MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
ARMATURE_WINDING_IS_ONE_IN_WHICH_WORKING____________?$ |
| A. | flux is produced by field current |
| B. | flux is produced by the working emf |
| C. | emf is produced by the working flux |
| D. | emf is produced by the leakage flux |
| Answer» D. emf is produced by the leakage flux | |
| 2. |
Why_is_the_air_gap_between_stator_and_rotor_should_be_kept_as_small_as_mechanically_possible_in_induction_motor?$ |
| A. | to reduce the leakage flux between stator and rotor |
| B. | as it leads to better operating power factor of the induction motor |
| C. | reduce the eddy current losses |
| D. | both, to reduce leakage flux between stator and rotor, and also for better operating power factor |
| Answer» E. | |
| 3. |
What is the reason behind armature structure for both DC and AC machines being laminated? |
| A. | reduce i<sup>2</sup>R losses |
| B. | reduce the leakage flux |
| C. | reduce the eddy current losses |
| D. | for better operating power factor |
| Answer» D. for better operating power factor | |
| 4. |
The power rating of the field winding is ___________ |
| A. | equal to the power rating of the machine |
| B. | 1/2 to 2% of the rated power of the machine |
| C. | greater than the power rating of the machine |
| D. | less than the power rating of the machine |
| Answer» C. greater than the power rating of the machine | |
| 5. |
The rating of the armature winding is ___________ |
| A. | 1/2 to 2% of the rated power of the machine |
| B. | less than the power rating of the machine |
| C. | greater than the power rating of the machine |
| D. | equal to the power rating of the machine |
| Answer» E. | |
| 6. |
Current in the field winding is ___________ |
| A. | AC always |
| B. | DC always |
| C. | Both AC and DC |
| D. | Either AC or DC |
| Answer» C. Both AC and DC | |
| 7. |
Which of the following statements are correct regarding exciting current? |
| A. | exciting current varies with the load |
| B. | exciting current doesn’t vary with load |
| C. | exciting current produces only a working magnetic flux |
| D. | exciting current is not responsible for the production of working magnetic flux |
| Answer» D. exciting current is not responsible for the production of working magnetic flux | |
| 8. |
Armature winding carries which of the following current? |
| A. | magnetizing current only |
| B. | load current only |
| C. | both magnetizing current and load current |
| D. | none of the mentioned |
| Answer» C. both magnetizing current and load current | |
| 9. |
Which of the following two windings produces/induces the working flux and working EMF respectively? |
| A. | field winding and armature winding |
| B. | armature winding and field winding |
| C. | both are produced in field winding |
| D. | both are produced in armature winding |
| Answer» B. armature winding and field winding | |