MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A dc shunt motor is connected to the source through 3-point starter. Suddenly if we starter handle is moved fastly from off to on position, then the _________ |
| A. | motor will draw large current |
| B. | motor will not start |
| C. | motor will burn |
| D. | all of the mentioned |
| Answer» E. | |
| 2. |
The speed torque of the differential compound dc motor is shown below. What conclusions can be made? |
| A. | This is an unstable machine |
| B. | There is regenerative increment in the speed |
| C. | This is impractical to be used |
| D. | All of the mentioned |
| Answer» E. | |
| 3. |
Choose the best option which identifies about the below characteristics. |
| A. | (1)series motor (2) Cumulative compound motor (3) Shunt motor |
| B. | (1)Cumulative compound motor (2) series motor (3) Shunt motor |
| C. | (1)Cumulative compound motor (2) Shunt motor (3) series motor |
| D. | (1)Shunt motor (2) series motor (3) Cumulative compound motor |
| Answer» B. (1)Cumulative compound motor (2) series motor (3) Shunt motor | |
| 4. |
For a dc shunt motor of 5 kW, running at 1000 rpm, the induced torque will be ____________ |
| A. | 47.76 N |
| B. | 57.76 N |
| C. | 35.76 N |
| D. | 37.76 N |
| Answer» B. 57.76 N | |
| 5. |
A student is given a differential compound motor and he has been asked to make it start. How will he try?$ |
| A. | By shorting series field at start |
| B. | To run as shunt motor at start |
| C. | By making rated current at start |
| D. | All of the mentioned |
| Answer» E. | |
| 6. |
It_is_impossible_to_start_a_differential_compounded_dc_motor.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
A dc shunt motor is connected to the source through 3-point starter. Suddenly if we starter handle is moved fastly from off to on position, then |
| A. | motor will draw large current |
| B. | motor will not start |
| C. | motor will burn |
| D. | all of the mentioned |
| Answer» E. | |
| 8. |
For_a_100_hp_250_V,_compound_dc_motor_with_compensating_winding_has_a_field_current_of_5_A_to_produce_a_voltage_of_250_V_at_1200_rpm._What_will_be_the_shunt_field_current_of_this_machine_at_no_load? |
| A. | 5 A |
| B. | 5.6 A |
| C. | 4 A |
| D. | 0 A |
| Answer» B. 5.6 A | |
| 9. |
It is advised not to run dc series motor with no load. Why? |
| A. | Because zero torque at no load will make speed infinite |
| B. | Because zero torque as no load will not let machine start |
| C. | Because infinite torque will be produced |
| D. | None of the mentioned |
| Answer» B. Because zero torque as no load will not let machine start | |
| 10. |
The flux and the internally generated voltage of a dc machine is a ________ function of its magneto-motive force. |
| A. | non-linear |
| B. | linear |
| C. | constant |
| D. | inverse |
| Answer» B. linear | |
| 11. |
For a dc shunt motor of 5 kW, running at 1000 rpm, the induced torque will be |
| A. | 47.76 N |
| B. | 57.76 N |
| C. | 35.76 N |
| D. | 37.76 N |
| Answer» B. 57.76 N | |
| 12. |
Mark the correct option which affects the terminal voltage of a dc shunt motor. |
| A. | Armature reaction |
| B. | Source voltage variations |
| C. | Compensating winding |
| D. | Any of the mentioned |
| Answer» D. Any of the mentioned | |