Electrical Machines The synchronous speed of an induction motor will be increased by decreasing of frequency. increasing of frequency. increasing number of poles. speed can not be increased. decreasing of frequency. increasing of frequency. increasing number of poles. speed can not be increased. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor must started on no load because it would Draw more current without producing sufficient torque. Fail to start without load. Not develop starting torque. Run at dangerously high speed. Draw more current without producing sufficient torque. Fail to start without load. Not develop starting torque. Run at dangerously high speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Commutation in a DC machine may be explained as a process by virtue of which emf is induced in the armature conductors. how alternate flux affects the main field flux. by which electric current in a coil is reversed. in which magnetic field is set up. by virtue of which emf is induced in the armature conductors. how alternate flux affects the main field flux. by which electric current in a coil is reversed. in which magnetic field is set up. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When two DC series motors are connected in parallel, the resultant speed is zero. normal speed. more than normal speed. less than normal speed. zero. normal speed. more than normal speed. less than normal speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is 1, 4 2, 4 1, 3 2, 3 1, 4 2, 4 1, 3 2, 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp? 15 N. None of these. 20 N. Can't be determined. 15 N. None of these. 20 N. Can't be determined. ANSWER DOWNLOAD EXAMIANS APP
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