Question 2 A machine with a coil having an internal resistance of 32 and an inductance of 0.1 H is supplied by an a.c. source of 240 V, 50 Hz. Figure Q2 shows the equivalent circuit of the machine. + V1 R1 3 Ω Figure Q2 L1 야 0.1 H a) Evaluate the power rating requirement of the machine. [Hint: Power rating is the total amount of power required by a machine to work under normal situation.] b) Evaluate the energy efficiency of the machine. [Hint: Power factor is an expression of energy efficiency.] c) Verify your evaluation in Q2(b) by determining the active and reactive power in the circuit. d) Design a power factor correction circuitry to improve the machine efficiency to at least 90%.

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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Question 2
A machine with a coil having an internal resistance of 3 and an inductance of 0.1 H is
supplied by an a.c. source of 240 V, 50 Hz. Figure Q2 shows the equivalent circuit of the
machine.
V1
R1
3 Ω
Figure Q2
L1
야
0.1 H
a) Evaluate the power rating requirement of the machine.
[Hint: Power rating is the total amount of power required by a machine to work under
normal situation.]
b) Evaluate the energy efficiency of the machine.
[Hint: Power factor is an expression of energy efficiency.]
c) Verify your evaluation in Q2(b) by determining the active and reactive power in the
circuit.
d) Design a power factor correction circuitry to improve the machine efficiency to at least
90%.
Transcribed Image Text:Question 2 A machine with a coil having an internal resistance of 3 and an inductance of 0.1 H is supplied by an a.c. source of 240 V, 50 Hz. Figure Q2 shows the equivalent circuit of the machine. V1 R1 3 Ω Figure Q2 L1 야 0.1 H a) Evaluate the power rating requirement of the machine. [Hint: Power rating is the total amount of power required by a machine to work under normal situation.] b) Evaluate the energy efficiency of the machine. [Hint: Power factor is an expression of energy efficiency.] c) Verify your evaluation in Q2(b) by determining the active and reactive power in the circuit. d) Design a power factor correction circuitry to improve the machine efficiency to at least 90%.
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