Electrical Machines The constant losses in transformer is/are copper loss. eddy current loss. hysteresis loss. both 2 and 3. copper loss. eddy current loss. hysteresis loss. both 2 and 3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated) changes to 0.5 times the original value remain the same as the original changes to 1.5 times the original value changes to three times the original value changes to 0.5 times the original value remain the same as the original changes to 1.5 times the original value changes to three times the original value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The frame of an induction motor is made of closed grained cast iron. stainless steel. aluminium. silicon steel. closed grained cast iron. stainless steel. aluminium. silicon steel. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at 1000 rpm zero speed 750rpm 1500 rpm 1000 rpm zero speed 750rpm 1500 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is 2.2 Ω 1.9 Ω 5.7 Ω 6 Ω 2.2 Ω 1.9 Ω 5.7 Ω 6 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of 2 / 3. 5 / 6. 4 / 5. 6 / 7. 2 / 3. 5 / 6. 4 / 5. 6 / 7. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS