MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 22 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. |
The reactive power flow is outward from an alternator, then the alternator works at ____________ |
| A. | lagging power factor |
| B. | leading power factor |
| C. | zero power factor |
| D. | normal power factor |
| Answer» B. leading power factor | |
| 2. |
The reactive power flow is outward from an alternator, then it is ____________ |
| A. | over excited |
| B. | under excited |
| C. | critically excited |
| D. | none of the mentioned |
| Answer» B. under excited | |
| 3. |
Reactive power is a matter of interest at ____________ |
| A. | output terminals of generator |
| B. | input terminal of motor |
| C. | output terminals of generator and input terminal of motor |
| D. | none of the mentioned |
| Answer» B. input terminal of motor | |
| 4. |
For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at ____________ |
| A. | Leading |
| B. | Lagging |
| C. | Upf |
| D. | ZpfView Answer |
| Answer» C. Upf | |
| 5. |
For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at ____________ a) Leadingb) Laggingc) Upfd) ZpfView Answer |
| A. | Leadingb) Laggingc) Upfd) ZpfView Answer a) Leading |
| B. | Laggingc) Upfd) ZpfView Answer a) Leadingb) Lagging |
| C. | Upfd) ZpfView Answer a) Leadingb) Laggingc) Upf |
| D. | ZpfView Answer a) Leadingb) Laggingc) Upfd) ZpfView Answer |
| Answer» B. Laggingc) Upfd) ZpfView Answer a) Leadingb) Lagging | |
| 6. |
For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.5 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor? |
| A. | Leading |
| B. | Lagging |
| C. | Upf |
| D. | Zpf |
| Answer» C. Upf | |
| 7. |
For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor? |
| A. | Leading |
| B. | Lagging |
| C. | Upf |
| D. | Zpf |
| Answer» B. Lagging | |
| 8. |
For an alternator, the specified load angle should be _________ for an impedance angle of ‘θ’. |
| A. | δ=θ |
| B. | δ=90-θ |
| C. | δ=90+θ |
| D. | δ=-θ |
| Answer» B. δ=90-θ | |
| 9. |
The condition for maximum power output for an alternator having its load impedance as (2+j) ohms is? |
| A. | 26.56° |
| B. | 63.43° |
| C. | 90° |
| D. | 116.56° |
| Answer» B. 63.43° | |
| 10. |
FOR_A_3_PHASE_SYNCHRONOUS_GENERATOR_OF_TERMINAL_VOLTAGE_AS_1_PU_AND_FIELD_EXCITATION_OF_1.5_PU._IF_THE_RESISTIVE_DROP_IS_0.2_PV,_THEN_WHAT_CAN_BE_CONCLUDED_FOR_POWER_FACTOR??$ |
| A. | Leading |
| B. | Lagging |
| C. | Upf |
| D. | Zpf |
| Answer» C. Upf | |
| 11. |
For a three phase synchronous motor, if the following condition is satisfied, it can be said that it is operating at$ |
| A. | |
| B. | Leading |
| C. | Lagging |
| Answer» D. | |
| 12. |
The reactive power flow is outward from an alternator, then the alternator works at |
| A. | lagging power factor |
| B. | leading power factor |
| C. | zero power factor |
| D. | normal power factor |
| Answer» B. leading power factor | |
| 13. |
The reactive power flow is outward from an alternator, then it is |
| A. | over excited |
| B. | under excited |
| C. | critically excited |
| D. | none of the mentioned |
| Answer» B. under excited | |
| 14. |
Reactive power is a matter of interest at |
| A. | output terminals of generator |
| B. | input terminal of motor |
| C. | output terminals of generator and input terminal of motor |
| D. | none of the mentioned |
| Answer» B. input terminal of motor | |
| 15. |
For_a_three_phase_synchronous_motor,_if_the_following_condition_is_satisfied,_it_can_be_said_that_it_is_operating_at |
| A. | |
| B. | Leading |
| C. | Lagging |
| Answer» C. Lagging | |
| 16. |
For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.2 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor? |
| A. | upf |
| B. | zpf |
| C. | lagging pf |
| D. | leading pf |
| Answer» B. zpf | |
| 17. |
for a 3 phase 315V alternator having impedance angle of 60 degree, the required load angle for the maximum power input to the generator is _______ |
| A. | 120° |
| B. | 60° |
| C. | 150° |
| D. | 30° |
| Answer» B. 60¬¨¬®‚Äö√†√ª | |
| 18. |
With constant E,V,Z, the maximum input power can be obtained at load angle of value _______ |
| A. | 180-θ |
| B. | 90+θ |
| C. | θ |
| D. | 180 |
| Answer» B. 90+‚âà√≠‚Äö√†√® | |
| 19. |
For a 3 phase synchronous motor, the load angle should be equal to impedance angle. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
For an alternator, the specified load angle should be _________ for an impedance angle of ‘θ’.$ |
| A. | δ=θ |
| B. | δ=90-θ |
| C. | δ=90+θ |
| D. | δ=-θ |
| Answer» B. ‚âà√≠¬¨‚Ä¢=90-‚âà√≠‚Äö√†√® | |
| 21. |
The condition for maximum power output for an alternator having its load impedance as (2+j) ohms is |
| A. | 26.56° |
| B. | 63.43° |
| C. | 90° |
| D. | 116.56° |
| Answer» B. 63.43¬¨¬®‚Äö√†√ª | |
| 22. |
Which is the correct relation below? |
| A. | Pim = -Pog |
| B. | Pim = (Pog)* |
| C. | Pim = Pog |
| D. | Pim = -(Pog)* |
| Answer» B. Pim = (Pog)* | |