Electrical Machines The sparking at the the brushes, in a DC machines is due to high resistance of carbon brushes. reactance voltage. armature reaction. presence of commutator. high resistance of carbon brushes. reactance voltage. armature reaction. presence of commutator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will not start automatically. start automatically without trouble. develop very low starting torque. get damaged. not start automatically. start automatically without trouble. develop very low starting torque. get damaged. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The condition for maximum running torque is zero unity 0.707 lagging 0.5 lagging R = S.X zero unity 0.707 lagging 0.5 lagging R = S.X ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines On which of the following factor/factors the speed of a DC motor depends upon? All of these. Armature current. Applied voltage. Field flux. All of these. Armature current. Applied voltage. Field flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient? 1.5. 1.2. 1.4. 1.8. 1.5. 1.2. 1.4. 1.8. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb. 10 volts. 30 volts. 40 volts. 20 volts. 10 volts. 30 volts. 40 volts. 20 volts. ANSWER DOWNLOAD EXAMIANS APP
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