Introductory Circuit Analysis 13th. Edition by Boylestad, Robert | 9780133923605 | 133923606 | Holooly

Introductory Circuit Analysis [EXP-48382]

431 SOLVED PROBLEMS

Question: 9.14

(Two sources) Find the Norton equivalent circuit for the portion of the network to the left of a-b in Fig. 9.78.

Verified Answer:

Steps 1 and 2: See Fig. 9.79. Step 3: See Fig. 9.8...

Question: 9.10

(Two sources) Find the Thévenin circuit for the network within the shaded area of Fig. 9.48.

Verified Answer:

Steps 1 and 2: See Fig. 9.49. The network is redra...

Question: 4.15

A 2 hp motor operates at an efficiency of 75%. What is the power input in watts? If the applied voltage is 220 V, what is the input current?

Verified Answer:

\eta \% =\frac{P_o}{P_i}\times 100 \%[/late...

Question: 20.8

A 5 hp motor with a 0.6 lagging power factor and an efficiency of 92% is connected to a 208 V, 60 Hz supply. a. Establish the power triangle for the load. b. Determine the power-factor capacitor that must be placed in parallel with the load to raise the power factor to unity. c. Determine the change

Verified Answer:

a. Since 1hp = 746W,

P_o = 5 hp = 5(746 W) ...

Question: 9.15

A dc generator, battery, and laboratory supply are connected to resistive load RL in Fig. 9.91. a. For each, determine the value of RL for maximum power transfer to RL. b. Under maximum power conditions, what are the current level and the power to the load for each configuration? c. What is the

Verified Answer:

For the 12 V car battery,

R_L = R_{Th} = R_...

Question: 24.9

A phase-sequence indicator is an instrument such as shown in Fig. 24.37(a) that can display the phase sequence of a polyphase circuit. A network that performs this function appears in Fig. 24.37(b). The applied phase sequence is ABC. The bulb corresponding to this phase sequence burns more brightly

Verified Answer:

Calculating the phase currents demonstrates that t...

Question: 21.3

A series R-L-C circuit has a series resonant frequency of 12,000 Hz. a. If R = 5 Ω, and if XL at resonance is 300 Ω, find the bandwidth. b. Find the cutoff frequencies.

Verified Answer:

a.

Q_s=\frac{X_L}{R}=\frac{300 Ω}{5 Ω}=60\...

Question: 21.5

A series R-L-C circuit is designed to resonate at ωs = 10^5 rad/s, have a bandwidth of 0.15ωs, and draw 16 W from a 120 V source at resonance. a. Determine the value of R. b. Find the bandwidth in hertz. c. Find the nameplate values of L and C. d. Determine the Qs of the circuit. e. Determine the

Verified Answer:

a.

P=\frac{E^2}{R}\hspace{30 pt} and \hspa...

Question: 22.12

A transistor amplifier has the following gain: Aν=100/(1-j 50Hz/f)(1-j 200Hz/f)(1+j f/10kHz)(1+j f/20kHz) a. Sketch the normalized response A′ν = Aν/Aνmax, and determine the bandwidth of the amplifier. b. Sketch the phase response, and determine a frequency where the phase angle is close to 0°.

Verified Answer:

a.

A^{\prime}_{\nu}=\frac{A_\nu}{A_{\nu_{m...

Question: 20.9

a. A small industrial plant has a 10 kW heating load and a 20 kVA inductive load due to a bank of induction motors. The heating elements are considered purely resistive (Fp = 1), and the induction motors have a lagging power factor of 0.7. If the supply is 1000 V at 60 Hz, determine the capacitive

Verified Answer:

a. For the induction motors,

S = VI = 20 kV...

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