Question

Calculate the moment of inertia of the disc having a mass of 4 kg and diameter of 1458 cm.

(a) 106.288 kgm^2

(b) 104.589 kgm^2

(c) 105.487 kgm^2

(d) 107.018 kgm^2

I had been asked this question in an interview.

I'm obligated to ask this question of Methods of Starting Electric Motors topic in division Starting of Electric Drives

Answer 1

The correct option is (a) 106.288 kgm^2

The best explanation: The moment of inertia of the disc can be calculated using the formula I=mr^2×.5. The mass of the disc and diameter is given. I=(4)×.5×(7.29)^2=106.288 kgm^2. It depends upon the orientation of the rotational axis.