Electrical Machines A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be 6 V somewhat more than 230 V 230 V somewhat less than 230 V 6 V somewhat more than 230 V 230 V somewhat less than 230 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that Eb is zero, but Td is unchanged both Eb and Td are zero both Eb and Td are unchanged Eb is unchanged, but Td is zero Eb is zero, but Td is unchanged both Eb and Td are zero both Eb and Td are unchanged Eb is unchanged, but Td is zero 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 alone 2 and 3 1 and 2 1 and 3 1 alone 2 and 3 1 and 2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor is more expensive for same KW output rating ? Synchronous motor. AC single phase motor. Induction motor. DC Shunt Motor Synchronous motor. AC single phase motor. Induction motor. DC Shunt Motor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Tap changer is generally provided in current transformer. voltage transformer. power transformer. earthing transformer. current transformer. voltage transformer. power transformer. earthing transformer. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generator, armature reaction refers to what? None of these Effect of armature flux on the load. Effect of field flux on the armature flux. Effect of armature flux on the main field flux. None of these Effect of armature flux on the load. Effect of field flux on the armature flux. Effect of armature flux on the main field flux. ANSWER DOWNLOAD EXAMIANS APP
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