Mahatma Gandhi University (MGU) 2010-2nd Sem B.Tech Mg university first &basic electrical engineering - Question Paper
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B.TECH. DEGREE EXAMINATION, MAY 2012
First and 2nd Semester
EN 010 107-BASIC ELECTRICAL ENGINEERING
(New Scheme)
(Regular/Improvement/Supplementary)
Time: 3hours [common to all branches] Maximum: 100 Marks
PART - A
ans all ques.. every ques. four marks
1. describe and discuss self inductance, mutual inductance and coefficient of coupling.
2. State and discuss Faradays laws of electromagnetic induction.
3. For a sinusoidally varying alternating current, obtain (1)RMS value (2)Average value and (3)Peak factor.
4. describe impedance and admittance. With necessary waveforms for a series RL networked, note that the current lags the applied voltage.
5. Derive the relationship ranging from line and phase voltages in a balanced star connected three-phase system.
6. compute line current and total power absorbed when 3 coils having resistance of 20 ohm and reluctance of eight ohm are connected in delta across 415V, 3-phase supply.
7. discuss the various kinds of losses in a transformer.
8. List and discuss various applications of an induction motor.
9. discuss the working principle of mercury vapour lamp.
10. What is the need of high voltage transmission? What advantages does it offer?
PART - B
ans either (a) or (b) part of every module.
every full ques. carries 12 marks
module 1
11. (a)-1: 3 resistors four ohm, six ohm and six ohm are connected i series to a battery terminal voltage of 12V. compute the current in the circuit, potential difference across every each resistor and power dissipated in every resistor.
(a)-2:Distinguish ranging from statically induced emf and dynamically induced emf., bring out their applications.
OR
(b) State and discuss Kirchhoffs laws. In the network shown in figure below, where a few voltage drops across a few resistors are shown. compute the values of V1 and V2 using KVL.
module 2
12.(a)-1: Derive an expression for RMS value of sinusoidal voltage.
(a)-2: compute the RMS value, form factor and peak factor of a periodic voltage having the subsequent values to the next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10,.....What value of a sine wave having the identical peak value?
OR
(b) A coil resistance 15 ohm and inductance 0.05 H is connected in parallel with a non- inductive resistor of 20 ohm. compute the current in every branch circuit and the total current when a voltage of 200V at 50 Hz is applied. Draw the phasor diagram.
module 3
13. (a)-1: Draw and discuss the graph to define the variations of resistance , XL and XC of a series RLC circuit.
(a)-2: A choke coil of 20 ohm resistance and 0.1H inductance is connected in series with a capacitor of 200 microfarad capacitance. compute (1). the current (2). the coil voltage and (3) the capacitor voltage. The supply voltage is 230V and 50Hz.
OR
(b) A 220V, 3-phase voltage is applied to a balanced delta connected 3-phase load of phase impedance (15+j20)ohms.calculate Phasor current in every line, power consumed per phase, phasor sum of 3 line currents and its cause.Also draw its phasor diagram.
Module 4
14. (a)-1: Show that a rotating magnetic field can be produced by the use of a 3 phase current of equal magnitude and discuss how this principle of rotating field is applied to the case of an induction motor?
(a)-2: explain why the terminal voltages of a D.C generator falls as the current supplied by it increases.
OR
(b)-1: With neat sketches, discuss the construction of any 1 kind of a 1 phase transformer. Derive the emf formula.
(b)-2: With neat sketches discuss the working of a D.C motor.
module 5
15. (a)-1: With neat sketches, discuss the working of a fluorescent lamp.
(a)-2: Neatly sketch the wiring diagram of a room, having 1 2 way switch controlled lamp, 1 florescent lamp, ceiling fan and a power plug.
OR
(b)-1: Clearly define how electric power generated in a thermal power plant is transmitted over a distance of above 50Km and distributed to the consumers.
(b)-2: Compare the overhead and underground system of electrical power distribution.
ans all ques.. every ques. four marks
1. describe and discuss self inductance, mutual inductance and coefficient of coupling.
2. State and discuss Faradays laws of electromagnetic induction.
3. For a sinusoidally varying alternating current, obtain (1)RMS value (2)Average value and (3)Peak factor.
4. describe impedance and admittance. With necessary waveforms for a series RL networked, note that the current lags the applied voltage.
5. Derive the relationship ranging from line and phase voltages in a balanced star connected three-phase system.
6. compute line current and total power absorbed when 3 coils having resistance of 20 ohm and reluctance of eight ohm are connected in delta across 415V, 3-phase supply.
7. discuss the various kinds of losses in a transformer.
8. List and discuss various applications of an induction motor.
9. discuss the working principle of mercury vapour lamp.
10. What is the need of high voltage transmission? What advantages does it offer?
PART - B
ans either (a) or (b) part of every module.
every full ques. carries 12 marks
module 1
11. (a)-1: 3 resistors four ohm, six ohm and six ohm are connected i series to a battery terminal voltage of 12V. compute the current in the circuit, potential difference across every each resistor and power dissipated in every resistor.
(a)-2:Distinguish ranging from statically induced emf and dynamically induced emf., bring out their applications.
OR
(b) State and discuss Kirchhoffs laws. In the network shown in figure below, where a few voltage drops across a few resistors are shown. compute the values of V1 and V2 using KVL.
module 2
12.(a)-1: Derive an expression for RMS value of sinusoidal voltage.
(a)-2: compute the RMS value, form factor and peak factor of a periodic voltage having the subsequent values to the next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10,.....What value of a sine wave having the identical peak value?
OR
(b) A coil resistance 15 ohm and inductance 0.05 H is connected in parallel with a non- inductive resistor of 20 ohm. compute the current in every branch circuit and the total current when a voltage of 200V at 50 Hz is applied. Draw the phasor diagram.
module 3
13. (a)-1: Draw and discuss the graph to define the variations of resistance , XL and XC of a series RLC circuit.
(a)-2: A choke coil of 20 ohm resistance and 0.1H inductance is connected in series with a capacitor of 200 microfarad capacitance. compute (1). the current (2). the coil voltage and (3) the capacitor voltage. The supply voltage is 230V and 50Hz.
OR
(b) A 220V, 3-phase voltage is applied to a balanced delta connected 3-phase load of phase impedance (15+j20)ohms.calculate Phasor current in every line, power consumed per phase, phasor sum of 3 line currents and its cause.Also draw its phasor diagram.
Module 4
14. (a)-1: Show that a rotating magnetic field can be produced by the use of a 3 phase current of equal magnitude and discuss how this principle of rotating field is applied to the case of an induction motor?
(a)-2: explain why the terminal voltages of a D.C generator falls as the current supplied by it increases.
OR
(b)-1: With neat sketches, discuss the construction of any 1 kind of a 1 phase transformer. Derive the emf formula.
(b)-2: With neat sketches discuss the working of a D.C motor.
module 5
15. (a)-1: With neat sketches, discuss the working of a fluorescent lamp.
(a)-2: Neatly sketch the wiring diagram of a room, having 1 2 way switch controlled lamp, 1 florescent lamp, ceiling fan and a power plug.
OR
(b)-1: Clearly define how electric power generated in a thermal power plant is transmitted over a distance of above 50Km and distributed to the consumers.
(b)-2: Compare the overhead and underground system of electrical power distribution.
-4-L W HI
IV
10V
IV
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| Earning: Approval pending. |
