Electrical Machines In travelling cranes for crane travel, trolley and boom hoist which motor is preferred? Synchronous motor. DC differential compound motor. Stepper motor. Slip ring induction motor. Synchronous motor. DC differential compound motor. Stepper motor. Slip ring induction motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Capacitor fitted with ceiling / table fans is of the value of 0.1 µF. 2 - 3 µF. 1 - 2 µF. 5 - 10 F. 0.1 µF. 2 - 3 µF. 1 - 2 µF. 5 - 10 F. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be 50. 18. 36. 80. 50. 18. 36. 80. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Copper brushes in DC machine are used where low voltage and high currents are involved. None of these where high voltage and low current. in both of above cases. where low voltage and high currents are involved. None of these where high voltage and low current. in both of above cases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is 230 V. 460 V. 115 V. 200 V. 230 V. 460 V. 115 V. 200 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Short circuiting is caused in the armature winding due to grounding of two or more turns of the same coil. failure of insulation between two turns of coil. any of above. failure of insulation between two commutator bars. grounding of two or more turns of the same coil. failure of insulation between two turns of coil. any of above. failure of insulation between two commutator bars. ANSWER DOWNLOAD EXAMIANS APP
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