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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