EEE101 Basic Electrical Engineering B.Tech Question Paper : tmu.ac.in

University : Teerthanker Mahaveer University
College : Teerthanker Mahaveer College of Engineering
Degree : B.Tech
Subject :EEE101 Basic Electrical Engineering
Semester : I
Document Type : Question Paper
Website : tmu.ac.in

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Basic Electrical Engineering :

B.Tech. I SEMESTER EXAMINATION 2010-11
Course Code : EEE101
Paper ID: 0212106

Related : Teerthanker Mahaveer Medical College & Research Centre EEC101 Basic Electronics Engineering B.Tech Question Paper : www.pdfquestion.in/5768.html

Time : 3 Hours
Max. Marks: 75
Note : Attempt six questions in all. Q. No. 1 is compulsory.
1. Answer any five of the following (limit your answer in 50 words). (3×5=15)
a) Why are the A.C. quantities expressed in R.M.S. values and not in average values-
b) What is the reactance of 100µF capacitor at (i) A.C. supply of 50Hz (ii) D.C. supply.

c) What do you understand by active and reactive component of current in an A.C. circuit-
d) Why are the moving iron instruments popular for measurement of current and voltage-
e) What will be the power factor, if one wattmeter reads zero in two wattmeter method-

f) What happens when the transformer is connected to the D.C. supply-
g) Why D.C. series motor should never be started at no load-
h) Why rotor of an induction motor can never attain synchronous speed.

2. State and prove maximum power transfer theorem. Find the maximum possible efficiency in this case. (12)
3. Using Norton’s theorem, find the current in resistance of 50 in given circuit and verify your answer with Theyenin theorem. (12)

4. Derive the relationship between resonant frequency and half power frequencies in R-L-C series circuit. (12)
5. Explain two wattmeter method for three phase power measurement and
derive the relation. (12)

6. How the iron loss and copper loss are measured in transformer- (12)
7. Explain the principal of operation of three phase induction motor. Draw and explain the torque and slip characteristic. (12)

8. Compare the synchronous motor with three phase induction motor. Why synchronous motor runs with lagging and leading power factor. (12)

B.Tech I (First) Semester Examination 2015-16 :
Course Code : EEE101
Paper ID : 0962407
Time : 3 Hours
Max. Marks : 70
Max Marks : 75
Note : Attempt six questions in all. Q. No. 1 is compulsory.
1. Answer any five of the following (limit your answer to 50 words). (4×5=20)
a) Explain the concepts of ideal voltage source and ideal current source.
b) Explain the significance of maximum power transfer theorem for practical applications.

c) For a sinusoidal function, define
i) Instantaneous value ii) Peak value
iii) Cycle iv) Frequency
d) For ac circuits, explain the difference between actual power and apparent power.

e) For a series RLC circuit draw the phasor diagram
f) Define and explain quality factor of a resonant circuit.
g) Define an ideal transformer.
h) Explain the concept of ‘Slip’ in induction motor.

2. a) Distinguish between absolute instruments and secondary instruments. (4)
b) A meter movement with full scale deflection current of 100 µA and internal resistance of 100 Ω is required to measure a maximum current of 10 mA. Determine the shunt resistance needed. (6)

3. The armature of an eight pole dc generator has 480 conductors. The magnetic phase and speed of rotation are such that the average emf generated in each conductor is 2.1 V and each conductor is capable of carrying a full load current of 200 A.

Calculate the terminal voltage on no load, the output current on full load and the total power generated on full load, when the armature is (10) i) lap-wound ii) wave wound

4. a) Explain different rotor constructions for a three phase induction motor. (4)
b) A 3-phase, 6 pole, 50 Hz induction motor has a slip of 1% at no load and of 3% at full load- Find (6)
i) the synchronous speed
ii) the no load speed
iii) the full load speed
iv) the frequency of rotor currents

5. Draw the equivalent circuit and phasor diagram of a practical transformer on load. (10)
6. Derive the expesiion for frequency of resonance in a series RLC circuit. Draw the plots of and versus frequency. (10)

7. A metal filament lamp, rated at 750 W, 100 V is to be used on a 230 V, 50 Hz supply by connecting a capacitor of suitable value in series. Determine (2×5=10)
a) the capacitance required
b) the phase angle
c) the power factor
d) the apparent power
v) the reactive power

8. By using Thevenin’s theorem, determine the voltage across the load resistance RL in figure