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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 | |