Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is 3Fmax. (3/2)Fmax. (1/2)Fmax. Fmax. 3Fmax. (3/2)Fmax. (1/2)Fmax. Fmax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In most condition which frame of motor will be preferred? Drip proof. Totally enclosed fan coiled. Splash proof. Open type. Drip proof. Totally enclosed fan coiled. Splash proof. Open type. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hysteresis loss will depends on f³ f² f1.6 f f³ f² f1.6 f 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. 0.8. 1. 0.6. 0.4. 0.8. 1. 0.6. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will reduce by 5 %. increase by 5 %. remain unchanged. depend on other factors. reduce by 5 %. increase by 5 %. remain unchanged. depend on other factors. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be C - A - B. B - C - A. A - C - B. B - C - A or C - A - B. C - A - B. B - C - A. A - C - B. B - C - A or C - A - B. ANSWER DOWNLOAD EXAMIANS APP
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