MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 10 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. |
LARGE_SYNCHRONOUS_MACHINES_ARE_CONSTRUCTED_WITH_ARMATURE_WINDING_ON_THE_STATOR_BECAUSE_STATIONARY_ARMATURE_WINDING?$ |
| A. | can be insulated satisfactorily for higher voltages |
| B. | can be cooled more efficiently |
| C. | would lead to reduced slip ring losses |
| D. | would have no slot harmonics |
| Answer» C. would lead to reduced slip ring losses | |
| 2. |
HOW_MANY_POLES_SHOULD_THE_ALTERNATORS_DRIVEN_BY_THE_OIL_ENGINES_AND_HYDRAULIC_TURBINE_PRIME_MOVERS_MUST_HAVE,_FOR_BETTER_OPERATION??$ |
| A. | fewer number of poles |
| B. | larger number of poles |
| C. | medium number of poles |
| D. | any of the mentioned |
| Answer» C. medium number of poles | |
| 3. |
What is the equation for frequency of generated EMF? |
| A. | f = PN/120 Hz |
| B. | f = 120/PN Hz |
| C. | f = P/120 Hz |
| D. | f = N/120 Hz |
| Answer» B. f = 120/PN Hz | |
| 4. |
In a synchronous machine, salient pole construction has been found to suit best for ___________ |
| A. | low speed prime movers |
| B. | high speed prime movers |
| C. | medium speed prime movers |
| D. | any of the mentioned |
| Answer» B. high speed prime movers | |
| 5. |
What is the advantage of connecting two coils in parallel? |
| A. | reduce the amount of copper required |
| B. | increase the current per parallel path to double the value |
| C. | increase the voltage capacity |
| D. | all of the mentioned |
| Answer» C. increase the voltage capacity | |
| 6. |
The stator frame and end covers in synchronous and induction machines are designed to ___________ |
| A. | carry the magnetic flux |
| B. | to serve as a mechanical support |
| C. | to provide cooling or to carry induced EMF |
| D. | any of the mentioned |
| Answer» C. to provide cooling or to carry induced EMF | |
| 7. |
What are the advantages of providing the field winding on rotor and armature winding on the stator? |
| A. | more economical |
| B. | more efficient |
| C. | efficient cooling |
| D. | all of the mentioned |
| Answer» E. | |
| 8. |
For an induction motor, |
| A. | squirrel cage type is simpler and more economical in construction |
| B. | wound rotor type requires less maintenance |
| C. | squirrel cage type is more rugged and requires less maintenance |
| D. | no external resistance can be inserted in the rotor circuit of squirrel cage induction motor |
| Answer» D. no external resistance can be inserted in the rotor circuit of squirrel cage induction motor | |
| 9. |
In which of the following applications, wound rotor type of induction motor is used? |
| A. | where the driven load requires speed control |
| B. | where high starting torque is required |
| C. | when external resistance is to be inserted |
| D. | any of the mentioned |
| Answer» E. | |
| 10. |
Which type of slots are used in the construction of large size and small size induction motors respectively? |
| A. | open slots and semiclosed slots |
| B. | semiclosed slots and open slots |
| C. | open slots and open slots |
| D. | semiclosed slots and semiclosed slots |
| Answer» B. semiclosed slots and open slots | |