Exam Details
| Subject | Basics Of Electrical Engineering | |
| Paper | ||
| Exam / Course | B.Tech. VIEP- Electrical Engineering III (BTCSVI/BTECVI/BTELVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2015 | |
| City, State | new delhi, |
Question Paper
1. State whether the following statements are True or False:
In parallel combination, the equivalent resistance is less than the least among the resistors.
Norton's theorem reduces a given complicated network to a simple parallel circuit.
Reluctance in a magnetic circuit is analogous to resistance in an electric circuit.
As compared to constant current method of charging a cell, the constant voltage charging method takes much longer time.
The direction of the e.m.f. induced in a conductor is given by Fleming's left-hand rule.
Mutual induction between the coils is dependent on the number of turns of both coils.
Hysteresis loss cannot occur in non-magnetic materials.
The power factor of the RLC circuit varies between zero and unity, lag or lead.
The unit of admittance, conductance and susceptance is Siemens.
Two-wattmeter method gives true power in a 3-phase system only if it is balanced.
Using Norton's theorem, determine the current in the 12 ohm resistor in the following network.
<img src='./qimages/15538-2a.jpg'>
State and explain Kirchhoff's current and voltage laws.
Distinguish between primary and secondary cells.
Explain the construction and working of a lead acid storage battery.
Derive an expression for the field strength at the centre of a long solenoid of turns having a length of metres and carrying a current amperes.
Define the terms m.m.f., magnetic flux and magnetic reluctance and establish the relation which holds between these quantities for a magnetic circuit.
Two air-cooled coils are placed close to each other so that 80% of the flux of one coil links with the other. Each coil has a mean diameter of 2 cm and a mean length of 50 cm. If there are 1800 turns of wire on one coil, calculate the number of turns on the other coil to give a mutual inductance of 15 mH.
State and explain Faraday's law of electromagnetic induction.
Explain why the series resonant circuit is often regarded as the acceptor circuit and the parallel circuit as the rejector circuit.
A coil of resistance 10 ohm and inductance 0·1 H is connected in series with a condenser of capacitance 150 MF across a 200 50 Hz supply. Determine
impedance
current
power factor
voltage across the coil.
Develop an expression for the total power in a balanced 3-phase load.
Three similar coils each having a resistance of 15 ohm and an inductance of 0·04 Henry are connected in star to a 3-phase 50 Hz supply, 200 volts between lines. Calculate the current. If they are now connected in delta, calculate the phase current, line current and the total power absorbed in each phase.
8. Write short notes on any two of the following:
Advantages of 3-phase system over I-phase system
Lenz's law
Superposition theorem
Rise and decay of current in RC circuits
In parallel combination, the equivalent resistance is less than the least among the resistors.
Norton's theorem reduces a given complicated network to a simple parallel circuit.
Reluctance in a magnetic circuit is analogous to resistance in an electric circuit.
As compared to constant current method of charging a cell, the constant voltage charging method takes much longer time.
The direction of the e.m.f. induced in a conductor is given by Fleming's left-hand rule.
Mutual induction between the coils is dependent on the number of turns of both coils.
Hysteresis loss cannot occur in non-magnetic materials.
The power factor of the RLC circuit varies between zero and unity, lag or lead.
The unit of admittance, conductance and susceptance is Siemens.
Two-wattmeter method gives true power in a 3-phase system only if it is balanced.
Using Norton's theorem, determine the current in the 12 ohm resistor in the following network.
<img src='./qimages/15538-2a.jpg'>
State and explain Kirchhoff's current and voltage laws.
Distinguish between primary and secondary cells.
Explain the construction and working of a lead acid storage battery.
Derive an expression for the field strength at the centre of a long solenoid of turns having a length of metres and carrying a current amperes.
Define the terms m.m.f., magnetic flux and magnetic reluctance and establish the relation which holds between these quantities for a magnetic circuit.
Two air-cooled coils are placed close to each other so that 80% of the flux of one coil links with the other. Each coil has a mean diameter of 2 cm and a mean length of 50 cm. If there are 1800 turns of wire on one coil, calculate the number of turns on the other coil to give a mutual inductance of 15 mH.
State and explain Faraday's law of electromagnetic induction.
Explain why the series resonant circuit is often regarded as the acceptor circuit and the parallel circuit as the rejector circuit.
A coil of resistance 10 ohm and inductance 0·1 H is connected in series with a condenser of capacitance 150 MF across a 200 50 Hz supply. Determine
impedance
current
power factor
voltage across the coil.
Develop an expression for the total power in a balanced 3-phase load.
Three similar coils each having a resistance of 15 ohm and an inductance of 0·04 Henry are connected in star to a 3-phase 50 Hz supply, 200 volts between lines. Calculate the current. If they are now connected in delta, calculate the phase current, line current and the total power absorbed in each phase.
8. Write short notes on any two of the following:
Advantages of 3-phase system over I-phase system
Lenz's law
Superposition theorem
Rise and decay of current in RC circuits
Other Question Papers
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Subjects
- Active Filter Design
- Advanced Control System
- Advanced Power Electronics
- Applied Electromagnetics
- Basics Of Electrical Engineering
- Computer Process Control
- Control System
- Digital Electronics
- Electric Energy Utilization
- Electrical And Electronics Engineering Materials
- Electrical Instrumentation
- Electrical Machine - I
- Electrical Machines - Ii
- Electrical Machines And Electronics
- Electrical Measurements And Measuring Instruments
- Electro Mechanical Energy Conversion - I
- Electro-Mechanical Energy Conversion - Ii
- Electro-Mechanical Energy Conversion-Iii
- Electromagnetic Theory
- Energy Auditing And Analysis
- High Voltage Engineering
- Industrial Drives
- Micro Controllers
- Microprocessor And Applications
- Network Theory
- Power Quality Issues And Remedial Measures
- Power System
- Power System - I
- Stochastic Control Systems
- Switchgear And Protection