Question

Phase angle can be made 90 degrees using ____________

(a) lead circuit

(b) lag circuit

(c) special design

(d) transformer

I got this question by my school principal while I was bunking the class.

I'm obligated to ask this question of Lag Adjustment Devices topic in section Measurement of Power and Related Parameters of Electrical Measurements

Answer 1

Correct answer is (c) special design

Easiest explanation: Phase angle in an energy meter can be made approximately 90 degrees by making use of a special design in the energy meter.