Electric Machinery Fundamentals-Solution Manual 5th. Edition by Stephen Chapman | Holooly

Electric Machinery Fundamentals-Solution Manual [EXP-4736]

200 SOLVED PROBLEMS

Question: 6.7

(a) Calculate and plot the torque-speed characteristic of the motor in Problem 6-5. (b) Calculate and plot the output power versus speed curve of the motor in Problem 6-5.

Verified Answer:

(a) A MATLAB program to calculate the torque-speed...

Question: 4.17

(a) What are the rated current and internal generated voltage of this generator? (b) What field current does this generator require to operate at the rated voltage, current, and power factor?

Verified Answer:

(a) The rated line and armature current for this g...

Question: 4.16

(a) What is the saturated synchronous reactance of this generator at the rated conditions? (b) What is the unsaturated synchronous reactance of this generator? (c) Plot the saturated synchronous reactance of this generator as a function of load.

Verified Answer:

(a) The rated armature current for this generator ...

Question: 8.21

A 10-hp 120-V 1000 r/min shunt dc motor has a full-load armature current of 70 A when operating at rated conditions. The armature resistance of the motor is RA = 0.12 Ω, and the field resistance RF is 40 Ω. The adjustable resistance in the field circuit Radj may be varied over the range from 0 to

Verified Answer:

(a) If

{ R }_{ adj }

= 100 Ω, the...

Question: 2.17

A 10-kVA 480/120-V conventional transformer is to be used to supply power from a 600-V source to a 120-V load. Consider the transformer to be ideal, and assume that all insulation can handle 600 V. (a) Sketch the transformer connection that will do the required job. (b) Find the kilovoltampere

Verified Answer:

(a) For this configuration, the common winding mus...

Question: 2.18

A 10-kVA 480/120-V conventional transformer is to be used to supply power from a 600-V source to a 480-V load. Consider the transformer to be ideal, and assume that all insulation can handle 600 V.(a) Sketch the transformer connection that will do the required job.(b) Find the kilovoltampere rating

Verified Answer:

(a) For this configuration, the common winding mus...

Question: 5.19

A 100-hp 440-V 0.8-PF-leading Δ-connected synchronous motor has an armature resistance of 0.3 Ω and a synchronous reactance of 4.0 Ω. Its efficiency at full load is 96 percent. (a) What is the input power to the motor at rated conditions? (b) What is the line current of the motor at rated

Verified Answer:

(a) The input power to the motor at rated conditio...

Question: 2.1

A 100-kVA 8000/277-V distribution transformer has the following resistances and reactances: RP = 5 Ω RS = 0.005 Ω XP = 6 Ω XS = 0.006 Ω RC = 50 kΩ XM = 10 kΩ The excitation branch impedances are given referred to the high-voltage side of the transformer. (a) Find the equivalent circuit of this

Verified Answer:

(a) The turns ratio of this transformer is a = 800...

Question: 2.11

A 100-MVA 230/115-kV Δ-Y three-phase power transformer has a per-unit resistance of 0.015 pu and a per-unit reactance of 0.06 pu. The excitation branch elements are RC =100 pu Xm =20 pu (a) If this transformer supplies a load of 80 MVA at 0.8 PF lagging, draw the phasor diagram of one phase of the

Verified Answer:

(a) The transformer supplies a load of 80 MVA at 0...

Question: 4.7

A 100-MVA, 14.4-kV, 0.8-PF-lagging, 50-Hz, two-pole, Y-connected synchronous generator has a perunit synchronous reactance of 1.1 and a per-unit armature resistance of 0.011. (a) What are its synchronous reactance and armature resistance in ohms? (b) What is the magnitude of the internal generated

Verified Answer:

The base phase voltage of this generator is [latex...

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