Consider a 3-phase alternator with negligible armature resistance and high rotational inertia delivering power to an isolated load when the armature terminals got short circuited. After sometime, the mechanical power input to the shaft of the machine is terminated at time t0. The short-circuit current circulating in the armature will change till the machine comes to halt at ts . Which one of the curves depicts this phenomena?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14a.png"><img alt="3-phase alternator with armature resistance &amp; high rotational inertia - option a" class="alignnone size-full wp-image-160968" height="243" sizes="(max-width: 300px) 100vw, 300px" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14a.png 300w, https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14a-100x80.png 100w" width="300"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14b.png"><img alt="3-phase alternator with armature resistance &amp; high rotational inertia - option b" class="alignnone size-full wp-image-160969" height="219" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14b.png" width="279"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14c.png"><img alt="3-phase alternator with armature resistance &amp; high rotational inertia - option c" class="alignnone size-full wp-image-160970" height="227" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14c.png" width="265"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14d.png"><img alt="3-phase alternator with armature resistance &amp; high rotational inertia - option d" class="alignnone size-full wp-image-160971" height="222" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-measurement-xd-xq-q14d.png" width="238"/></a>