Question

Calculate the moment of inertia of the satellite having a mass of 79 kg and diameter of 83 cm.

(a) 13.65 kgm^2

(b) 13.60 kgm^2

(c) 12.67 kgm^2

(d) 13.82 kgm^2

I have been asked this question in final exam.

This interesting question is from Speed Control of Series Motor topic in chapter Speed Control of Direct Current Motors & Induction Motors of Electric Drives

Answer 1

The correct answer is (b) 13.60 kgm^2

For explanation: The moment of inertia of the satellite can be calculated using the formula I=mr^2. The mass of the satellite and diameter is given. I=(79)×(.415)^2=13.60 kgm^2. It depends upon the orientation of the rotational axis.