engineering recuitment Indian Coast Guard Yantrik Mock Test 2024 Electrical Machines DC Motor DC Motor Speed Regulation
A 200 V DC machine when operating as a generator, then induced emf is given by 'Eg'. Now the same machine is operating as a motor, then back emf is given by 'Eb'. Determine the ratio of motor speed (Nm) to the generator speed (Ng)? (Assume that flux per pole remains constant in both operations)
1
\(\frac{{{N_m}}}{N_g} = 1\)
2
\(\frac{{{N_m}}}{N_g} = \frac{{{1}}}{2}\)
3
\(\frac{{{N_m}}}{N_g} = \frac{{{E_b}}}{E_g}\)
4
\(\frac{{{N_m}}}{N_g} = \frac{{{E_g}}}{E_b}\)