02. If we have 1000 parking spaces, we have 1000 lights each drawing 20 mA switched on at any one time (we'll have green for bay is free, red if occupied) What is the total current drawn into the primary side of the transformer? O 200 A O 1A O 2A O 400 A
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- please answer 4 four questions correctly and no need to write your explnation just final answer 1. The various types of errors in dynamometer wattmeters are A./Error due to Eddy currents B./Error due to pressure coil inductance C./All of above D./Error due to pressure coil capacitance E./Error due to friction 2.The primary winding of a potential transformer has A./no turns B/a larger number of turns C/a few turns only D/intermediate number of turns 3. The current transformer (CT) and potential transformer (PT) are used for A.measuring low current and voltages B.measuring high resistances and frequencies C.measuring very low current and voltages D.measuring high currents and voltages 4. The secondary winding of a potential transformer has A/ no turns B.intermediate number of turns C.a few turns only D.a large number of turnsQuestion:4 A Step-down transformer is given and calculate 5:1 120 V 60 Hz V2 i k2 i. Peak load and D.C. load voltage ii. D.C. CurrentQUESTION 4 A real transformer has 1500 turns on the primary and 2000 turns on the secondary. Rp = 200, Rs = 220, Xp = 80, and Xs = 150. Calculate the equivalent reactance Xe. O 36.70 O 16.40 O 9.710 O 25.30
- Refer to FigureI on Worksheet 1, to answer numbers 18 through 27 based on the fact that it is a 240/480V, 120/240V, 4 kVA single-phase transformer. AC RI Figure I AB BC REplease answer these four question which it is choosen a question please answer 4 quesion and no need to write your explnation just witre whcih one is the final answer 1.On what principle is Transformer working? A.Faraday's Law B.Ohm's Law C.Newton's Law 2.The selected answer has been saved. Click See Progress for confirmation. If still not saved, log out and re-login. Following are classifications of Transformers EXCEPT A.Step Up B.Step Aside C.Step Down 3. Which relation is wrong about Transformation Ratio, K A.V2/V1 B.N2/N1 C.I2/I1To prevent the harmful voltage induction by the series winding, the transformer primary must before opening or unloading None never be open be short be Open
- Question 11 Not yet answered Marked ou estion Previous page B step-up transformer, with turns ratio a 1/2, if we apply a 220v AC voltage on the primary side then the voltage on the secondary will be: O a. 440v. O b. 110v. Oc none of the previous Od. Ov. MAN SK hp Next page1. How to create a magnetic field with the use of electricity? 2. Why an Alternating Current can only be used in transformers? 3. How basic transformer works/principles ? 4. Compare and Contrast: Step-Up and Step-down transformers solve all or will dislike answer Solve all PartsWhat will be the losses of a transformer if it is working in step up mode compared to its losses in step down mode? O Less O More Same None of option
- I (2 A) N = 60 turns N = 30 turns •C Area (throughout) = 0.15 × 103 m² labcda = 0.16 m Determine the secondary current for the transformer above if the resultant clockwise flux in the core is 1.5x10*Wb. And the material of the core is cast iron. WattiteWhat are the different losses across the transformer? Which losses are variable? What turns ratio isrequired on the secondary of a transformer if the primary has 400 turns? The applied voltage is 220VAC and the secondary voltage is 11 V.4) A 25 kVA, single-phase transformer has 250 turns on the primary and 40 turns on the secondary winding. The primary is connected to 1500-volt, 50 Hz. The maximum flux in the core is A) 12 mWb B) 72 mWb C) 27 mWb D) Non all of the above.