ABB Latest Placement Question Paper 2012.
ABB Technical question Paper 2012 Placement Papers.
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26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency
(a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases
28.After rain what happens to Insulator
(a) break-down strength of Insulator decreases, (b)Arch length reduces
29.Diversity factor helps to …………(what ?) [Read diversity factor, load factor, Reserve capacity factor in depth, with calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance
31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be
(a) Vm sin (-20)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant
34. In electro-dynamometer A,meter & wattmeter the type of scale is
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor.
(a) more, (b) less, (c) equal. Ans: (b)
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