Electrical Machines What will be the eddy current loss if the supply frequency of a transformer becomes double? Four times. Remains same. Doubled. Eight times. Four times. Remains same. Doubled. Eight times. 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 Reduce by 5%. Depends on other factor. Remain unchanged. Increase by 5%. Reduce by 5%. Depends on other factor. Remain unchanged. Increase by 5%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Cogging of induction motor occurs at low voltage and when stator and rotor poles are not equal. low voltage and when stator and rotor poles are equal. high voltage and when stator and rotor poles are equal. high voltage and when stator and rotor poles are not equal. low voltage and when stator and rotor poles are not equal. low voltage and when stator and rotor poles are equal. high voltage and when stator and rotor poles are equal. high voltage and when stator and rotor poles are not equal. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Stability of a synchronous motor ---------- with the increase in excitation. decreases any of the above remains unaffected increases decreases any of the above remains unaffected increases ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The stator core of a 3 - Φ induction motor is laminated in order to reduce the weight of the stator. hysteresis loss. both of the above. eddy current loss. weight of the stator. hysteresis loss. both of the above. eddy current loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ? 2, 3 and 4 3 and 5 1 and 4 1, 2 and 5 2, 3 and 4 3 and 5 1 and 4 1, 2 and 5 ANSWER DOWNLOAD EXAMIANS APP
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