A) Connected to the load B) Connected to supply mains C) Always high voltage winding D) Always low voltage winding. Ans : (B)
A) Short circuit test B) Hopkinson test C) Back to back test D) Open circuit test. Ans : (C)
A) 10 kVA, 200 Hz B) 10 kVA, 100 Hz C) 10 kVA, 60 Hz D) 10 kVA, 50 Hz. Ans : (A)
A) copper loss = iron loss B) hysteresis loss = eddy current loss C) core loss = hysteresis loss D) total loss = 2/3 x copper loss. Ans : (A)
A) reducing the airgap in the magnetic circuit B) increasing the airgap in the magnetic circuit C) increasing the thickness of lamination D) reducing the thickness of lamination. Ans : (D)
A) copper losses at half load B) copper losses at full load C) sum of iron losses and copper losses. D) iron losses at any load. Ans : (B)
A) the shape of core and yoke is know B) the weight of core and yoke is known C) the material of core and yoke is known D) the gauge of sheet used in core is known. Ans : (B)
A) under rating the transformer B) reducing the reluctance of the iron core to the minimum C) constantly cooling the core D) sectionizing and interleaving the primary and secondary windings. Ans : (D)
A) their ratio of transformation must be in proportion to the load shared B) they must operate at the same frequency C) their voltage rating must be in proportional to the load shared D) they must have equal kVA ratings. Ans : (B)
A) 1 kVA, 100 Hz B) 1 kVA, 60 Hz C) 1 kVA, 50 Hz D) 1kVA, 25 Hz. Ans : (D)