Electrical Engineering Interview Question:

With a star-delta starter, the windings are brought out to a terminal box. The voltage applied to the windings at starting is

Submitted by: Administrator

* a) VL ÷ v3
* b) VL x v3
* c) VPhase ÷ v3
* d) VPhase x v3

Answer - a
Submitted by: Administrator

lets, understand like this, star -delta starter employing motor runs at 415v (phase voltage) but at starting it starts on 415/v3=240v (Line Voltage). Hence answer is VPhase/v3 , option C.
Submitted by: Parmanand Kumar Patel