Electrical Machines Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm 1Ω. 0.23Ω. 0.25Ω. 0.5Ω. 1Ω. 0.23Ω. 0.25Ω. 0.5Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip? 2.5Hz 2HZ 1 Hz 50Hz 2.5Hz 2HZ 1 Hz 50Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines At slip s = 1 torque developed in machine is electromagnetic torque. starting torque. maximum torque. none. electromagnetic torque. starting torque. maximum torque. none. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because dc machines are comparatively low rating machines. it gives more uniform air-gap flux distribution commutator action is not possible otherwise it reduces field structure iron losses dc machines are comparatively low rating machines. it gives more uniform air-gap flux distribution commutator action is not possible otherwise it reduces field structure iron losses ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machine is invariably provided with forced ventilation? Hermetically sealed motor of refrigerator. 50 MW generator in a power plant. Fractional horse power slow speed motor. Fractional horse power high speed motor. Hermetically sealed motor of refrigerator. 50 MW generator in a power plant. Fractional horse power slow speed motor. Fractional horse power high speed motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the starting resistance in the starter. rotor at slip rings. None of these stator phases of the motor. starting resistance in the starter. rotor at slip rings. None of these stator phases of the motor. ANSWER DOWNLOAD EXAMIANS APP
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