Wednesday, 27 March 2019

Electrical Engineering Technical Questions | Basic Electrical Viva Questions

Electrical Engineering Technical Questions | Basic Electrical Viva Questions





1. To reverse the direction of rotation of acapacitor start motor while it is running we should

(a) disconnect motor from the supply till it stops then reconnect it to supply withvreversed connection of main or auxiliary winding

(b) disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding

(c) reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

(d) reverse the direction of connections of the auxiliary winding and immediately connect it to supply


Ans: a





2. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will

(a) become unstable

(b) draw excessive armature current and may burn out

(c) fall out of synchronism and come to stand still

(d) run as induction motor


Ans: d





3. Which of the following motors has two separate windings on the motor ?

(a) Repulsion motor

(b) Repulsion induction motor

(c) Repulsion start induction run motor

(d) None of the above


Ans: b





4. A shaded pole motor does not possess

(a) centrifugal switch

(b) capacitor

(c) commutator

(d) all of the above


Ans: d






5. In a A.C. series motor armature coils are usually connected to commutator

(a) through resistance

(b) through reactances

(c) through capacitors

(d) solidly


Ans: a




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