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AE-JE Foundation EE Electrical Machines Revision Quiz
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Which of the following is not the method of reducing harmonics?
An autotransformer has V1, I1 as input quantities and V2, I2 as output quantities With V2 < V1. The VA transformed from primary to secondary is
A synchronous capacitor is
A 450V, 50 KVA 1-ϕ alternator has an effective armature resistance of 0.62 Ω. An excitation current of 10A produces 200A armature current on short circuit and an emf 400V on open-circuit. Calculate synchronous reactance
Enclosure of motor is made from
A three phase, 4-pole and 50 Hz induction motor have rotor copper loss equal to 400 W. The torque developed by the motor at 5% slip will be.
A 3-phase induction motor has a full-load slip of 3 percent at normal voltage. What will be the value of slip if it develops the same torque theoretically while operating at 110 percent of normal voltage?
For a 3-phase synchronous motor, if air gap is increased, then what will be its effect on voltage regulation?
In case of 3- ϕ IM, shaft power is 2700 W and mechanical losses are 180 W. At a slip of 4%, The rotor ohmic losses will be:
A stepper motor with stator and rotor teeth of 12 and 10 respectively. The value of single step of stepper motor will be:
A 50 kVA, 2200/110V transformer when tested gave S.C. test 90V, 20.5A, 808W (H.V. Side). Calculate the % Voltage regulation at full load with 0.8 p.f. lagging?
Potier triangle method is helpful in obtaining the voltage regulation of synchronous machines by determining the armature
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Aug 2AE & JE Exams
Mohd. IrshadMember since Apr 2020