Download GTU BE/B.Tech 2019 Winter 1st And 2nd Sem New And Spfu 3110005 Basic Electrical Engineering Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 1st And 2nd Sem New And Spfu 3110005 Basic Electrical Engineering Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? I & II (NEW) EXAMINATION ? WINTER 2019
Subject Code: 3110005 Date: 11/01/2020

Subject Name: Basic Electrical Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.


Marks

Q.1 (a) State Ohm?s law and Kirchhoff?s Laws in context with DC circuits. 03
(b) A 100V,60 Watt bulb is to be operated from a 220V supply. What is
the resistance to be connected in series with the bulb to glow
normally?
04
(c) Derive an expression for equivalent resistances of a star connected
network to transform into a Delta connected network.
07
Q.2 (a) State Thevenin?s and Norton?s Theorems. 03
(b) Compare series and parallel resonance in ac circuit. 04
(c) A single phase R-L-C circuit having resistance of 8?, inductance of
80mH and capacitance of 100?F is connected across single phase ac
150 V , 50Hz supply. Calculate the current, power factor and voltage
drop across inductance and capacitance.
07
OR
(c) Derive an expression for the voltage across the capacitor during
charging through the resistor at any instant V
c
= V(1-e
-t/RC
). Assume
that RC series circuit is connected across a DC supply of voltage V.
07
Q.3 (a) Define the following terms in connection with AC waveforms:-
1. Q-Factor 2. Power Factor
3.Form factor.
03
(b) Draw impedance triangle, Voltage triangle, Power triangle for single
phase R-L series circuit.
04
(c) Derive the relationship between Phase and Line values of voltages
and currents in case of 3-phase Star- connection.
07
OR
Q.3 (a) Define the terms:- 1. Real power 2. Reactive power 3. Apparent
power.
03
(b) Derive the EMF equation of single phase transformer. 04
(c) With neat circuit diagram and a phasor diagram prove that two watt
meters are sufficient to measure total power in 3-phase system.
07
Q.4 (a) Explain working principle of single phase Transformer. 03
(b) Give Merits, Demerits and Applications of Induction Motor. 04
(c) Explain in detail the construction of an Alternator. 07
OR
Q.4 (a) Explain working principle of D.C. Motor. 03
(b) Compare poly phase Induction Motor and single phase Induction
Motor.
04
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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? I & II (NEW) EXAMINATION ? WINTER 2019
Subject Code: 3110005 Date: 11/01/2020

Subject Name: Basic Electrical Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.


Marks

Q.1 (a) State Ohm?s law and Kirchhoff?s Laws in context with DC circuits. 03
(b) A 100V,60 Watt bulb is to be operated from a 220V supply. What is
the resistance to be connected in series with the bulb to glow
normally?
04
(c) Derive an expression for equivalent resistances of a star connected
network to transform into a Delta connected network.
07
Q.2 (a) State Thevenin?s and Norton?s Theorems. 03
(b) Compare series and parallel resonance in ac circuit. 04
(c) A single phase R-L-C circuit having resistance of 8?, inductance of
80mH and capacitance of 100?F is connected across single phase ac
150 V , 50Hz supply. Calculate the current, power factor and voltage
drop across inductance and capacitance.
07
OR
(c) Derive an expression for the voltage across the capacitor during
charging through the resistor at any instant V
c
= V(1-e
-t/RC
). Assume
that RC series circuit is connected across a DC supply of voltage V.
07
Q.3 (a) Define the following terms in connection with AC waveforms:-
1. Q-Factor 2. Power Factor
3.Form factor.
03
(b) Draw impedance triangle, Voltage triangle, Power triangle for single
phase R-L series circuit.
04
(c) Derive the relationship between Phase and Line values of voltages
and currents in case of 3-phase Star- connection.
07
OR
Q.3 (a) Define the terms:- 1. Real power 2. Reactive power 3. Apparent
power.
03
(b) Derive the EMF equation of single phase transformer. 04
(c) With neat circuit diagram and a phasor diagram prove that two watt
meters are sufficient to measure total power in 3-phase system.
07
Q.4 (a) Explain working principle of single phase Transformer. 03
(b) Give Merits, Demerits and Applications of Induction Motor. 04
(c) Explain in detail the construction of an Alternator. 07
OR
Q.4 (a) Explain working principle of D.C. Motor. 03
(b) Compare poly phase Induction Motor and single phase Induction
Motor.
04
2
(c) Explain Generation of Rotating Magnetic Field in 3-phase Induction
Motor with diagrams and equations.
07
Q.5 (a) Classify different types of cables with reference to voltage and
insulation materials.
03
(b) Explain the terms:- 1. Residual magnetism 2. Coercive Force. 04
(c) Explain the process of charging and discharging of Lead acid cell. 07
OR

Q.5 (a) Compare MCB and ELCB. 03
(b) Write safety precautions for electrical Applications. 04
(c) Explain different methods of power factor improvement. 07


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