Electrical Machines Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is none of these. less than that of second transformer. equal to that of second transformer. more than that of second transformer. none of these. less than that of second transformer. equal to that of second transformer. more than that of second transformer. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The function of field regulator in a DC compound motor is to control field current. none of above. limit the armature current. vary the armature resistance. control field current. none of above. limit the armature current. vary the armature resistance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as they have maximum efficiency and maximum starting torque. they have very good speed regulation. these are cheaper in cost, simple and rugged in construction. they are capable of operation under range of leading and lagging pf. they have maximum efficiency and maximum starting torque. they have very good speed regulation. these are cheaper in cost, simple and rugged in construction. they are capable of operation under range of leading and lagging pf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be 4.8% and -3.2% None of these 3.2% and -1.6% 6% and -4% 4.8% and -3.2% None of these 3.2% and -1.6% 6% and -4% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be 500 rpm 250 rpm 1000 rpm 2000 rpm 500 rpm 250 rpm 1000 rpm 2000 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages? Delta side leads by 30°. Star side leads by 30°. Star side lags by -30°. Delta side lags by -30°. Delta side leads by 30°. Star side leads by 30°. Star side lags by -30°. Delta side lags by -30°. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS