Question No. 01: What is Q factor?
Answer: The Q factor is ratio of
inductive reactance to resistance of a coil.
Question No. 02: List examples of
current sources?
Answer: Semiconductor devices
like transistor and diode are treated as current sources.
Question No. 03: State Norton’s
theorem?
Answer: This theorem states that
any linear bilateral network with active network with output terminals AB can
be replaced by a single current source in parallel with a single impedance Z.
Question No. 04: What is the
efficiency during maximum power transfer?
Answer: Efficiency during
maximum power transfer 50%.
Question No. 05: Define filter?
Answer: A filter is an
electrical network that can transmit signals within a specified frequency
range.
Question No. 06: Define active
filter?
Answer: The active filter
contains components like operational amplifier that introduce some gain in the
signal.
Question No. 07: How a band pass
filter is constructed?
Answer: This filter is a
combination of two parallel tuned circuits. This is a special type of LC filter
along with a particular BW frequency to be allowed through it.
Question No. 08: What is resistance?
Answer: The resistance is the
property of a material to oppose the flow of current in a material. Its unit is
ohm.
Question No. 09: What happens to
voltage when current is zero?
Answer: The voltage is constant.
Question No. 10: Which capacitor is
preferred for high voltage and frequency?
Answer: The vacuum and gas
filled capacitor are used for high voltage and frequency applications.
Question No. 11: State Kirchoff’s
voltage law?
Answer: Kirchoff’s voltage law
states that the algebraic sum of all branch voltages around any closed loop of
a network is zero at all instant of time.
Question No. 12: What is the
limitation of Kirchoff’s law?
Answer: It fails in distributed
parameter network.
Question No. 13: Sate Maximum power
transfer theorem?
Answer: A resistance load being
connected to a dc network receives maximum power when load resistance is equal
to internal resistance.
Question No. 14: Define
characteristics impedance?
Answer: The characteristics
impedance of a filter matches with circuit to which it is connected throughout
the pass band.
Question No. 15: List the
disadvantages of constant K filters?
Answer: The attenuation does not
increase rapidly beyond cut-off frequency. Characteristics impedance varies
widely in the pass band from desired value.
Question No. 16: What are the
materials used for resistor?
Answer: The materials used are:
- Manganin (alloy of copper, manganese and nickel. Copper86%, Manganese 12%, and Nickel 2%)
- Constantan (alloy of nickel and copper. Copper 55% and Nickel 45%).
Question No. 17: When we use
3-terminal resistor?
Answer: It is used when
resistance is less than 1 ohm.
Question No. 18: State Kirchoff’s
current law?
Answer: The algebraic sum of
currents at any node of a circuit is zero. The sum of incoming current is equal
to sum of outgoing current.
Question No. 19: How equivalent
impedance is calculated in Thevenin Theorem?
Answer: All independent voltage
sources are short circuited and all independent current sources are open
circuited.
Question No. 20: State Superposition
theorem
Answer: If a number of voltages
or current sources are acting simultaneously in a linear network the resultant
current in any branch is the algebraic sum of current that would be produced in
it when each source acts alone replacing all other independent sources by their
internal resistances.
Question No. 21: Define unilateral
circuit?
Answer: The circuit whose
properties are not same in either direction is known as unilateral circuit.
Question No. 22: What are the
applications of filter?
Answer: The Filter is used in
voice frequency telegraphy, multi channel communication, TV broadcasting and
telephony.
Question No. 23: What is inductance?
Answer: It is the property of a
material by virtue of which it opposes any change of magnitude and direction of
current passing through the conductor.
Question No. 24: What are the
properties of a resistor?
Answer: The properties are high
resistivity, resistance to oxidation, corrosion and moisture.
Question No. 25: State Thevenin
Theorem?
Answer: This theorem states that
any linear network with output terminal AB can be replaced by a single voltage
source V in series with a single impedance.
Question No. 26: Define active and
passive network?
Answer:
Active network: The network which has
no current or voltage source is called passive network.
Passive network: The network which
either has current or voltage source is called active network.
Question No. 27: List the
characteristics of filter?
Answer: An ideal filter would
transmit signals under the pass-band frequencies without attenuation and
completely suppress the signal with attenuation band of frequencies with a
sharp cut-off profile.
Question No. 28: Define cut-off
frequency?
Answer: The frequency that
separates the pass and attenuation band is known as cut-off frequency.
Question No. 29: What happens to
voltage when current through the inductor is constant?
Answer: The voltage across
inductor is zero.
Question No. 30: What is the
material used for inductance coil?
Answer: The material used is
marble because it is unaffected by atmospheric conditions.
Question No. 31: Is the theorem
applicable to a.c. sources?
Answer: No, it is applicable to
dc circuits with and without controlled sources.
Question No. 32: State Ohm’s Law?
Answer: The current through any
conductor is directly proportional to the applied potential difference across
it keeping physical condition unchanged.
Question No. 33: What are dependent
sources?
Answer: When strength of voltage
or current changes in the source for any change in the connected network they
are called dependent sources.
Question No. 34: How will you define
capacitance?
Answer: It is the ability to
store electric charge within it. Capacitance is a measure of charge per unit
voltage that can be stored in an element.
Question No. 35: Define Norton
equivalent circuit?
Answer: The Norton equivalent
circuit is a current generator which is placed in parallel to internal
resistance.
Question No. 36: What is the unit of
charge and current?
Answer: The units are coulomb
and ampere.
Question No. 37: List examples of
voltage source?
Answer: The examples of voltage
source are battery and generator.
Question No. 38: Define branch?
Answer: It is a part of a
network which lies between two junction points.
Question No. 39: What is the unit of
attenuation?
Answer: The unit is decibel and
neper.
Question No. 40: List advantages of
active filter over passive filter?
Answer: Active filter eliminate
bulky components. It offers gain. It can drive low impedance loads. It is easy
to tune.