Electrical Transformers Online Quiz Test - Set 12 - ObjectiveBooks

Electrical Transformers Online Quiz Test - Set 12

Practice Test: Question Set - 12


1. The size of a transformer core will depend on
    (A) Frequency
    (B) Area of the core
    (C) Flux density of the core material
    (D) Both (A) and (B)

2. The full-load copper loss of a transformer is 1600 W. At half-load, the copper loss will be
    (A) 6400 W
    (B) 1600 W
    (C) 800 W
    (D) 400 W

3. The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer
    (A) Conservator
    (B) Breather
    (C) Bushings
    (D) Buchholz relay

4. The efficiency of two identical transformers under load conditions can be determined by
    (A) Short-circuit test
    (B) Back-to-back test
    (C) Open circuit test
    (D) Any of the above

5. The voltage transformation ratio of a transformer is equal to the ratio of
    (A) Primary turns to secondary turns
    (B) Secondary current to primary current
    (C) Secondary induced e.m.f. to primary induced e.m.f.
    (D) Secondary terminal voltage to primary applied voltage

6. The permissible flux density in case of cold rolled grain oriented steel is around
    (A) 1.7 Wb/m2
    (B) 2.7 Wb/m2
    (C) 3.7 Wb/m2
    (D) 4.7 Wb/m2

7. Natural oil cooling is used for transformers up to a rating of
    (A) 3000 kVA
    (B) 1000 kVA
    (C) 500 kVA
    (D) 250 kVA

8. The use of higher flux density in the transformer design
    (A) Reduces weight per kVA
    (B) Reduces iron losses
    (C) Reduces copper losses
    (D) Increases part load efficiency

9. Delta/star transformer works satisfactorily when
    (A) Load is balanced only
    (B) Load is unbalanced only
    (C) On balanced as well as unbalanced loads
    (D) None of the above

10. Noise level test in a transformer is a
    (A) Special test
    (B) Routine test
    (C) Type test
    (D) None of the above

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