MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
PMMDC can only be armature controlled. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
A PMMDC motor has an armature resistance of 4.2 ohms. When 6 V supply is applied to motor it runs at 1215 rpm drawing 14.5 mA on no-load. The rotational losses is? |
| A. | 86.1 mW |
| B. | 86.1 W |
| C. | 8.6 W |
| D. | 8.6 mW |
| Answer» B. 86.1 W | |
| 3. |
Mark the speed torque characteristic of the PMDC. |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6a.png"><img alt="The speed torque characteristic of the PMDC - option a" class="alignnone size-full wp-image-160885" height="205" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6a.png" width="300"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6b.png"><img alt="The speed torque characteristic of the PMDC - option b" class="alignnone size-full wp-image-160886" height="198" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6b.png" width="266"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6c.png"><img alt="The speed torque characteristic of the PMDC - option c" class="alignnone size-full wp-image-160887" height="199" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6c.png" width="300"/></a> |
| D. | None of the mentioned |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6b.png"><img alt="The speed torque characteristic of the PMDC - option b" class="alignnone size-full wp-image-160886" height="198" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q6b.png" width="266"/></a> | |
| 4. |
Select the possible dc magnetization characteristics of permanent magnetic materials. |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5a.png"><img alt="DC magnetization characteristics of permanent magnetic materials - option a" class="alignnone size-full wp-image-160881" height="161" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5a.png" width="300"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5b.png"><img alt="DC magnetization characteristics of permanent magnetic materials - option b" class="alignnone size-full wp-image-160882" height="193" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5b.png" width="300"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5c.png"><img alt="DC magnetization characteristics of permanent magnetic materials - option c" class="alignnone size-full wp-image-160883" height="208" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5c.png" width="300"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5d.png"><img alt="DC magnetization characteristics of permanent magnetic materials - option d" class="alignnone size-full wp-image-160884" height="222" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5d.png" width="300"/></a> |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5b.png"><img alt="DC magnetization characteristics of permanent magnetic materials - option b" class="alignnone size-full wp-image-160882" height="193" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-permanent-magnet-dc-pmdc-motors-q5b.png" width="300"/></a> | |
| 5. |
PMMDC are smaller in size due to __________ |
| A. | ansence of field winding |
| B. | presence of smaller field winding |
| C. | present of magnets |
| D. | Any of the mentioned |
| Answer» B. presence of smaller field winding | |
| 6. |
Which type of field winding required in PMMDC? |
| A. | series winding |
| B. | shunt winding |
| C. | cumulative winding |
| D. | none of the mentioned |
| Answer» E. | |
| 7. |
The qualities aspired to obtain a good permanent magnet is/are ____________ |
| A. | high residual flux |
| B. | low coercivity |
| C. | high coercivity |
| D. | high residual flux and high coercivity |
| Answer» E. | |