Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as V² f V f² V² f V f² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.96 1.06 0.87 0.95 0.96 1.06 0.87 0.95 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The residual magnetism of a self-excited dc generator is lost. To build up its emf again the field winding connection must be reversed the armature connection must be reversed field winding must be excited by low voltage dc supply the field winding must be replaced the field winding connection must be reversed the armature connection must be reversed field winding must be excited by low voltage dc supply the field winding must be replaced ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will not run. run in a direction opposite to previous one. continue running in the same direction as before. get damaged. not run. run in a direction opposite to previous one. continue running in the same direction as before. get damaged. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Series generators are used in which of the following applications? Air crafts. All of these Used as boosters in dc distribution or transmission. Arc welding. Air crafts. All of these Used as boosters in dc distribution or transmission. Arc welding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The field divertor resistance for a DC series motor is of order of 100 Ω 0.1 Ω 50 Ω 10 Ω 100 Ω 0.1 Ω 50 Ω 10 Ω ANSWER DOWNLOAD EXAMIANS APP
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