A) the windage losses will be more B) the copper losses will be less C) the iron losses will be less D) the iron losses will be more. Ans : (D)
A) RMS B) Average C) Maximum D) Instantaneous. Ans : (C)
A) 1 kVA B) 5 kVA C) 50 kVA D) 500 kVA. Ans : (B)
A) 0° B) 90° C) 180° D) Between 30° and 60°. Ans : (C)
A) One fourth B) Half C) 2 times D) 4 times. Ans : (A)
A) core losses are equal to copper losses B) core losses are more than copper losses C) core losses are less than copper losses D) core losses are half of the copper losses Ans : (C)
A) depend only on the supply voltage B) decreases as the load on transformer increases C) vary from 10% to 50% between no load and full load D) vary from 1% to 3% between no load and full load. Ans : (A)
A) to lubricate the moving parts B) to provide protection against short circuiting C) to provide protection against lightning D) to provide insulation and cooling. Ans : (D)
A) open circuit test is conducted on high voltage side and short circuit test on low voltage side B) open circuit test is conducted on low voltage side and short circuit test on high voltage side C) open circuit and short circuit tests are conducted on high voltage side D) open circuit and short circuit tests are conducted on low voltage side. And : (B)
A) 0.8 lagging power factor B) 0.8 leading power factor C) Unity power factor D) Zero power factor. Ans : (C)