MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Dc Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following starter can sufficiently start the DC series motor? |
| A. | 3-point starter |
| B. | 4-point starter |
| C. | 2-point starter |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 2. |
Which of the following is the correct formula for calculating step resistance? |
| A. | = r<sub>n</sub>/r<sub>n-1</sub> |
| B. | = r<sub>n</sub>/r<sub>n+1</sub> |
| C. | = r<sub>n</sub>*r<sub>n-1</sub> |
| D. | = r<sub>n</sub>*r<sub>n+1</sub> |
| Answer» B. = r<sub>n</sub>/r<sub>n+1</sub> | |
| 3. |
For a certain machine having = 1.8, we are using starter with 5 steps. What will be the resistance at step 3 if step 2 resistance is equal to 2 ? |
| A. | 2.111 |
| B. | 1.111 |
| C. | 3.6 |
| D. | 10.8 |
| Answer» C. 3.6 | |
| 4. |
Maximum allowable current for a 240-V DC shunt motor is equal to 65 A. Minimum allowable current for same is equal to 40 A. What will be the value of ? |
| A. | 0.6153 |
| B. | 1.265 |
| C. | 1.625 |
| D. | 2.652 |
| Answer» D. 2.652 | |
| 5. |
What will be the value for starter taking 4 steps, where ratio of resistance at maximum allowable current to armature resistance is equal to 1.8? |
| A. | 1.2164 |
| B. | 1.8 |
| C. | 2.2468 |
| D. | 0.8220 |
| Answer» B. 1.8 | |
| 6. |
In three-point starter, as a starting handle is rotated __________ |
| A. | The resistance is added into armature circuit |
| B. | The resistance is removed from field circuit |
| C. | The resistance is added into field circuit |
| D. | Resistance is neither added nor removed |
| Answer» D. Resistance is neither added nor removed | |