Electrical Machines Where the shunt generators are widely used? Where the load is very high. Where often load fluctuation is occurred. Where a constant voltage is required over a narrow load range. Where voltage variation is needed over a wide load range. Where the load is very high. Where often load fluctuation is occurred. Where a constant voltage is required over a narrow load range. Where voltage variation is needed over a wide load range. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________. increased. kept constant to certain value. decreased. remains unchanged. increased. kept constant to certain value. decreased. remains unchanged. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip 3 %. None of these 3.33 %. 0 .001 %. 3 %. None of these 3.33 %. 0 .001 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In shunt dc motor the direction of rotation of the motor will reversed. When only field terminals are changed. either field terminals are reversed or armature terminals are reversed. only armature terminals are reversed. none of above. only field terminals are changed. either field terminals are reversed or armature terminals are reversed. only armature terminals are reversed. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will continue to work as synchronous motor with same direction of rotation. come to stand still. continue to work as alternator but the direction of rotation will reverse. start working as induction motor. continue to work as synchronous motor with same direction of rotation. come to stand still. continue to work as alternator but the direction of rotation will reverse. start working as induction motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements, 1, 2 and 3 are correct 2, 3 and 4 are correct 1 and 4 are correct 1, 2 and 4 are correct 1, 2 and 3 are correct 2, 3 and 4 are correct 1 and 4 are correct 1, 2 and 4 are correct ANSWER DOWNLOAD EXAMIANS APP
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