ECE 3614
FUNDAMENTALS OF ENERGY SYSTEMS
HOMEWORK SET #7
INDUCTION MACHINES
7-1.
A three-phase 5 hp, 208 V, 60 Hz induction motor operates at 1737 rpm at rated load.
Determine (a.) the number of poles for the motor (b.) the slip at rated load (c.) the freq
ECE 3614
FUNDAMENTALS OF ENERGY SYSTEMS
HOMEWORK SET #6
DC MACHINES
6-1.
Two four-pole 1000 rpm DC machines with rated voltages of 120 V (machine #1) and
240 V (machine #2) are to be designed using the same total number of identical coils (Nc)
which are r
ECE 3614
FUNDAMENTALS OF ENERGY SYSTEMS
HOMEWORK SET #5
THREE-PHASE TRANSFORMERS / PER-UNIT SYSTEM ANALYSIS
5-1.
A 30 kVA, 460/208 V three-phase transformer is formed using three 10 kVA, 460/120 V
single-phase transformers. The three-phase transformer del
ECE 3614
FUNDAMENTALS OF ENERGY SYSTEMS
HOMEWORK SET #4
TRANSFORMERS
4-1.
An ideal transformer (N1 = 800, N2 = 200) with a primary source of V1 = 2200o V-rms
delivers a complex power of S2 = 230o kVA to the load connected to the secondary.
Determine (a.)
ECE 3614
FUNDAMENTALS OF ENERGY SYSTEMS
HOMEWORK SET #3
MAGNETIC CIRCUITS
3-1.
Determine the following quantities given the magnetic circuit shown below: (a.) the total
reluctance of the magnetic core (b.) the total magnetic flux within the core and (c.)
ECE 3614
FUNDAMENTALS OF ENERGY SYSTEMS
HOMEWORK SET #2
THREE-PHASE POWER
2-1.
A wye-wye balanced three-phase system with a phase voltage of 120 V-rms (positive
phase sequence) has a line impedance of Zline= (1+j1) and a load impedance of ZY =
(8+j3) . If
ECE 3614
FUNDAMENTALS OF ENERGY SYSTEMS
HOMEWORK SET #1
SINGLE-PHASE POWER
1-1.
The phasor voltage across a load impedance in a 60 Hz single-phase network is 62 30o
V-rms. The phasor current flowing through the load is 2 10o A-rms. Determine (a.)
the aver