The path of a magnetic flux in a transformer should have______________?

Related Mcqs:

1. The path of the magnetic flux in transformer should have____________?

   A. high reluctance
   B. low reactance
   C. high resistance
   D. low resistance

2. Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?

   A. Bmax
   B. Bmax1-6
   C. Bmax1-83
   D. B max

3. 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

4. The value of flux involved m the e.m.f. equation of a transformer is____________?

   A. average value
   B. r.m.s. value
   C. maximum value
   D. instantaneous value

5. The leakage flux in a transformer depends upon______________?

   A. load current
   B. load current and voltage
   C. load current, voltage and frequency
   D. load current, voltage, frequency and power factor

6. Which of the following is the main advantage of an auto-transformer over a two winding transformer?

   A. Hysteresis losses are reduced
   B. Saving in winding material
   C. Copper losses are negligible
   D. Eddy losses are totally eliminated

7. 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

8. 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

9. The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?

   A. magnetostrication
   B. boo
   C. hum
   D. zoom

10. The maximum efficiency of a distribution transformer is____________?

    A. at no load
    B. at 50% full load
    C. at 80% full load
    D. at full load