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Posted Date: 14 Aug 2009 Posted By: ananth Member Level: Gold
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2009 Jawaharlal Nehru Technological University Code No: R05010501 Set No. 1 I B.Tech Semester Supplimentary Examinations, June 2009 BASIC ELECTRICAL ENGINEERING ( Common to Civil Engineering, Electrical & Electronic Engineering, Mechanical Engineering, Electronics & Communication Engineering) Question paper
Code No: R05010501 Set No. 1
I B.Tech Semester Supplimentary Examinations, June 2009
BASIC ELECTRICAL ENGINEERING
( Common to Computer Science & Engineering, Information Technology
and Computer Science & Systems Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) State and Explain Ampere’s force law?
(b) State and explain Faradays laws of Electromagnetic induction?
(c) A wire of length 50 cm moves at right angle to its length at 40 met./sec. in a
uniform magnetic field density of 1.5 wb/m
2 (Tesla). Calculate the magnitude
of e.m.f induced in the conductor when the direction of motion is perpendicular
to the field? [6+6+4]
2. Using Thevenin’s theorem calculate the current I through the resistance connected
between the terminal A & B (All resistances are in ohms).3. (a) Define the terms
i. Magnetic flux
ii. Magnetic flux density
iii. Magneto motive force
iv. Reluctance.
(b) The air gap in a magnetic circuits is 1.5 mm long and 2500 mm
2 in cross
sectional area. Calculate
i. the reluctance of the air gap
ii. the m.m.f required to set up a flux of 800 ×10-6 wb. in the air gap.[8+8]
4. Three branches possessing a resistance of 50 Ohms an inductance of 0.15 Henrys;
and a capacitance of 100 µF respectively connected in parallel across a 100V, 50
Hz. supply as shown in figure 4: Calculate(a) The Current in each branch
(b) The Supply current
(c) The phase angle between supply voltage and supply current5. (a) Define voltage regulation of a transformer. Deduce the expression for the
voltage regulation.
(b) The number of turns on the primary and secondary windings of a single phase
transformer are 350 and 35 respectively. If the primary is connected to a 2.2
KV 50 HZ supply determine the secondary voltage. [8+8]
6. Explain constructional features and working principles of DC generator. [16]
7. (a) Explain the working principle of three phase induction motor.
(b) A 6 pole induction motor is fed by three phase 50 HZ supply and running with
a full load slip of 3%. Find the full load speed of induction motor and also
the frequency of rotor emf. [8+8]
8. Explain the following with reference to the indicating instruments
(a) Deflecting torque
(b) Controlling torque
(c) Damping torque
(d) Scale and pointer
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