Electrical Machines 1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be 30 W more than 30 W zero watt less than 30 W 30 W more than 30 W zero watt less than 30 W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following generators are used in arc welding? series generators differential compound generators cumulative compound generators shunt generators series generators differential compound generators cumulative compound generators shunt generators ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator, the armature reaction results in demagnetization of centers of poles. magnetization of leading and demagnetization of trailing pole tip. magnetization of inter poles. demagnetization of leading & magnetization of trailing pole tip. demagnetization of centers of poles. magnetization of leading and demagnetization of trailing pole tip. magnetization of inter poles. demagnetization of leading & magnetization of trailing pole tip. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is less and maximum torque decreases less and maximum torque increases more and maximum torque remains constant more and maximum torque decreases less and maximum torque decreases less and maximum torque increases more and maximum torque remains constant more and maximum torque decreases ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then E ∝ f/φ E ∝ φ/f E ∝ 1/(φf) E ∝ φf E ∝ f/φ E ∝ φ/f E ∝ 1/(φf) E ∝ φf ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a seperately excited DC Motor if field current is increased, it will Reduce starting torque. Increase speed Increase acceleration duration. Reduce armature heating. Reduce starting torque. Increase speed Increase acceleration duration. Reduce armature heating. ANSWER DOWNLOAD EXAMIANS APP
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