Electric Machine Design MCQ Tests - Set 04 - ObjectiveBooks

Electric Machine Design MCQ Tests - Set 04

Practice Test: Question Set - 04

1. The high voltage winding is usually which of the following type?
    (A) Cylindrical winding with circular conductors
    (B) Crossover winding with either circular or small rectangular conductors
    (C) Continuous disc type winding with rectangular conductors
    (D) All of the above types

2. Which of the following brushes can be used for high values of current density?
    (A) Metal graphite brushes
    (B) Hard carbon brushes
    (C) Electro-graphitic brushes
    (D) Natural graphite brushes

3. In D.C. machines, the ________ infield mmf results in increase in size and cost of machines.
    (A) Increase
    (B) Decrease
    (C) Either of the above
    (D) None of the above

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

5. 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

6. The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation?
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) All of the above

7. In direct cooled system using hydrogen both stator and rotor conductors are made
    (A) Solid
    (B) Hollow
    (C) Perforated
    (D) Any of the above

8. The value of exciting or magnetizing current depends upon which of the following factors?
    (A) Total mmf required
    (B) The number of turns in the exciting winding
    (C) The way in which the winding is distributed
    (D) All of the above

9. In transformers using hot rolled steel, the cross-section of the yoke is made about _________ greater than that of the core
    (A) 5 percent
    (B) 10 percent
    (C) 15 percent
    (D) 30 percent

10. The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are
    (A) 0.5 to 0.8 Wb/m2
    (B) 0.8 to 1.0 Wb/m2
    (C) 1.1 to 1.35 Wb/m2
    (D) 1.4 to 1.8 Wb/m2

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