MCQOPTIONS
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MCQOPTIONS
This section includes 18 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 3-phase synchronous alternator is connected to the infinite bus is over excited, that corresponds to ______________ |
| A. | capacitor |
| B. | inductor |
| C. | variable inductor |
| D. | any of the mentioned |
| Answer» B. inductor | |
| 2. |
An alternator is to be used for generation purpose in an aircraft. The most suited operating frequency of the alternator should be ____________ |
| A. | of 400 Hz to remove extra bulk |
| B. | of 400 Hz to reduce losses |
| C. | of 50 Hz to remove extra bulk |
| D. | none of the mentioned |
| Answer» B. of 400 Hz to reduce losses | |
| 3. |
In a single phase induction regulator, the voltage boost is maximum when armature mmf and rotor mmf make an angle of ____________ |
| A. | zero degrees |
| B. | 45 degrees |
| C. | 90 degrees |
| D. | 180 degrees |
| Answer» B. 45 degrees | |
| 4. |
If it asked by the customer to provide tappings on the transformer, the most efficient and economical way to provide it at ____________ |
| A. | middle of hv winding |
| B. | phase end of hv winding |
| C. | neutral end of hv winding |
| D. | middle of lv winding |
| Answer» B. phase end of hv winding | |
| 5. |
The dc series generator is employed as ____________ |
| A. | a booster to maintain constant voltage at the end of the feeder |
| B. | for supplying traction load |
| C. | for battery bank charging |
| D. | none of the mentioned |
| Answer» B. for supplying traction load | |
| 6. |
The most widely used application of ac series motor is ____________ |
| A. | electric traction upto 1600 kW |
| B. | paper mills |
| C. | welding |
| D. | none of the mentioned |
| Answer» E. | |
| 7. |
Synchronous-induction coupled motors are required for ____________ |
| A. | high starting torque applications |
| B. | high pull out torque applications |
| C. | high running torques applications |
| D. | none of the mentioned |
| Answer» B. high pull out torque applications | |
| 8. |
IN_A_SINGLE_PHASE_INDUCTION_REGULATOR,_THE_VOLTAGE_BOOST_IS_MAXIMUM_WHEN_ARMATURE_MMF_AND_ROTOR_MMF_MAKE_AN_ANGLE_OF?$ |
| A. | zero degrees |
| B. | 45 degrees |
| C. | 90 degrees |
| D. | 180 degrees |
| Answer» B. 45 degrees | |
| 9. |
A 3-phase synchronous alternator is connected to the infinite bus is over excited, which corresponds to$ |
| A. | capacitor |
| B. | inductor |
| C. | variable inductor |
| D. | any of the mentioned |
| Answer» B. inductor | |
| 10. |
An_alternator_is_to_be_used_for_generation_purpose_in_an_aircraft._The_most_suited_operating_frequency_of_the_alternator_should_be$ |
| A. | of 400 Hz to remove extra bulk |
| B. | of 400 Hz to reduce losses |
| C. | of 50 Hz to remove extra bulk |
| D. | none of the mentioned |
| Answer» B. of 400 Hz to reduce losses | |
| 11. |
If it asked by the customer to provide tappings on the transformer, the most efficient and economical way to provide it a? |
| A. | middle of hv winding |
| B. | phase end of hv winding |
| C. | neutral end of hv winding |
| D. | middle of lv winding |
| Answer» B. phase end of hv winding | |
| 12. |
The dc series generator is employed as |
| A. | a booster to maintain constant voltage at the end of the feeder. |
| B. | for supplying traction load |
| C. | for battery bank charging |
| D. | none of the mentioned |
| Answer» B. for supplying traction load | |
| 13. |
_______ generator is used in arc welding purposes. |
| A. | Differential compound dc |
| B. | Dc series |
| C. | Cumulative compounded dc |
| D. | Shunt |
| Answer» B. Dc series | |
| 14. |
Universal motor is used in vacuum cleaners, table fans and portable drilling machine. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
The most widely used application of ac series motor is |
| A. | electric traction upto 1600 kW |
| B. | paper mills |
| C. | welding |
| D. | none of the mentioned |
| Answer» E. | |
| 16. |
A synchronous motor absorbing 60 kW is connected in parallel with an continuous load of 240 kW operating at 0.8 power factor lag.What is the kVAR supplied by the synchronous motor to obtain a total power factor of 0.9 lagging? |
| A. | 35, leading |
| B. | 35, lagging |
| C. | 145, leading |
| D. | None of the mentioned |
| Answer» B. 35, lagging | |
| 17. |
Which of the following can be used for braking purposes in electric trains? |
| A. | Induction generator |
| B. | Induction motor |
| C. | Dc series motor |
| D. | Dc differentially compounded generator |
| Answer» B. Induction motor | |
| 18. |
Synchronous-induction coupled motors are required for |
| A. | high starting torque applications |
| B. | high pull out torque applications |
| C. | high running torques applications |
| D. | none of the mentioned |
| Answer» B. high pull out torque applications | |