Electrical Machines The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ? 18.25%. 15.30%. 16.67%. 14.28%. 18.25%. 15.30%. 16.67%. 14.28%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is 2, 3 1, 3 2, 4 1, 4 2, 3 1, 3 2, 4 1, 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is 0.4. 0.6. 1. 0.8. 0.4. 0.6. 1. 0.8. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is Fmax. 3Fmax. (1/2)Fmax. (3/2)Fmax. Fmax. 3Fmax. (1/2)Fmax. (3/2)Fmax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous motor can be started by coupling it with a DC compound motor. coupling it with a small AC induction motor called the pony motor. providing damper winding in its rotor circuit. any of the above methods. coupling it with a DC compound motor. coupling it with a small AC induction motor called the pony motor. providing damper winding in its rotor circuit. any of the above methods. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The starting resistance of DC motor is generally around 500 ohms. Low. Infinitely large. 1000 ohms. around 500 ohms. Low. Infinitely large. 1000 ohms. ANSWER DOWNLOAD EXAMIANS APP
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