Electrical Machines The wattage rating of a ceiling fan motor will be 250 - 500 W. 10 - 20 W. 200 - 250 W. 50 - 150 W. 250 - 500 W. 10 - 20 W. 200 - 250 W. 50 - 150 W. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be 460 V 115 V 65 V 230 V 460 V 115 V 65 V 230 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Sparkless commutation can be achieved by employing any one or more of the above methods. high resistance carbon brushes. compensating winding. inter poles. any one or more of the above methods. high resistance carbon brushes. compensating winding. inter poles. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will improve and terminal voltage will rise . worsen and terminal voltage will fall worsen and terminal voltage will rise. improve but terminal voltage will fall. improve and terminal voltage will rise . worsen and terminal voltage will fall worsen and terminal voltage will rise. improve but terminal voltage will fall. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes : 1, 2 and 4 1, 2, and 3 1 and 3 2, 3 and 4 1, 2 and 4 1, 2, and 3 1 and 3 2, 3 and 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Ward-Leonard control is basically a ___________ control method. Armature resistance control. Armature voltage control. Field control. Field diverter control. Armature resistance control. Armature voltage control. Field control. Field diverter control. ANSWER DOWNLOAD EXAMIANS APP
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