Electrical Machine Design

1.
In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?

A. Small

B. Medium

C. Large

D. Any of the above.

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2.
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?

A. Small size machines

B. Medium size machines

C. Large size machines

D. Any of the above

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3.
The efficiency of a machine should be as ____________ as possible to reduce the operating cost?

A. High

B. Low

C. Either of the above

D. None of the above

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4.
Which of the following is the major consideration to evolve a good design ?

A. Cost

B. Durability

C. Compliance with performance criteria as laid down in specifications

D. All of the above

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5.
In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?

A. Low power factor

B. High power factor

C. High over load capacity

D. Any of the above

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6.
Electrical machines having a power output up to about 750 W may be called__________machines?

A. Small size

B. Medium size

C. Large size

D. Any of the above

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7.
If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?

A. Drastically increased

B. Drastically reduced

C. Unaffected

D. None of the above

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8.
impose limitation on design____________?

A. Saturation

B. Temperature rise

C. Efficiency

D. Power factor

E. All above

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9.
The design of mechanical parts is particularly important in case of __________ speed machines?

A. Low

B. Medium

C. High

D. Any of the above

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10.
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?

A. D.c. series motor .

B. D.c. shunt motor

C. Induction motor

D. Synchronous motor

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11.
The action of electromagnetic machines can be related to which of the following basic principles __________?

A. Induction

B. Interaction

C. Alignment

D. All of the above

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12.
The change in flux linkages can be caused in which of the following ways ?

A. The flux is constant with respect to time and is stationary and the coil moves through it

B. The coil is stationary with respect to flux and the flux varies in magnitude with respect to time

C. Both the changes mentioned above occur together, i.e., the coil moves through a time varying field

D. All of the above

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13.
Commercial available medium size machines have a speed range of __________ ?

A. 200 to 400 r.p.m

B. 600 to 1000 r.p.m

C. 1000 to 1500 r.p.m

D. 2000 to 2500 r.p.m

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14.
__________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?

A. Cast steel

B. Aluminium

C. Soft steel

D. Cast iron

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15.
_______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?

A. Silver

B. Steel

C. Aluminium

D. Copper

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General Subjects

Business

Computer MCQS

Sciences MCQS

1. In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?

Answer & Solution

2. Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?

Answer & Solution

3. The efficiency of a machine should be as ____________ as possible to reduce the operating cost?

Answer & Solution

4. Which of the following is the major consideration to evolve a good design ?

Answer & Solution

5. In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?

Answer & Solution

6. Electrical machines having a power output up to about 750 W may be called__________machines?

Answer & Solution

7. If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?

Answer & Solution

8. impose limitation on design____________?

Answer & Solution

9. The design of mechanical parts is particularly important in case of __________ speed machines?

Answer & Solution

10. The length cf air gap to be provided in __________ is primarily determined by power factor consideration?

Answer & Solution

11. The action of electromagnetic machines can be related to which of the following basic principles __________?

Answer & Solution

12. The change in flux linkages can be caused in which of the following ways ?

Answer & Solution

13. Commercial available medium size machines have a speed range of __________ ?

Answer & Solution

14. __________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?

Answer & Solution

15. _______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?

Answer & Solution

Engineering MCQS

General Subjects MCQS

1.
In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?

2.
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?

3.
The efficiency of a machine should be as ____________ as possible to reduce the operating cost?

4.
Which of the following is the major consideration to evolve a good design ?

5.
In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?

6.
Electrical machines having a power output up to about 750 W may be called__________machines?

7.
If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?

8.
impose limitation on design____________?

9.
The design of mechanical parts is particularly important in case of __________ speed machines?

10.
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?

11.
The action of electromagnetic machines can be related to which of the following basic principles __________?

12.
The change in flux linkages can be caused in which of the following ways ?

13.
Commercial available medium size machines have a speed range of __________ ?

14.
__________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?

15.
_______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?