MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
When coil sides are pole pitch apart, the DC armature winding is called as ___________ |
| A. | Multiplex |
| B. | Fractional-pitch |
| C. | Full-pitch |
| D. | Pole-pitch |
| Answer» D. Pole-pitch | |
| 2. |
For a 2-pole DC machine with coil span equal to 6, what are the number of commutator segments? |
| A. | 3 |
| B. | 12 |
| C. | 4 |
| D. | 8 |
| Answer» C. 4 | |
| 3. |
What is the nature of the coils when YCS value is non-integral? |
| A. | Long-pitched |
| B. | Medium-pitched |
| C. | Short-pitched |
| D. | Can’t be determined by YCS value |
| Answer» D. Can’t be determined by YCS value | |
| 4. |
FOR_A_2-POLE_DC_MACHINE_WITH_COIL_SPAN_EQUAL_TO_6,_WHAT_ARE_THE_NUMBER_OF_COMMUTATOR_SEGMENTS??$ |
| A. | 3 |
| B. | 12 |
| C. | 4 |
| D. | 8 |
| Answer» C. 4 | |
| 5. |
When coil sides are pole pitch apart, the DC armature winding is called as ___________$ |
| A. | Multiplex |
| B. | Fractional-pitch |
| C. | Full-pitch |
| D. | Pole-pitch |
| Answer» D. Pole-pitch | |
| 6. |
What is the nature of the coils when YCS value is non-integral? |
| A. | Long-pitched |
| B. | Medium-pitched |
| C. | Short-pitched |
| D. | Can’t be determined by Y<sub>CS</sub> value |
| Answer» D. Can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be determined by Y<sub>CS</sub> value | |
| 7. |
Coil span for 4-pole, 12-slot armature winding is_______ |
| A. | 24 |
| B. | 48 |
| C. | 8 |
| D. | 3 |
| Answer» E. | |
| 8. |
As the armature rotates, the number of coils in series tapped by the brush pairs_________ |
| A. | Remains same |
| B. | Increases |
| C. | Decreases |
| D. | Depends on rotor speed and direction of torque |
| Answer» B. Increases | |
| 9. |
What is the effect of armature coils at points where brushes are located? |
| A. | Induces positive emf |
| B. | Induces negative emf |
| C. | Induces zero emf |
| D. | Depends on the speed of rotor |
| Answer» D. Depends on the speed of rotor | |
| 10. |
What is the difference of DC voltages in the adjoining Brushes? |
| A. | Depends on the Shaft speed |
| B. | Zero |
| C. | Non-zero |
| D. | Depends on the various other parameters |
| Answer» C. Non-zero | |
| 11. |
Commutator performs rectification so that output of the machine is unidirectional. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
In a DC machine, how coil-side emf varies towards the outer side of poles? |
| A. | Decreases |
| B. | Remains same |
| C. | Increases |
| D. | First increases the decreases |
| Answer» B. Remains same | |
| 13. |
Armature winding is mounted on a __________ |
| A. | Stator |
| B. | Rotor |
| C. | Can be mounted anywhere on stator or rotor |
| D. | Not required |
| Answer» C. Can be mounted anywhere on stator or rotor | |