Electrical Machines In DC machine torque depends on which of the following? speed flux (φ) armature current (I) both A and B speed flux (φ) armature current (I) both A and B ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents? primary = 11.4 A, secondary = 301 A primary = 602 A, secondary = 22.7 A primary = 22.7 A, secondary = 602.4 A primary = 301 A, secondary = 22.7 A primary = 11.4 A, secondary = 301 A primary = 602 A, secondary = 22.7 A primary = 22.7 A, secondary = 602.4 A primary = 301 A, secondary = 22.7 A ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is 1 and 3 1 and 2 1 alone 2 and 3 1 and 3 1 and 2 1 alone 2 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is 2, 4 1, 3 1, 4 2, 3 2, 4 1, 3 1, 4 2, 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The dc motor which can provide zero speed regulation at full load without any controller, is shunt. series. differential compound. cumulative compound. shunt. series. differential compound. cumulative compound. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator if field winding attains the critical resistance machine will generate maximum power. machine will generate maximum voltage. the voltage generated will be zero. field winding will burn. machine will generate maximum power. machine will generate maximum voltage. the voltage generated will be zero. field winding will burn. ANSWER DOWNLOAD EXAMIANS APP
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