MCQOPTIONS
Saved Bookmarks
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. |
Which of the following DC motor has negative speed regulation? |
| A. | Shunt motors |
| B. | Series motors |
| C. | Differential compound motors |
| D. | Series and differential compound motors |
| Answer» D. Series and differential compound motors | |
| 2. |
For strong series field, speed-torque characteristic of cumulative compound motor lies __________ |
| A. | Above series motor characteristic if current is less than full load current |
| B. | Above shunt motor characteristic if current is less than full load current |
| C. | Below series motor characteristic if current is more than full load current |
| D. | Below series motor characteristic if current is less than full load current |
| Answer» C. Below series motor characteristic if current is more than full load current | |
| 3. |
Torque-current characteristic of DC cumulative compound motor _____________ |
| A. | Lies above shunt motor characteristic |
| B. | Lies below shunt motor characteristic |
| C. | Lies above of series and shunt motor characteristic both |
| D. | Lies between of series and shunt motor characteristic both |
| Answer» D. Lies between of series and shunt motor characteristic both | |
| 4. |
Torque of the cumulative compound DC motor is _____________ |
| A. | Addition of Ia and Ia<sup>2</sup> term |
| B. | Subtraction of Ia from Ia<sup>2</sup> term |
| C. | Subtraction of Ia<sup>2</sup> from Ia term |
| D. | Addition of -Ia and -Ia<sup>2</sup> term |
| Answer» B. Subtraction of Ia from Ia<sup>2</sup> term | |
| 5. |
Only motor listed below whose speed increases with increase in armature current is ___________ |
| A. | DC series motor |
| B. | DC cumulative compound motor |
| C. | DC shunt motor |
| D. | DC differential compound motor |
| Answer» E. | |
| 6. |
Where speed-current characteristic of DC shunt motor lies with respect to DC cumulative compound motor (assume current smaller than full load current)? |
| A. | Can be represented by same curve |
| B. | Above |
| C. | Below |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 7. |
Where speed-current characteristic of DC shunt motor lies with respect to DC cumulative compound motor (assume current greater than full load current)? |
| A. | Can be represented by same curve |
| B. | Above |
| C. | Below |
| D. | Cannot be determined |
| Answer» C. Below | |
| 8. |
Differential compound motor is used in large number of applications. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Speed current characteristic of cumulative DC compound motor at larger values of armature current is similar to that of _____________ |
| A. | DC shunt motor |
| B. | Induction motor |
| C. | DC differential compound motor |
| D. | DC series motor |
| Answer» E. | |
| 10. |
With increase in armature current, speed of the cumulative compound motor _________ |
| A. | Reduces slowly compare to shunt motor |
| B. | Reduces sharply compare to shunt motor |
| C. | Remains constant |
| D. | Increases in proportionality with armature current |
| Answer» C. Remains constant | |
| 11. |
Net field current in a compound motor is given by ______________ |
| A. | If (net)= I<sub>f</sub> + (N<sub>se</sub>/N<sub>f</sub>) I<sub>a</sub> |
| B. | If (net)= I<sub>f</sub> (N<sub>se</sub>/N<sub>f</sub>) I<sub>a</sub> |
| C. | If (net)= I<sub>f</sub> + (N<sub>f</sub>/N<sub>se</sub>) I<sub>a</sub> |
| D. | If (net)= I<sub>f</sub> (N<sub>f</sub>/N<sub>se</sub>) I<sub>a</sub> |
| Answer» B. If (net)= I<sub>f</sub> (N<sub>se</sub>/N<sub>f</sub>) I<sub>a</sub> | |