Multiple Choice Practices Electrical Machine Design - Set 05 - ObjectiveBooks

Multiple Choice Practices Electrical Machine Design - Set 05

Practice Test: Question Set - 05

1. Cylindrical windings using circular conductors, employed in transformers, are
    (A) Single layered
    (B) Double layered
    (C) Multilayered
    (D) None of the above

2. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
    (A) Short pitch
    (B) Full pitch
    (C) Either of the above
    (D) None of the above

3. The time taken by the machine to attain 0.632 of its final steady temperature rise is called
    (A) Heating time constant
    (B) Cooling time constant
    (C) Either (A) or (B)
    (D) None of the above

4. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
    (A) 10 MW
    (B) 30 MW
    (C) 60 MW
    (D) 150 MW

5. _________ 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

6. Impose limitation on design.
    (A) Saturation
    (B) Temperature rise
    (C) Efficiency
    (D) All above

7. The density of hydrogen is _________ times the density of air.
    (A) 0.07
    (B) 1.5
    (C) 2.5
    (D) 3.5

8. Tractive magnets are operated from
    (A) A.C. supply
    (B) D.C. supply
    (C) Either A.C. or D.C. supply
    (D) None of the above

9. Transformers with a capacity of up to _________ have a cooling radiator system with natural cooling
    (A) 2 MVA
    (B) 5 MVA
    (C) 7.5 MVA
    (D) 10 MVA

10. The cylindrical windings using circular conductors are used for current rating of
    (A) Upto 20 A
    (B) Upto 40 A
    (C) Upto 60 A
    (D) Upto 80 A

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