Electrical Machines What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ? Copper loss core loss only windage and friction loss both 1 and 2 Copper loss core loss only windage and friction loss both 1 and 2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then I1 = I2 I1 < I2 None of these I1 > I2 I1 = I2 I1 < I2 None of these I1 > I2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as 1.5 to 2. 2 to 3. 1.0. 3 to 5. 1.5 to 2. 2 to 3. 1.0. 3 to 5. 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 970 RPM 960 RPM 920 RPM 940 RPM 970 RPM 960 RPM 920 RPM ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor has the highest power factor at full load? Resistance split phase Capacitor run Capacitor start Shaded pole Resistance split phase Capacitor run Capacitor start Shaded pole ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence? BYR BRY RBY All of these BYR BRY RBY All of these ANSWER DOWNLOAD EXAMIANS APP
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