3 to 5. 1.0. 2 to 3. 1.5 to 2. 3 to 5. 1.0. 2 to 3. 1.5 to 2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Rotating part of DC motor is known as Armature. Carbone brush. Starter. Pole. Armature. Carbone brush. Starter. Pole. ANSWER DOWNLOAD EXAMIANS APP
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