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 | December, 2015 | |
| City, State | new delhi, |
Question Paper
1. State whether the following statements are True or False:
Non-linear resistors do not obey Ohm's law.
Superposition theorem can be applied to those circuits which contain voltage sources only.
Relative permeability of a material increases with increase in the flux density established in it.
The capacity of a cell is measured in watt hours.
Induced e.m.f. can be either mutually' induced or statically induced.
The magnitude of the e.m.f. induced in a circuit depends on the change of flux linkages.
For a given current, energy stored in the magnetic field of a coil depends on the square of its turns.
An circuit has maximum impedance under resonant conditions.
A parallel a.c. circuit draws maximum current when in resonance.
Two-wattmeter method can be used for measuring reactive power.
In the network shown below, determine the resistance between A and B. The numbers represent the respective resistances in ohms.
<img src='./qimages/13186-2a.jpg'>
What do you understand by temperature coefficient of resistance? Specify its units. Narne five materials whose resistance decreases with rise in temperature.
Explain the constant current and constant voltage method of charging a battery. Which method is employed commercially?
Explain the care and maintenance of lead acid battery. Also state its applications.
Explain the terms
magnetic intensity,
magnetic flux density,
permeability, and
magnetic flux.
Explain hysteresis loss and the importance of hysteresis loop.
The self-inductance of a coil of 500 turns is 0·25 H. If 60% of the flux is linked with a second coil of 10000 turns, calculate
the mutual inductance of the two coils, and
the e.m.f. induced in the second coil, when the current in the first coil changes at the rate of 100 Ns.
Define the coefficient of coupling and show that
k M/sqrt(L1L2)
Show that the r.m.s. value of a sinusoidal a.c. voltage of amplitude Vm is Vm sqrt(2).
A coil of 18 Q resistance and 0·3 H inductance is connected in parallel with a variable capacitor across a 230 50 Hz supply. Calculate
the capacitance of the capacitor for resonance condition,
the effective impedance of the circuit, and
the current supplied from the mains.
Explain the two-watt method to measure power in a 3-phase unbalanced load.
Three equal impedances each having a resistance of 8 ohms and inductive reactance of 6 ohms are connected in
star, and
delta, across a 3-phase 440 V system.
Find the
phase current,
line current
total power consumed.
8. Write short notes on any two of the following:
Kirchhoffs Current and Voltage Law
Thevenin's Theorem
Power Factor and its improvement
Ohm's Law
Non-linear resistors do not obey Ohm's law.
Superposition theorem can be applied to those circuits which contain voltage sources only.
Relative permeability of a material increases with increase in the flux density established in it.
The capacity of a cell is measured in watt hours.
Induced e.m.f. can be either mutually' induced or statically induced.
The magnitude of the e.m.f. induced in a circuit depends on the change of flux linkages.
For a given current, energy stored in the magnetic field of a coil depends on the square of its turns.
An circuit has maximum impedance under resonant conditions.
A parallel a.c. circuit draws maximum current when in resonance.
Two-wattmeter method can be used for measuring reactive power.
In the network shown below, determine the resistance between A and B. The numbers represent the respective resistances in ohms.
<img src='./qimages/13186-2a.jpg'>
What do you understand by temperature coefficient of resistance? Specify its units. Narne five materials whose resistance decreases with rise in temperature.
Explain the constant current and constant voltage method of charging a battery. Which method is employed commercially?
Explain the care and maintenance of lead acid battery. Also state its applications.
Explain the terms
magnetic intensity,
magnetic flux density,
permeability, and
magnetic flux.
Explain hysteresis loss and the importance of hysteresis loop.
The self-inductance of a coil of 500 turns is 0·25 H. If 60% of the flux is linked with a second coil of 10000 turns, calculate
the mutual inductance of the two coils, and
the e.m.f. induced in the second coil, when the current in the first coil changes at the rate of 100 Ns.
Define the coefficient of coupling and show that
k M/sqrt(L1L2)
Show that the r.m.s. value of a sinusoidal a.c. voltage of amplitude Vm is Vm sqrt(2).
A coil of 18 Q resistance and 0·3 H inductance is connected in parallel with a variable capacitor across a 230 50 Hz supply. Calculate
the capacitance of the capacitor for resonance condition,
the effective impedance of the circuit, and
the current supplied from the mains.
Explain the two-watt method to measure power in a 3-phase unbalanced load.
Three equal impedances each having a resistance of 8 ohms and inductive reactance of 6 ohms are connected in
star, and
delta, across a 3-phase 440 V system.
Find the
phase current,
line current
total power consumed.
8. Write short notes on any two of the following:
Kirchhoffs Current and Voltage Law
Thevenin's Theorem
Power Factor and its improvement
Ohm's Law
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