Electrical Engineering QUESTIONS

Exam NameElectrical Engineering QUESTIONS
DescriptionElectrical Engineering QUESTIONS and Answers exams contains the questions from various competitive exams.These questions are the part of previous year paper.These kind of questions would be helpful in preparing for exams like IAS, PCS, UPSC, NDA, CDS SSC, RRB, PSC, IBPS

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Question: stepped core is used in transformers in order to reduce.

Answer:volume of copper

Question: commutation conditions at full load for large DC machines can be effciently checked by the

Answer:Hopkinson's test

Question: The emf induced in a DC shunt generator is 230 V. The armature resistance is 0.1 Q. If the armature current is 200 A, the terminal voltage will be

Answer:210 V

Question: The commutator of a DC generator acts as

Answer:a rectifier

Question: Fleming's left hand rule is applicable to

Answer:DC motor

Question: which of the following single phase motors is available with speed as low as one revolution per minute ?

Answer:shaded pole

Question: A vacuum cleaner employs_______motor.

Answer:single phase series

Question: In capacitor start single phase induction motor, the current in the

Answer:starting winding leads the voltage

Question: In a single phase induction motor, speed sensitive centrifugal switch is connected in _________winding.

Answer:series with starting

Question: At starting, the current through the starting winding (Is) of single phase induction motor

Answer:is nearly in phase with 'V'

Question: in a single phase induction motor at start, the two revolving feilds produce

Answer:equal and opposite torques in the rotor conductors

Question: A synchronous motor can be used as synchronous condenser when it is

Answer:over excited

Question: Which one of the following methods would give a higher than actual value of regulation of an alternator ?

Answer:EMF method

Question: If the excitation of an alternator operating in parallel with other alternator is increased above the normal value of excitation, its

Answer:power factor becomes more lagging

Question: In an alternator, the effect of armature reaction is minimum at power factor of


Question: damper winding in synchronous motors is used to

Answer:suppress hunting

Question: turbo alternators have rotors of

Answer:small diameter and long axial length

Question: Which of the following equipments is used to limit short-circuit current level in sub-station ?

Answer:Series reactor

Question: Power distribution by cable is generally adopted for line length

Answer:less than 10 km

Question: The leakage resistance of a 50 km long cable is 1 MO. For a 100 km long cable it will be

Answer:0.5 MO