Introduction to Electrical Engineering (ESO-203A)
(2015-16, Second Semester)
Assignment No. : 11
1. A three-phase, 2000V, Y-connected, 2-pole, 50Hz,wound-rotor induction motor
has the following no-load and blocked-rotor test data:
No-load:
2000V 15.3 A
10
Introduction to Electrical Engineering (ESO-203A)
(2015-16, Second Semester)
Assignment No.6
1. In Fig. 1, given below, the 50 Hz AC source impedance is 320 +j500 . The source feeds a capacitor
and resistor loads through two ideal transformers, as shown.
ESO 203A: Introduction to Electrical Engineering (2014-15, II Semester)
Assignment # 12
1. A three-phase, star-connected synchronous generator has rating of 50 kVA, 41 5 V, 1500 rpm, 50Hz.
It has a resistance of 0.1 ohm/phase and a reactance of 2.0 ohm/ph
Introduction to Electrical Engineering (ESO 203A)
(2015-16, Second Semester)
Assignment No. 7
Question 1. A two pole DC generator has field winding with 1000 turns per pole. The radius and
length of the rotor of the machine are 10 cm and 25 cm, respective
Introduction to Electrical Engineering (ESO-203A)
(2015-16, Second Semester)
Assignment No. :3
1. A balanced -connected load has an impedance of 864 j252 /phase. The load is fed
through a line having an impedance of 0.5 + j4.0 /phase. The line voltage at
Introduction to Electrical Engineering (ESO 203A)
(2015-16, Second Semester)
Assignment No. 8
Question 1: OCC Data of DC shunt generator at 1200 rpm is given below:
E0 (V)
8
40
74
113
213
234
250
If (A)
0
0.5
1.0
1.5
3.0
3.5
4.0
Plot the OCC graph and fin
Introduction to Electrical Engineering (ESO-203A)
(2015-16, Second Semester)
Assignment No. : 10
1. A 3-phase 50 Hz induction motor has a full-load speed of 1440 rpm. For this motor
calculate,
(a) The number of poles,
(b) full-load slip and rotor frequenc
Introduction to Electrical Engineering (ESO-203A)
(2015-16, Second Semester)
Assignment No. : 1
1. Write the following AC signals in phasor form:a)
v t 311sin 314t 250 V
b)
c)
i t 10sin 10t 600 15sin 10t 300 A
i t 460sin 500 t 250 220cos 500 t 150 A
(Ans.
Introduction to Electrical Engineering (ESO 203A)
(2015-16, Second Semester)
Assignment No. 8
Question 1. OCC Data of DC shunt generator at 1200 rpm is given below:
E0 (V)
8
40
74
113
213
If (A)
0
0.5
1.0
1.5
3.0
234
3.5
Plot the OCC graph and find:
a. Fi
Introduction to Electrical Engineering (ESO 203A)
(2015-16, Second Semester)
Assignment No. 9
Question 1. A 230 V DC shunt machine has armature circuit resistance of 0.5 and a field circuit
resistance of 115 . If the machine is connected to 230 V supply m
Introduction to Electrical Engineering (ESO-203A)
(2015-16, Second Semester)
Assignment No. : 5
1. A transformer having 300 and 100 turns in primary and secondary windings respectively,
is wounded on a magnetic core having reluctance 2.5 10 4 AT/Wb. Assum
Introduction to Electrical Engineering (ESO-203A)
(2015-16, Second Semester)
Solution: Assignment No. : 10 (Even)
Problem:2
A 3-phase induction motor draws one fourth of the current at full load as it draws at starting.
If the starting torque is 1.5 times
ESO 203A: Introduction to Electrical Engineering (2014-115, II Semester)
Assignment # 12- Solutions
2. In a factory a 3-, 4 kV, 400 kVA synchronous machine is installed with other induction motors. The
following are the loads on the machine :
Induction mo
Department of Electrical Engineering
IIT Kanpur
16-Aug-13
Practice Problem 8
1.
Three impedances of value Z p=4+j3 are connected in star (Y). For
balanced line-to-line voltages of 208 V (rms), find the line current, the power
factor, and the total active
Department of Electrical Engineering
IIT Kanpur
14-Aug-13
Practice Problem 7
1.
Two impedances 14+5j and 18+10j are connected in parallel across a 200
V 50 Hz supply. Determine (a) the total current, power, and power factor. (b) The
capacitance which when
Department of Electrical Engineering
IIT Kanpur
12-Aug-13
Practice Problem 6
1.
0.5
V1
0.5
10
200<0 V
For the following circuit (a) Find I2 (b) The current I1 and the source
voltage V1 (c) The active power, reactive power, complex power by the
source.
I2
Department of Electrical Engineering
IIT Kanpur
02-Aug-13
Practice Problem 3
1.
For the following circuit find vx using (a) node analysis (b) Mesh (loop)
analysis.
10 mH
vx
0.1 mF
25
20 0 V
w=1000 rad/s
20 0 V
Vo
w=1000 rad/s
0
2.
Use Mesh (loop) analysis
Department of Electrical Engineering
IIT Kanpur
05-Aug-13
Practice Problem 4
1.
Find V1 using superposition principle.
-5j
V1
V2
j10
1<0 A
5
-j10
5j
10
0.5<-90 A
2.
When a 240 V-50 Hz supply is applied to a resistor of 15 Ohm in parallel
with an inductor,