Find the maximum winding resistance of the secondary winding

Assignment Help Electrical Engineering

Reference no: EM131849134

1. FIGURE 1 shows a 50 ? load being fed from two voltage sources via their associated reactances. Determine the current i flowing in the load by:

(a) applying Thévenin's theorem

(b) applying the superposition theorem

(c) by transforming the two voltage sources and their associated reactances into current sources (and thus form a pair of Norton generators).

143_Fig 1.jpg

2. Determine, using the values given in TABLE A, the current I in the circuit of FIGURE 2 by:

(a) mesh analysis

(b) nodal analysis.

2265_Fig 2.jpg
3. For the balanced three-phase loads shown in FIGURE 3,

ZY = (15 + j15) ? and Z? = (45 + j45) ?.

Determine:

(a) the equivalent single ?-connected load,

(b) the equivalent single Y-connected load obtained from the ?-Y transformation of (a) above,

(c) the equivalent single Y-connected load obtained by transforming the ? sub-load of FIGURE 3 to a Y and with the star-points of the two Y-sub-circuits connected together,

(d) the total power consumed in case (a) above if the line voltage of the three-phase supply is 415 V at 50 Hz.

1288_Fig 3.jpg

4. FIGURE 4(a) shows two inductances connected in parallel across an a.c. supply.

(a) Apply Kirchhoff's voltage law to loop abef and to loop abcdef of the circuit.

(b) Hence or otherwise obtain the current ratio I1 in terms of the I2 circuit inductances.

(d) A 1 nF capacitor is placed across the two inductors (FIGURE 4 (c)). If L1 = L2 = L and k = 0.5, determine the required value of L if the minimum current I flows from the supply when it is at a frequency of 1 MHz.

163_Fig 4.jpg

5. A 415V to 11 kV transformer has a rating of 200 kVA. The winding resistance and leakage reactance when referred to the primary are 0.014 ? and 0.057 ? respectively.

(a) Determine the % regulation of the transformer at 0.8 power factor lagging.

(b) In designing a particular 415V to 11 kV, 200 kVA transformer, the primary winding resistance is to be 10 m?.

Find the maximum winding resistance of the secondary winding if the transformer is to have 2% regulation at unity power factor.

Reference no: EM131849134

Questions Cloud

Write down three page autobiography : There are many different types of families, each of which is equally viable as a supportive, caring unit. Identify which type of family unit you grew up in.

Standard deviation of the new distribution : If you divide each score in the distribution by 3, what its he standard deviation of the new distribution? Please explain how you got answer.

Confidence interval for the proportion of coaching : Construct and interpret a 99% confidence interval for the proportion of coaching among students who retake the SAT. Follow 4 step process.

How do we as healthcare practitioners needs in our society : How do we as healthcare practitioners, address the growing needs in our society, while still being fiscally responsible

Find the maximum winding resistance of the secondary winding : Find the maximum winding resistance of the secondary winding if the transformer is to have 2% regulation at unity power factor.

What is the median recovery time : Use the following information to answer the next exercises: The patient recovery time from a particular surgical procedure

Identify the major symptoms and characteristics : For each disorder in the tables, identify the major symptoms and characteristics. Feel free to refer to your readings and course materials.

Relative to the positive direction of the x-axis : A particle of charge -q is at the origin of an x -axis (a) at what location on the acis should a particle of charge -4q1 be placed so that the net electric

Subatomic particles in the nuclei of atoms : Question:1. a) Describe the balance of forces that hold together the subatomic particles in the nuclei of atoms.

User Account

All Pages