MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
In which of the following motor, ratio of starting torque to full-load torque will be least? |
| A. | DC series motors |
| B. | DC shunt motors |
| C. | DC compound motors |
| D. | Synchronous motors |
| Answer» C. DC compound motors | |
| 2. |
In a DC shunt motor, what will be the armature current at maximum load? |
| A. | Almost negligible |
| B. | Rated full-load current |
| C. | Less than full-load current |
| D. | More than full-load current |
| Answer» E. | |
| 3. |
Practical reason behind speed of DC shunt motor is proportional to back emf only is ____________ |
| A. | Back emf is equal to armature drop |
| B. | Flux is proportional to field current |
| C. | Flux is proportional to armature current |
| D. | Flux is practically constant in DC shunt motors |
| Answer» E. | |
| 4. |
How speed of the DC shunt motor can be increased? |
| A. | Decreasing the field current |
| B. | Increasing the field current |
| C. | Decreasing the load current |
| D. | Increasing the armature current |
| Answer» C. Decreasing the load current | |
| 5. |
What will be the effect of reducing load on DC shunt motor? |
| A. | Speed will increase abruptly |
| B. | Speed will increase in proportion to reduction in load |
| C. | Speed will remain almost constant |
| D. | Speed will reduce |
| Answer» D. Speed will reduce | |
| 6. |
What will be the effect of opening of field of a DC shunt motor while motor is running? |
| A. | The speed of motor will be reduced |
| B. | The armature current will reduce |
| C. | The motor will attain dangerously high speed |
| D. | The motor will continue to constant speed |
| Answer» D. The motor will continue to constant speed | |
| 7. |
In a DC shunt motor for zero armature current we get speed ______ |
| A. | Non-zero and minimum |
| B. | Zero |
| C. | Non-zero and maximum |
| D. | Doesn’t depend on armature current |
| Answer» D. Doesn’t depend on armature current | |
| 8. |
In a DC shunt motor, speed is related to armature current as _____________ |
| A. | Directly proportional to the armature current |
| B. | Proportional to the square of the current |
| C. | Independent of armature current |
| D. | Inversely proportional to the armature current |
| Answer» E. | |
| 9. |
For machine tools, which DC motor can be used? |
| A. | DC Series motor |
| B. | DC Shunt motor |
| C. | DC cumulative compound motor |
| D. | DC differential compound motor |
| Answer» C. DC cumulative compound motor | |