Electrical Machines If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then both hysteresis loss(Ph) and eddy current loss(Pe) will increase Pe will increase but Ph will decrease Ph will increase but Pe will decrease Ph will decrease but Pe will remain same both hysteresis loss(Ph) and eddy current loss(Pe) will increase Pe will increase but Ph will decrease Ph will increase but Pe will decrease Ph will decrease but Pe will remain same ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ? 210 V 230 V. 150 V. 240 V. 210 V 230 V. 150 V. 240 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Eg (generated emf) and Eb (back emf) both are same. changes. different. none of above. same. changes. different. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The voltage regulation of a DC generator at full load being zero implies that the generator is shunt connected. deferentially compounded. cumulatively compounded. series connected. shunt connected. deferentially compounded. cumulatively compounded. series connected. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Thin laminations are used in a machine in order to reduce Copper losses Eddy current losses Hysteresis losses Both 1 and 2 Copper losses Eddy current losses Hysteresis losses Both 1 and 2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the excitation is critical, the power factor of the alternator is leading power factor. None of these unity power factor. lagging power factor. leading power factor. None of these unity power factor. lagging power factor. ANSWER DOWNLOAD EXAMIANS APP
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