# math notes

May 15th, 2015
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Mathematical modeling. Standard formulation of optimization problems. Feasible set. The general procedure to solve a practical problem Example 1. Suppose that your friends are coming to visit you from another city and you plan to take them a LA tour during the weekend.

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Transformer and Induction Motors Monzon, Joe Kristoffer A. March 15, 2013BSECE 4Transformer Multiple Choice. Choose the correct answer. Quiz 11 Which of the following does not change in a transformer?(a) Current (b) Voltage(c) Frequency (d) All of the above2 In a transformer the energy is conveyed from primary to secondary (a) through cooling coil(b) through air(c) by the flux(d) none of the above3 A transformer core is laminated to(a) reduce hysteresis loss(b) reduce eddy current losses(c) reduce copper losses(d) reduce all above losses4 The degree of mechanical vibrations produced by the laminations of a transformer depends on (a) tightness of clamping(b) gauge of laminations(c) size of laminations(d) all of the above5 The no-load current drawn by transformer is usually what per cent of the full-load current? (a) 0.2 to 0.5 per cent(b) 2 to 5 per cent(c) 12 to 15 per cent(d) 20 to 30 per cent6 The path of a magnetic flux in a transformer should have(a) high resistance (b) high reluctance (c) low resistance (d) low reluctance 7 No-load on a transformer is carried out to determine(a) copper loss(b) magnetising current(c) magnetising current and loss(d) efficiency of the transformer8 The efficiency of a transformer will be maximum when(a) copper losses = hysteresis losses (b) hysteresis loss

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