A single-phase 50 kVA, 250 V/500 V two winding transformer has an effi – McqOptions

MCQOPTIONS

1.	A single-phase 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity power factor. If it is reconfigured as a 500 V/750 V autotransformer, its efficiency at its new rated load at unity power factor will be
A.	95.752%
B.	97.851%
C.	98.276%
D.	99.241%
Answer» D. 99.241%

Discussion

No Comment Found

Related MCQs

For transformer given, turns ratio is equal to a, what will be the impedance of primary with respect to secondary?
Which of the following is the wrong expression?
Which of the following is the expression for emf induced in primary with voltage applied to primary of an ideal transformer?
Ideal transformer core has permeability equal to _____a) Zerob) Non-zero finitec) Negatived) Infinite 8.Turns ratio of the transformer is directly proportional to ____________
A 10 kVA, 200 V/2000 V transformer is feeding a load resistance of 2.5 p.u. based on the rating of HV side. The actual value of load resistance referred to LV side?
A transformer core is wound with a coil carrying alternating current at a frequency of 50 Hz. The hysteresis loop has an area of 60,000 units when the axes are drawn in units of 10-4 Wb m-2 and 102 Am-1. If the magnetization is uniform throughout the core volume of 0.01 m3, the power loss due to hysteresis will be
At low frequencies the material used for the transformer core is
Over fluxing protection is normally recommended for
As compared to Δ-Δ bank, the capacity of the V-V bank of transformers is ______ percent.
Laminated insulation, coated with varnish, is a staple adoption in transformer assemblage in order to