Electrical Machines In dc machines, the space distribution of air-gap flux density wave at no load is co- sinusoidal sinusoidal rectangular flat-topped co- sinusoidal sinusoidal rectangular flat-topped ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt. 320 Amp. 800 Amp. 0.5 Amp. 400 Amp. 320 Amp. 800 Amp. 0.5 Amp. 400 Amp. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The maximum power developed in cylindrical synchronous machine is occurs at a load angle of 0o. 90o. Greater than 90o. less than 90o. 0o. 90o. Greater than 90o. less than 90o. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Transformer action requires a constant magnetic flux. alternating magnetic lux. alternating electric flux. increasing magnetic flux. constant magnetic flux. alternating magnetic lux. alternating electric flux. increasing magnetic flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will not change and remain at 220 V increase to value lying between 220 V and 1.25 times 220 V increase to 1.25 times 220 V increase to a value greater than 1.25 times 220 V not change and remain at 220 V increase to value lying between 220 V and 1.25 times 220 V increase to 1.25 times 220 V increase to a value greater than 1.25 times 220 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because field resistance was higher than critical resistance field winding was wrongly connected there was a break in the armature circuit there was no residual magnetism in the field circuit field resistance was higher than critical resistance field winding was wrongly connected there was a break in the armature circuit there was no residual magnetism in the field circuit ANSWER DOWNLOAD EXAMIANS APP
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