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Chapter 28 Solutions
DELMAR'S STANDARD TEXT OF ELECTRICITY
- e = 0 Q1: What does happen if we change two currents? a. Q2: What does happen if we have a three-phase four poles machine? Q3: What does happen if we have a two-phase two poles machine? e = 0 Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali Ki. pw --arrow_forward(a) different number of turns (b) same size of copper wire (c) a common magnetic circuit (d) separate magnetic circuits. 10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary. 13. In performing the short circuit test of a trans- former (a) high voltage side is…arrow_forwardMarked out of 1.50 P Flag question 13. i) The data for a wind turbine is given below: Wind speed = 14 meters/sec, Length of blade = 10 meter. Choose the correct statement for this wind turbine. a. The input wind power to the turbine is 258 KW b. The input wind power to the turbine is 51.7KW c. The input wind power to the turbine is 25.8KW d. The input wind power to the turbine is 517KW 13. ii) Refer to the above wind turbine choose the correct statement a. The wind rotor swept area is 40square meters. b. The wind rotor swept area is 62.4 square meters. c. The wind rotor swept area is 314 square meters. d. The wind rotor swept area is 31.4 square meters. O O O Oarrow_forward
- 15 Two generators having X1= 0.2 P1-60, and ) 2= 0.3P+40. If P1 = 150 and P2 250 MW. What is the economic loading of each generatorithe load is 250 MW Where: 50 EP2 < 250* P = 1015 N N PP 139 84 NW P1= 100 MW P7 = 1FO MW P. = 136. 84 MW PP = 11O16 MW| P1 = 17 MW.P = 150 Marrow_forwardQuestion 6 Copper losses represent: O A. Losses due to friction of the moving parts O B. Windage losses O C. None of the other choices are correct O D. Friction losses in the windings of the machine E. Losses due to magnetization and demagnetization of the corearrow_forwardCalculate the generator current by the ohm method.arrow_forward
- 17 By laminating the core, the Hysteresis losses can be reduced. Select one: True Falsearrow_forwardPlease sir solve this question, electric machinesarrow_forwardmoodle.nct.edu.om/mod/quiz/attempt.php?attermpt=6123858&.cmid 63002#question-96 Portal When the load on a series generator is decreased, then the flux produced will be increased. Select one: O True in O False The accelerating anode in CRO is also called as positive electrode. Select one: O True O False MIEE2110M The neutral current in an unbalanced star connected system is not equal to 33°C Sunny hparrow_forward
- A docs.google.com/f 0 :D welding purpose is a shunt generator Indicate whether the following - * statement are true or false False True In a dc machine for the same value of Z, N, O armatūre, e.m.f. is more with wave winding than with lap windingarrow_forwardQ2) Three shunt generators operate in parallel and supply a load current of 12000 A, connected across the bus-bars. Details of the generators are given below, Eg4 = 450 V EgB = 460 V Egc = 410 V Generator A Generator B Generator C Raa = 0.02 N Ra = 0.025 A Rac = 0.01 a) Calculate the load voltage (bus bar voltage). b) Find the current supplied by each generator. c) Determine the output power (in KW) for each machine Neglect field current.arrow_forwardIdentify the installation symbol O Two way One gang switch O Two way Two gang switch O One way Two gang switch O One way One gang switcharrow_forward
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning