MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
DC motor is to a drive a load which is almost zero for certain part of the load cycle and peak value for short duration. We will select __________ |
| A. | Series motor |
| B. | Shunt motor |
| C. | Compound motor |
| D. | Any DC motors |
| Answer» D. Any DC motors | |
| 2. |
What will happen if the series field of a cumulative compound motor is short circuited? |
| A. | Net flux will increase |
| B. | Speed will increase |
| C. | Speed will remain constant |
| D. | Speed will decrease |
| Answer» C. Speed will remain constant | |
| 3. |
What will happen if the series field of a differential compound motor is short circuited? |
| A. | Net flux will decrease |
| B. | Speed will increase |
| C. | Speed will remain constant |
| D. | Speed will decrease |
| Answer» E. | |
| 4. |
What will happen if shunt field suddenly opens, in a differential compound DC motor? |
| A. | Motor will first stop and then run in opposite direction as series motor |
| B. | Motor will not work and come to stop |
| C. | Motor will work as series motor and run at infinitely high speed |
| D. | Motor will work as series motor and run at slow speed |
| Answer» B. Motor will not work and come to stop | |
| 5. |
Flywheel is used with DC compound motor to reduce the peak demand by the motor, compound motor has to be _____________ |
| A. | Level compounded |
| B. | Under compounded |
| C. | Cumulatively compounded |
| D. | Differentially compounded |
| Answer» D. Differentially compounded | |
| 6. |
Unlike DC series motor, DC compound motor can be started on no-load. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
For the same H.P. rating and full load speed, which of the following motor has poor starting torque? |
| A. | Series motor |
| B. | Shunt motor |
| C. | Cumulative compound motor |
| D. | Differential compound motor |
| Answer» E. | |
| 8. |
Which DC motor has got maximum self-loading property? |
| A. | Series motor |
| B. | Shunt motor |
| C. | Cumulative compound motor |
| D. | Differential compound motor |
| Answer» E. | |
| 9. |
Which DC motor is used in shears and punches? |
| A. | Shunt motor |
| B. | Series motor |
| C. | Cumulative compound motor |
| D. | Differential compound motor |
| Answer» D. Differential compound motor | |
| 10. |
Which DC motor is more preferred for elevators? |
| A. | Shunt motor |
| B. | Series motor |
| C. | Differential compound motor |
| D. | Cumulative compound motor |
| Answer» E. | |
| 11. |
Differentially compound DC motors are used in applications requiring _______ |
| A. | High starting torque |
| B. | Low starting torque |
| C. | Variable speed |
| D. | Frequent on-off cycles |
| Answer» C. Variable speed | |