Ql: Determine the total inductance of Figure 1.1 and Figure 1.2

= 1H

L1 = 4 H

L = H

= 200 mH = 600 mH

Figure 1.1 Figure 1.2

Q2.

1. For the air-core transformer of Fig. 21.55:

a. Find the value of L. if the mutual inductance M is equal to 80 mH.

b. Find the induced voltages ep and e, if the flux linking the primary coil changes at the rate of 0.08 Wbis.

c. Find the induced voltages ep and e, if the current 7.p. changes at the rate of 0_3 Ainis.

r.P=50nH N_ = 80

IF

Np = 20 Ls

0.8

Figure 21.55

I 9, 3,43 am IAcr 21 C1),..t

Q4: For the iron-c ore transformer of figure 21 _57

Q.5: If TNTr,-400, Ns-1200, and V, 100T, find the

Q.6:

a. For the circuit of Fig_ 21.58, find the transformation ratio required to deliver maximum power to the speaker_

b. Find the maximum power delivered to the speaker.

= 20V

FIG. 21.58

Q7: For the transfoliner of figure 6.1, deteimine

a. the equivalent resistance Re_

b. the equivalent reactance Are.

c. the equivalent circuit reflected to the primary_

d. the primary current for Vg = 50 V L0_

e. the load voltage VL.

f. the phasor diagram of the reflected primary circuit.

g. the new load voltage if we assume the transformer to be ideal with a 4 : 1 turns ratio. Compare the result with that of part (e).

4 1

R.

RP I

+ 4 II 8

= 120 V LO°

Figure 6.1

An ideal transformer is rated 10 kVA, 2400/120 V, 60 Hz_

a. Find the transformation ratio if the 120 V is the secondary voltage.

b. Find the current rating of the secondary if the 120 V is the secondary voltage_

c. Find the current rating of the primary if the 120 V is the secondary voltage.

d. Repeat parts (a) through (c) if the 2400 V is the secondary voltage.

= 1H

L1 = 4 H

L = H

= 200 mH = 600 mH

Figure 1.1 Figure 1.2

Q2.

1. For the air-core transformer of Fig. 21.55:

a. Find the value of L. if the mutual inductance M is equal to 80 mH.

b. Find the induced voltages ep and e, if the flux linking the primary coil changes at the rate of 0.08 Wbis.

c. Find the induced voltages ep and e, if the current 7.p. changes at the rate of 0_3 Ainis.

r.P=50nH N_ = 80

IF

Np = 20 Ls

0.8

Figure 21.55

I 9, 3,43 am IAcr 21 C1),..t

Q4: For the iron-c ore transformer of figure 21 _57

Q.5: If TNTr,-400, Ns-1200, and V, 100T, find the

Q.6:

a. For the circuit of Fig_ 21.58, find the transformation ratio required to deliver maximum power to the speaker_

b. Find the maximum power delivered to the speaker.

= 20V

FIG. 21.58

Q7: For the transfoliner of figure 6.1, deteimine

a. the equivalent resistance Re_

b. the equivalent reactance Are.

c. the equivalent circuit reflected to the primary_

d. the primary current for Vg = 50 V L0_

e. the load voltage VL.

f. the phasor diagram of the reflected primary circuit.

g. the new load voltage if we assume the transformer to be ideal with a 4 : 1 turns ratio. Compare the result with that of part (e).

4 1

R.

RP I

+ 4 II 8

= 120 V LO°

Figure 6.1

An ideal transformer is rated 10 kVA, 2400/120 V, 60 Hz_

a. Find the transformation ratio if the 120 V is the secondary voltage.

b. Find the current rating of the secondary if the 120 V is the secondary voltage_

c. Find the current rating of the primary if the 120 V is the secondary voltage.

d. Repeat parts (a) through (c) if the 2400 V is the secondary voltage.

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