MCQOPTIONS
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MCQOPTIONS
This section includes 20 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. |
In the following circle diagram, what is CC’? |
| A. | full load condition |
| B. | no load condition |
| C. | fixed losses |
| D. | rated full load losses |
| Answer» B. no load condition | |
| 2. |
Use the below circle diagram to choose the correct option. |
| A. | CF: Rotor copper loss, FG: Stator copper loss, GE: Fixed losses. |
| B. | FG:Rotor copper loss, CF: Stator copper loss, GE: Fixed losses. |
| C. | GE:Rotor copper loss, FG: Stator copper loss, CF: Fixed losses. |
| D. | FG:Rotor copper loss, CF: Stator copper loss, CF: Core losses. |
| Answer» B. FG:Rotor copper loss, CF: Stator copper loss, GE: Fixed losses. | |
| 3. |
If the no load test is conducted at its rated frequency but less than the rated voltage, then the mechanical losses will _____ and the constant losses will _________ |
| A. | constant, reduce |
| B. | constant, rise |
| C. | reduce, rise |
| D. | constant, constant |
| Answer» B. constant, rise | |
| 4. |
If the no load test is conducted at its rated frequency but less than the rated voltage, then the wattmeter reading will be ____________ |
| A. | reduced |
| B. | more than previous reading |
| C. | remain same |
| D. | none of the mentioned |
| Answer» B. more than previous reading | |
| 5. |
Stator resistance can be measured using Kelvin’s double bridge. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
In the following circle diagram of the induction motor, QN is the ____________ |
| A. | rotor current referred to stator |
| B. | stator current |
| C. | stator current referred to rotor |
| D. | no load input to rotor |
| Answer» B. stator current | |
| 7. |
In the below circle diagram, OG represents? |
| A. | Rated torque |
| B. | Maximum torque |
| C. | Rated power output |
| D. | Losses |
| Answer» B. Maximum torque | |
| 8. |
Blocked rotor test is conducted to find the ____________ |
| A. | leakage impedance |
| B. | leakage reactance |
| C. | stator impedance |
| D. | rotor impedance |
| Answer» B. leakage reactance | |
| 9. |
A 10kW, 50 Hz, 3-phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the power output that can now be obtained is? |
| A. | 5 kW |
| B. | 5.3 KW |
| C. | 4.6 kW |
| D. | 8 kW |
| Answer» B. 5.3 KW | |
| 10. |
A 10kW, 50 Hz, 3-phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the motor speed is? |
| A. | 1470rpm |
| B. | 1410rpm |
| C. | 1400rpm |
| D. | 1444rpm |
| Answer» B. 1410rpm | |
| 11. |
Circle diagram depicts the relation between ____________ |
| A. | stator current and the slip variation |
| B. | rotor current and stator current |
| C. | slip variation and the power factor |
| D. | slip variation and the losses of the machine |
| Answer» B. rotor current and stator current | |
| 12. |
Circle diagram of an induction motor is graphical representation of ____________ |
| A. | its equivalent circuit |
| B. | its rotor equivalent |
| C. | its stator equivalent |
| D. | its stationary equivalent circuit |
| Answer» B. its rotor equivalent | |
| 13. |
If the no load test is conducted at its rated frequency but less than the rated voltage, then the wattmeter reading will be$ |
| A. | reduced |
| B. | more than previous reading |
| C. | remain same |
| D. | none of the mentioned |
| Answer» B. more than previous reading | |
| 14. |
Stator_resistance_can_be_measured_using_Kelvin’s_double_bridge.$# |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
If the no load test is conducted at its rated voltage but less than the rated frequency. |
| A. | |
| B. | |
| Answer» B. | |
| 16. |
No load power factor of the induction motor will __________ if the no load test is conducted at its rated frequency but less than the rated voltage. |
| A. | improve |
| B. | degrade |
| C. | remain same |
| D. | none of the mentioned |
| Answer» B. degrade | |
| 17. |
If_the_no_load_test_is_conducted_at_its_rated_frequency_but_less_than_the_rated_voltage,_then_the_mechanical_losses_will_______and_the_constant_losses_will__________ |
| A. | constant, reduce |
| B. | constant, rise |
| C. | reduce, rise |
| D. | constant, constant |
| Answer» B. constant, rise | |
| 18. |
Blocked rotor test is conducted to find the |
| A. | leakage impedance |
| B. | leakage reactance |
| C. | stator impedance |
| D. | rotor impedance |
| Answer» B. leakage reactance | |
| 19. |
A 10kW, 50 Hz, 3-phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the power output that can now be obtained is |
| A. | 5 kW |
| B. | 5.3 KW |
| C. | 4.6 kW |
| D. | 8 kW |
| Answer» B. 5.3 KW | |
| 20. |
A 10kW, 50 Hz, 3-phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the motor speed is |
| A. | 1470rpm |
| B. | 1410rpm |
| C. | 1400rpm |
| D. | 1444rpm |
| Answer» B. 1410rpm | |