Electrical Machines What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000. 20 volts. 10 volts. 30 volts. 40 volts. 20 volts. 10 volts. 30 volts. 40 volts. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is Fmax. (3/2)Fmax. 3Fmax. (1/2)Fmax. Fmax. (3/2)Fmax. 3Fmax. (1/2)Fmax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V curve of synchronous motor shows variation of power factor and DC excitation at constant load. power factor and supply voltage during hunting. supply voltage and field current at constant excitation. supply voltage and excitation current at constant load. power factor and DC excitation at constant load. power factor and supply voltage during hunting. supply voltage and field current at constant excitation. supply voltage and excitation current at constant load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the DC Motor use flywheel? Differently compared motor. Cumulatively compound motor. Series motor. Shunt motor. Differently compared motor. Cumulatively compound motor. Series motor. Shunt motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of DC shunt motor if load is reduced The speed will increase abruptly. The speed will remains almost constant. DC Shunt Motor The speed will increase in proportion to reduction in load. The speed will increase abruptly. The speed will remains almost constant. DC Shunt Motor The speed will increase in proportion to reduction in load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC machine, for the same value of Æ, Z and N; which one of the following statements is correct? Armature emf depends on weather the machine is running as a motor or generator. Armature emf is less with wave winding than with lap winding. Armature emf is same as long as the flux density in the air gap remains the same. Armature emf is more with wave winding than with lap winding. Armature emf depends on weather the machine is running as a motor or generator. Armature emf is less with wave winding than with lap winding. Armature emf is same as long as the flux density in the air gap remains the same. Armature emf is more with wave winding than with lap winding. ANSWER DOWNLOAD EXAMIANS APP
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