The effect of field resistance speed control on a shunt motor speed torque characteristic is?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q4a.png"><img alt="Effect of field resistance speed control on shunt motor speed torque - option a" class="alignnone size-full wp-image-160863" height="205" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q4a.png" width="300"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q4b.png"><img alt="Effect of field resistance speed control on shunt motor speed torque - option b" class="alignnone size-full wp-image-160864" height="198" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q4b.png" width="266"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q4c.png"><img alt="Effect of field resistance speed control on shunt motor speed torque - option c" class="alignnone size-full wp-image-160865" height="209" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q4c.png" width="276"/></a>
• D. none of the mentioned