Electrical Machines A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be 470 rpm. 540 rpm. 450 rpm. 240 rpm. 470 rpm. 540 rpm. 450 rpm. 240 rpm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will Remain unchanged. Depends on other factor. Reduce by 5%. Increase by 5%. Remain unchanged. Depends on other factor. Reduce by 5%. Increase by 5%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a single phase induction motor, the starting torque developed is proportional to V² supply voltage V 1/V 1/V² V² supply voltage V 1/V 1/V² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Open circuit in a transformer is prefered with rated transformer current direct current high frequency supply rated transformer voltage rated transformer current direct current high frequency supply rated transformer voltage ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes : 1 and 3 1 and 2 2 and 3 1, 2 and 3 1 and 3 1 and 2 2 and 3 1, 2 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the highest possible speed of turbo alternators? 3000 rpm 1000 rpm 4000 rpm 1500 rpm 3000 rpm 1000 rpm 4000 rpm 1500 rpm ANSWER DOWNLOAD EXAMIANS APP
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