Machine Design Electrical Engineering MCQ - Set 03 - ObjectiveBooks

Machine Design Electrical Engineering MCQ - Set 03

Practice Test: Question Set - 03

1. Which of the following methods is used for air cooling of turbo-alternators?
    (A) One sided axial ventilation
    (B) Two sided axial ventilation
    (C) Multiple inlet system
    (D) All of the above

2. The heat dissipated by from a surface depends upon its temperature and its characteristics like color, roughness etc.
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) Any of the above

3. Materials exhibiting zero value of resistivity are known as ________.
    (A) Conductors
    (B) Semiconductors
    (C) Insulators
    (D) Superconductors

4. 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.

5. __________ 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

6. With conventional hydrogen cooling it is possible to increase the rating of a single unit to
    (A) 50 MW
    (B) 100 MW
    (C) 200 MW
    (D) None of the above

7. By which of the following methods the temperature rise of windings and other parts may be determined?
    (A) Thermometer method
    (B) Resistance method
    (C) Embedded temperature detector method
    (D) Any of the above

8. 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

9. Power transformers have rating
    (A) Equal to 50 kVA
    (B) Equal to 100 kVA
    (C) Above 200 kVA
    (D) None of the above

10. Disc windings are primarily used in
    (A) Short capacity transformers
    (B) Medium capacity transformers
    (C) High capacity transformers
    (D) Any of the above

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