ELECTRICAL ENGINEERING ESE TOPICWISE OBJECTIVE SOLVED PAPER-I
1992-2019
Office: F-126, (Lower Basement), Katwaria Sarai, New Delhi-110 016 Phone: 011-26522064
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Mobile: 81309 09220, 97118 53908
Email: info.publications@iesmaster.org, info@iesmaster.org Web: iesmasterpublications.com, iesmaster.org
IES MASTER PUBLICATION F-126, (Lower Basement), Katwaria Sarai, New Delhi-110016 Phone : 011-26522064, Mobile : 8130909220, 9711853908 E-mail : info.publications@iesmaster.org Web : iesmasterpublications.com
All rights reserved. Copyright Š 2019, by IES MASTER Publication. No part of this booklet may be reproduced, or distributed in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise or stored in a database or retrieval system without the prior permission of IES MASTER Publication, New Delhi. Violates are liable to be legally prosecuted.
First Edition
: 2017
Second Edition : 2018 Third Edition
: 2019
Typeset at : IES Master Publication, New Delhi-110016
PREFACE
Engineering Services Examination is the gateway to an immensely satisfying job in the engineering sector of India that offers multi-faceted exposure. The exposure to challenges and opportunities of leading the diverse field of engineering has been the main reason behind engineering students opting for Engineering Services as compared to other career options. To facilitate selection into these services, availability of arithmetic solution to previous years’ paper is the need of the day. It is an immense pleasure to present previous years’ topic-wise objective solved papers of Engineering Services Examination (ESE). This book is an outcome of regular and detailed interaction with the students preparing for ESE every year. It includes solutions along with detailed explanation to all questions. The prime objective of bringing out this book is to provide explanation to each question in such a manner that just by going through the solutions, students will be able to understand the basic concepts and have the capability to apply these concepts in solving other questions that might be asked in future exams. Towards the end, this book becomes indispensable for every ESE aspiring candidate. IES Master Publication New Delhi
Note: Direction of all Assertion Reasoning (A–R) type of questions covered in this booklet is as follows: DIRECTIONS: The following four items consist of two statements, one labelled as ‘Assertion A’ and the other labelled as ‘Reason R’. You are to examine these two statements carefully and select the answer to these two statements carefully and select the answer to these items using the codes given below: (a) Both A and R are individually true and R is the correct explanation of A (b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true. Note: Direction of all Statement-I and Statement-II type of questions covered in this booklet is as follows: DIRECTION: Following items consists of two statements, one labelled as ‘Statement (I)’ and the other as ‘Statement (II)’. You are to examine these two statements carefully and select the answers to these items using the code given below: (a) Both Statement : (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I). (b) Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I). (c) Statement (I) is true but Statement (II) is false (d) Statement (I) is false but Statement (II) is true.
CONTENT
1.
Circuit Theory
............................................................................................. 01 – 212
2.
Control Systems ............................................................................................ 213 – 404
3.
Electro Magnetic Field Theory .......................................................................... 405 – 520
4.
Electrical Material ............................................................................................ 521 – 588
5.
Electric Measurement and Instrumentation ....................................................... 589 – 729
6.
Computer Fundamentals .................................................................................. 730 – 736
7.
Engineering Mathematics ................................................................................. 737 – 746
UNIT-1
CIRCUIT THEORY
SYLLABUS Circuits elements. Kirchoff’s Laws. Mesh and nodal analysis. Network Theorems and applications. Natural response and forced response. Transient response and steady state response for arbitrary inputs. Properties of networks in terms of poles and zeros. Transfer function. Resonant circuits. Three-phase circuits. Two-port networks. Elements of two-element network synthesis.
CONTENTS
1.
Network Elements ...................................................................... 01 – 47
2.
Transient and Steady State Response ..................................... 48 – 86
3.
Resonance ................................................................................... 87 – 118
4.
Network Theorems ................................................................. 119 – 147
5.
Two-Port Network .................................................................. 148 – 170
6.
Network Functions ................................................................. 171 – 186
7.
Network Synthesis .................................................................. 187 – 204
8.
3-Phase Circuits, Network Graphs and Filters .................. 205 – 212
2
1
NETWORK ELEMENTS
5.
IES-1992 1.
2.
The number of turns of a coil having a time constant T are doubled. Then the new time constant will be (a) T
(b) 2T
(c) 4T
(d) T/2
A
Current having wave form shown is flowing in a resistance of 10 ohms. The average power is
B
D
(a) 1 (c) 2 6.
(b) 0.5 (d) 1.5
(a)
1000 W 1
(b)
1000 W 2
A battery is connected to a resistance causing a current of 0.5 A in the circuit. The current drops to 0.4 A when additional resistance of 5 is connected in series. The current will drop to 0.2 A when the resistance is
(c)
1000 W 3
(d)
1000 W 4
(a) 10 (c) 25
0
1
2
t(sec)
3
In the figure shown, if we connect a source of 2 V, with internal resistance of 1 at A'A, with positive terminal at A', then the current through R is 1
7.
(b) 15 (d) 30
The current in resistor R shown in figure will be 1K + – 2V
A
1
1A
R=2 A
4.
When all the resistances in the circuit are of one ohm each, the equivalent resistance across the points A and B will be C
10A
3.
Electrical Engineering
ESE Topicwise Objective Solved Paper-I 1992-2019
(a) 2 A
(b) 1.66 A
(c) 1 A
(d) 0.625 A
In the circuit shown the value of I is I
8.
1K R=1K 1A
(a) 0.2 A
(b) 0.4 A
(c) 0.6 A
(d) 0.8 A
The circuit shown is a linear time invariant one and the sources are ideal. Choose from the answers given below, the values of voltage across and current through 1 resistor. 5
28 10A
4
1K
+ 1V –
5A
8
(a) 1 A
(b) 2 A
(c) 4 A
(d) 8 A
+
+ 5V V1 – –
(a) 1V, 1A (c) 5V, 5A
I1 1 1A
(b) 1V, 6A (d) None of the above
Electrical Engineering
9.
CIRCUIT THEORY
The equivalent capacitance across ab will be : 4.
0.1F
a
L
b
c 0.1F
d
0.1 F
R
d I t dt
+ –
L
+ –
C
1 I t dt C
volts
0.1F
(a)
0.2 F
(b) 0.1 F
Of these networks,
(c)
0.5 F
(d) 0
(a) all the four networks are equivalent (b) no two networks are equivalent
IES-1993
(c) networks shown in figures (2), (3) and (4) are equivalent
Assertion (A) : Kirchhoff’s current law is valid for an ac circuit containing R, L and C. Reason (R) : The sum of rms currents at any junction of the circuit is always zero.
11.
RI(t) + volts –
volts 0.1F L
10.
(d) networks shown in figures (3) and (4) are equivalent 13.
In the circuit shown in the figure, the voltage across the 2 ohm resistor is 4
2 1
6A
3
+ –
(a) 6 V
(b) 4 V
(c) 2 V
(d) zero
3V
14.
The number of 2 F , 400 V capacitors needed to obtain a capacitance value of 1.5 F rated for 1600 V is (a) 12
(b) 8
(c) 6
(d) 4
A connected planar network has 4 nodes and 5 elements. The number of meshes in its dual network is D B
C
2
Four networks are shown below in figures (1), (2), (3) and (4)
E
III
IES-1994 12.
3
I 1
3
5 II A 4
R
1.
I(t) amp
L C
15. I(t)
R
I(t)
L
I(t) amp
C
(a) 4
(b) 3
(c) 2
(d) 1
The value of the current I flowing in the 1 ohm resistor in the circuit shown in the given figure will be
2.
3.
I + 5V –
I(t)
R
I(t)
L
I(t) amp
C
16.
5A
1
(a) 10 A
(b) 6 A
(c) 5 A
(d) zero
In the circuit shown in the given Fig., the current I through RL is IES MASTER Publication
20
Electrical Engineering
ESE Topicwise Objective Solved Paper-I 1992-2019
ANSWER KEY 1.
(c)
33.
(a)
65.
(d)
97.
(a)
129.
(c)
2.
(c)
34.
(a)
66.
(a)
98.
(d)
130.
(c)
3.
(d)
35.
(b)
67.
(a)
99.
(a)
131.
(d)
4.
(b)
36.
(b)
68.
(c)
100.
(c)
132.
(b)
5.
(b)
37.
(b)
69.
(c)
101.
(a)
133.
(b)
6.
(d)
38.
(b)
70.
(d)
102.
(d)
134.
(c)
7.
(a)
39.
(d)
71.
(a)
103.
(b)
135.
(none)
8.
(c)
40.
(b)
72.
(a)
104.
(b)
136.
(d)
9.
(b)
41.
(c)
73.
(d)
105.
(b)
137.
(b)
10.
(c)
42.
(c)
74.
(b)
106.
(c)
138.
(b)
11.
(c)
43.
(b)
75.
(b)
107.
(b)
139.
(b)
12.
(a)
44.
(b)
76.
(b)
108.
(d)
140.
(b)
13.
(a)
45.
(b)
77.
(c)
109.
(a)
141.
(c)
14.
(b)
46.
(a)
78.
(b)
110.
(a)
142.
(b)
15.
(c)
47.
(c)
79.
(c)
111.
(a)
143.
(a)
16.
(d)
48.
(a)
80.
(b)
112.
(b)
144.
(d)
17.
(c)
49.
(d)
81.
(b)
113.
(c)
145.
(c)
18.
(a)
50.
(b)
82.
(b)
114.
(a)
146.
(d)
19.
(d)
51.
(a)
83.
(a)
115.
(c)
147.
(b)
20.
(d)
52.
(a)
84.
(d)
116.
(none)
148.
(b)
21.
(d)
53.
(b)
85.
(d)
117.
(d)
149.
(b)
22.
(c)
54.
(a)
86.
(c)
118.
(b)
150.
(a)
23.
(b)
55.
(none)
87.
(a)
119.
(a)
151.
(a)
24.
(c)
56.
(c)
88.
(b)
120.
(d)
152.
(b)
25.
(c)
57.
(b)
89.
(d)
121.
(c)
153.
(a)
26.
(d)
58.
(a)
90.
(c)
122.
(a)
154.
(b)
27.
(a)
59.
(c)
91.
(c)
123.
(none)
155.
(b)
28.
(c)
60.
(b)
92.
(a)
124.
(b)
156.
(c)
29.
(b)
61.
(c)
93.
(b)
125.
(d)
157.
(d)
30.
(c)
62.
(a)
94.
(c)
126.
(b)
158.
(b)
31.
(c)
63.
(c)
95.
(c)
127.
(d)
159.
(c)
32.
(c)
64.
(a)
96.
(b)
128.
(b)
160.
(b)