MCQOPTIONS
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MCQOPTIONS
This section includes 18 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 type motors are preferred for lathes? |
| A. | DC shunt motors |
| B. | Squirrel Cage induction motor |
| C. | Synchronous motor |
| D. | DC Shunt Motors or Squirrel cage induction motor |
| Answer» E. | |
| 2. |
DC shunt motor is still used instead of synchronous motor in _____________ |
| A. | High speed applications |
| B. | Low speed applications |
| C. | Medium and high-speed applications |
| D. | Everywhere |
| Answer» C. Medium and high-speed applications | |
| 3. |
Which motor has almost replaced DC shunt motor from its applications? |
| A. | Wound-rotor induction motor |
| B. | Differential compound motor |
| C. | Air motor |
| D. | Squirrel caged induction motor |
| Answer» E. | |
| 4. |
WHICH_MOTOR_HAS_ALMOST_REPLACED_DC_SHUNT_MOTOR_FROM_ITS_APPLICATIONS??$ |
| A. | Wound-rotor induction motor |
| B. | Differential compound motor |
| C. | Air motor |
| D. | Squirrel caged induction motor |
| Answer» E. | |
| 5. |
Which type motors are preferred for lathes?$ |
| A. | DC shunt motors |
| B. | Squirrel Cage induction motor |
| C. | Synchronous motor |
| D. | DC Shunt Motors or Squirrel cage induction motor |
| Answer» E. | |
| 6. |
DC_shunt_motor_is_still_used_instead_of_synchronous_motor_in______________$ |
| A. | High speed applications |
| B. | Low speed applications |
| C. | Medium and high-speed applications |
| D. | Everywhere |
| Answer» C. Medium and high-speed applications | |
| 7. |
For which of the following operations a DC motor is preferred over an AC motor? |
| A. | Low speed operation |
| B. | High speed operation |
| C. | Variable speed operation |
| D. | Fixed speed operation |
| Answer» D. Fixed speed operation | |
| 8. |
Which motor is preferred in highly explosive atmosphere? |
| A. | Air motor |
| B. | Shunt motor |
| C. | Series motor |
| D. | Battery operated motor |
| Answer» B. Shunt motor | |
| 9. |
Nowadays, DC motor is widely used only in ____________ |
| A. | Pumping sets |
| B. | Air compressors |
| C. | Electric traction |
| D. | Machine shops |
| Answer» D. Machine shops | |
| 10. |
When an electric train is moving down a hill, the DC motor will operate as ____________ |
| A. | DC series motor |
| B. | DC series generator |
| C. | DC shunt motor |
| D. | DC shunt generator |
| Answer» C. DC shunt motor | |
| 11. |
Which of the following motor can replace DC series motor? |
| A. | DC shunt motor |
| B. | Cumulative compound motor |
| C. | Wound-rotor induction motor |
| D. | Synchronous motor |
| Answer» D. Synchronous motor | |
| 12. |
Maximum torque in a DC machine is limited by ______________ |
| A. | Commutation |
| B. | Heating |
| C. | Losses other than heating |
| D. | Stability |
| Answer» B. Heating | |
| 13. |
In world today, around 25% of the motors are manufactured are DC motors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
Separately excited DC generators are still used in _________________ |
| A. | Thermal power plants |
| B. | Ward Leonard speed control system |
| C. | Hydro power plant |
| D. | In all fields |
| Answer» C. Hydro power plant | |
| 15. |
Which DC motor is used with flywheel for intermittent light and heavy loads? |
| A. | Series motor |
| B. | Shunt motor |
| C. | Cumulatively compounded motor |
| D. | Differentially compounded motor |
| Answer» D. Differentially compounded motor | |
| 16. |
Which of the following motors can be used to drive the rotary compressor? |
| A. | DC shunt motor |
| B. | DC series motor |
| C. | Universal motor |
| D. | Synchronous motor |
| Answer» E. | |
| 17. |
Which of the following load application normally needs starting torque more than the rated torque? |
| A. | Blowers |
| B. | Conveyors |
| C. | Air compressors |
| D. | Centrifugal pumps |
| Answer» C. Air compressors | |
| 18. |
Why are the DC motors preferred for traction applications? |
| A. | Torque and speed are inversely proportional to armature current |
| B. | Torque is proportional to armature current |
| C. | Torque is proportional to square root of armature current |
| D. | The speed is inversely proportional to the torque and the torque is proportional to square of armature current |
| Answer» E. | |