Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 2nd Semester (Second Semester) 2017-2018 REE201 Basic Electrical Engineering Question Paper
Paper Id: 120204 Roll No.
BTECH
(SEM-IV) THEORY EXAMINATION 2017-18
BASIC ELECTRICAL ENGINEERING
Time: 3 Hours Total Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
1. Attempt all questions in brief. 2 x 7 = 14
a) Define active and passive elements.
b) Define unilateral and bilateral elements.
c) Write a note on: Amplitude, mechanical degrees and angular velocity.
d) Explain the form factor and peak factor.
e) Differentiate between star and delta connections.
f) What information is obtained from the loop?
g) What is meant by the term speed regulation?
SECTION B
2. Attempt any three of the following: 7 x 3 = 21
a) Using nodal analysis, find the current through 8 ? resistor.
?????
b) Calculate the current in the 6 ? resistance by using Norton?s theorem.
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Printed Pages: 02 Sub Code: REE201
Paper Id: 120204 Roll No.
BTECH
(SEM-IV) THEORY EXAMINATION 2017-18
BASIC ELECTRICAL ENGINEERING
Time: 3 Hours Total Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.
SECTION A
1. Attempt all questions in brief. 2 x 7 = 14
a) Define active and passive elements.
b) Define unilateral and bilateral elements.
c) Write a note on: Amplitude, mechanical degrees and angular velocity.
d) Explain the form factor and peak factor.
e) Differentiate between star and delta connections.
f) What information is obtained from the loop?
g) What is meant by the term speed regulation?
SECTION B
2. Attempt any three of the following: 7 x 3 = 21
a) Using nodal analysis, find the current through 8 ? resistor.
?????
b) Calculate the current in the 6 ? resistance by using Norton?s theorem.
c) A balanced star-connected load of (8+j6) ? per phase is connected to a balanced 3-
phase, 400 V supply. Find the line current, power factor, power and total volt-
amperes.
d) A single phase, 50Hz, core type transformer has square cores of 20 cm side,
permissible maximum flux density is 1 Wb/m
2
. Calculate the number of turns per
limb on the high and low voltage sides for a 300/220 V ratio.
e) A 12-pole, 3-phase alternator is coupled to an engine running at 500 rpm. This
alternator supplies an induction motor running at 1450 rpm. Find slip and number of
poles of the induction motor.
SECTION C
3. Attempt any one part of the following: 7 x 1 = 7
a) The equation of an alternating current i = 42.42 sin 628 t. Determine (i) maximum
value (ii) frequency (iii) rms value (iv) average value (v) form factor.
b) Derive expressions for average value and rms value of a sinusoidally varying AC
voltage.
4. Attempt any one part of the following: 7 x 1 = 7
a) Derive expressions for impedance, current and power factor for an R-L-C series
circuit when applied with AC voltage. Draw also the vector diagram.
b) Derive an expression for parallel resonance and mention its salient features.
5. Attempt any one part of the following: 7 x 1 = 7
a) Derive the relationship between line current and phase current for delta connected 3-
phase load when supplied from 3-phase balanced supply.
b) Explain the working of a moving iron type instrument. Derive the expression for
torque produced.
6. Attempt any one part of the following: 7 x 1 = 7
a) Define self-inductance and mutual-inductance. What are hysteresis loss and eddy
current losses?
b) Discuss the principle of operation of a single-phase transformer. Derive emf equation
for a single-phase transformer.
7. Attempt any one part of the following: 7 x 1 = 7
a) Explain the principle of operation of a 3-phase synchronous motor.
b) Explain principle of operation of 1-phase induction motor using two revolving field
theory. List various methods of starting.
?
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This post was last modified on 29 January 2020