Wednesday, 27 March 2019

Electrical Engineering Objective Questions And Answers Free Download

Electrical Engineering Objective Questions And Answers Free Download






1. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on


(a) running winding

(b) rotor winding

(c) field winding

(d) compensating winding


Ans: a






2. Which of the following statements regarding repulsion-start induction motor is incorrect ?

(a) It requires more maintenance of commutator and other mechanical devices

(b) It makes quite a bit of noise on starting

(c) In fractional horse power motors, it has replaced the capacitor motors

(d) It is not easily reversed


Ans: c






3. A.C. series motor as compared to D.C. series motor has

(a) smaller brush width

(b) less number of field turns

(c) more number of armature turns

(d) less air gap

(e) all of the above


Ans: e






4. Locked rotor current of a shaded pole motor is

(a) equal to full load current

(b) less than full load current

(c) slightly more than full load current

(d) several times the full load current


Ans: c






5. Speed control of a universal motor is achieved by

(a) varying field flux with tapped field windings

(b) connecting rheostat in series

(c) applying variable voltage by means of silicon controlled rectifier

(d) applying variable voltage by means of variable auto-transformer

(e) all of the above methods


Ans: e


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