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Electrical Machines problem - Electricalengineering
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1.7 A magnetic circuit has eddy-current loss P. 1000 W and hysteresis loss P₁800 W at rated voltage and rated frequency. If the frequency is reduced by 20% while the flux density remains constant, the eddy-current loss P, and hysteresis loss P₁, become.... W and.... W. b. d. P.-640, P₁ = 640 P. = 200, P₁ = 160 b. 108 W c. P,= 400, P₁ = 160 1.8 The eddy current loss in a magnetic circuit is found to be 100 W when the exciting coil is energized by 200 V, 50 Hz source. If the coil is supplied with 180 V, 54 Hz instead, the eddy current loss will become: a. 90 W 1.9 A transformer transforms: a. the frequency. b. G81 W the power at constant frequency. a. /twiod) = 10 Ixed=100 the voltage at constant power. both the power and the voltage. 1.10 In single phase transformers, what type of losses always exist regardless of the load: Core b. Copper c. Stray d. (a) and (b) 1.11 Short circuit test is conducted in transformers to find: a. winding resistance b. winding leakage reactance e. none of the above P.=800, P₁ - 640 strated) 16.7 c. rated)167 d. 50 W on-125 e. none of the above e. none of the above 4.97% c. -3.26% c. 1.12 The rated primary and secondary currents of a 20 kVA, 1200/120 V single-phase transformer when this transformer delivers a load of 12 kW at PF-0.8 lagging are..... A and ..... A. 12.5 d. 13.4 12-134 secondary turm. The secondary turns. The 1.13 A single-phase transformer has 400 primary turns and 800 net iron cross sectional area of the core is 40 cm². If the primary winding is connected to a 60 Hz supply at 600 V. The maximum value of the core flux density, B, is ... T. b. B=0.7 c. B_ = 2.8 none of the above e. none of the above c. core resistance (a) and (b) d. 3.26% d. B=5.6 B.-1.4 e. none of the above 1.14 A single-phase transformer has 180 and 45 turns, respectively, on its primary and secondary windings. The corresponding resistances are R₁ = 0.24252 and R₂ = 0.07602, respectively. The equivalent resistance R' referred to the primary is ..... a. 0.55 b. 0.32 e. none of the above c. 0.14 d. 1.46 e. none of the above 1.15 A 500-KVA, 2300/230-V transformer has a series impedance referred to the secondary Z-0.002+ 0.0062. The percentage voltage regulation when the transformer is delivering its rated load at 0.8 PF lagging is: a. 2.05% e. none of the above