MCQOPTIONS
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MCQOPTIONS
This section includes 61 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
PMMDC are smaller in size due to __________ |
| A. | ansence of field winding |
| B. | presence of smaller field winding |
| C. | present of magnets |
| D. | Any of the mentioned |
| Answer» B. presence of smaller field winding | |
| 52. |
Which type of field winding required in PMMDC? |
| A. | series winding |
| B. | shunt winding |
| C. | cumulative winding |
| D. | none of the mentioned |
| Answer» E. | |
| 53. |
The qualities aspired to obtain a good permanent magnet is/are ____________ |
| A. | high residual flux |
| B. | low coercivity |
| C. | high coercivity |
| D. | high residual flux and high coercivity |
| Answer» E. | |
| 54. |
PMMDC_CAN_ONLY_BE_ARMATURE_CONTROLLED.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 55. |
A_PMMDC_MOTOR_HAS_AS_ARMATURE_RESISTANCE_OF_4.2_OHMS._WHEN_6_V_SUPPLY_IS_APPLIED_TO_MOTOR_IT_RUNS_AT_1215_RPM_DRAWING_14.5_MA_ON_NO-LOAD._THE_ROTATIONAL_LOSSES_IS?$ |
| A. | 86.1 mW |
| B. | 86.1 W |
| C. | 8.6 W |
| D. | 8.6 mW |
| Answer» B. 86.1 W | |
| 56. |
How to manage run-away issue for dc shunt motor in industry? |
| A. | By using PMDC motor |
| B. | By using constant field motors |
| C. | This can not be avoided |
| D. | None of the mentioned |
| Answer» B. By using constant field motors | |
| 57. |
PMDC had no ________ excited machine. |
| A. | electrically |
| B. | magnetically |
| C. | none of the mentioned |
| D. | least |
| Answer» B. magnetically | |
| 58. |
PMMDC offers ______ characteristics. |
| A. | shunt |
| B. | series |
| C. | armature |
| D. | cumulative |
| Answer» B. series | |
| 59. |
PMMDC are smaller in size due to |
| A. | ansence of field winding |
| B. | presence of smaller field winding |
| C. | present of magnets |
| D. | Any of the mentioned |
| Answer» B. presence of smaller field winding | |
| 60. |
The type of field winding required in PMMDC is |
| A. | series winding |
| B. | shunt winding |
| C. | cumulative winding |
| D. | None of the mentioned |
| Answer» E. | |
| 61. |
The qualities aspired to obtain a good permanent magnet is/are |
| A. | high residual flux |
| B. | low coercivity |
| C. | high coercivity |
| D. | high residual flux and high coercivity |
| Answer» E. | |