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Nehru Arts and Science College, Coimbatore.
Department of Electronics and Communication System
Question Bank
Sem – I
Subject : Basic Electronics
Class : I B.Sc ECS
UNIT - I
Section A
1.Ohm's law, if voltage increases and resistance stays the same:
(1) current remains the same (2) power decreases (3) current increases
2
3
4
5
6
7
Which formula shows a direct proportionality between power and voltage?
(1) V = IR (2) P = VI (3) P = IR
How is a 3.9 komega.gif resistor color-coded?
(1) red, white, red, gold (2) red, green, orange, silver (3) orange, white, red, gold
What resistor type is found in SIPs and DIPs?
(1) thick film (2) wirewound (3) metal film
Ohm's law is not:
(1) V = IR (2) I = V/R (3) R = IV
What are the two major categories for resistors?
(1) low and high ohmic value (2) fixed and variable (3) low and high power value
How many connections does a potentiometer have?
(1) 1 (2) 2 (3) 3
With Ohm's law:
8 (1) current is inversely proportional to resistance (2) resistance is directly proportional to
voltage (3) voltage is indirectly proportional to power
9
10
Power is defined as:
(1) watts (2) energy (3) the rate at which energy is used
A color code of orange, orange, orange is for what ohmic value?
(1) 22 kilohms (2) 33 kilohms (3) 3300 ohms
What is magnetic flux?
11 (1) the number of lines of force in webers (2) the number of lines of force in maxwells (3)
the number of lines of force in flux density
12
13
he electrical energy consumed by a coil is stored in the form of:
(1) an electrical field (2) a magnetic field (3) a force field
On a schematic, dashed lines between two vertical coils usually mean the transformer has:
(1) an air core (2) an iron core (3) a ferrite core
Faraday's law states that the:
14 (1) direction of the induced voltage produces an opposition (2) emf is related to the direction
of the current (3) emf depends on the rate of cutting flux
15
16
A magnetic field has:
(1) polar fields (2) lines of force (3) magnetomotive force
The four factors determining inductance are the number of turns, coil length, coil area, and:
(1) permeability (2) reluctance (3) coefficient of coupling
Electromagnetic induction is the generation of:
17 (1) electricity from magnetism (2) electricity from electricity (3) magnetism from
electricity
Inductance is:
18 (1) directly proportional to the length of the coil (2) directly proportional to the number of
turns on the coil (3) nversely proportional to the permeability
What term is used to describe the action of magnetic flux from one circuit that cuts across the
19 conductors of another circuit?
(1) self-inductance (2) rectification (3) mutual inductance
When a coil collapses the induced circuit current will:
20 (1) be in the same direction (2) go to zero (3) be in the opposite direction
21. The metal film resistors is very similar to the ____film resistor
(1) metal oxide (2) Thin oxide (3) Both
22. rheostat is a mechanical variable resistor with two connections is known as
(1)Rheostat (2) Carbon resistor (3) Metallic Resistor
23.____ are mechanical variable resistors with three connections.
(1) Potentiometers (2) Carbon resistor (3) Metallic Resistor
24. _____are conductors whose resistance value is affected by temperature.
(1) Thermistors (2) Carbon resistor (3) Metallic Resistor
25. _____ are normally used for high power and high inductance.
(1) Iron cores (2) air core (3) Ferrite core.
Section B
1. Explain about Carbon film resistor?
2. Discuss briefly about Metal film resistor?
3. Explain wire wound resistor?
4. What is thick film? Explain it.
5. What is color coding? Explain it
Section C
1. Explain the series and parallel circuit of inductor?
2. Explain briefly about variable resistor.
Unit-II
Section A
1 Select the equation below that represents the relationship between charge, capacitance, and
voltage for a capacitor.
(1) Q = CV (2) C = QV (3) V = IR
When a capacitor is fully charged?
(1) when the voltage across its plates is of the voltage from ground to one of its
2
plates (2) when the current through the capacitor is the same as when the
capacitor is discharged (3) when the voltage across the plates is 0.707 of the input
voltage
3
4
5
A capacitor's rate of charge is considered:
(1) magnetic (2) a current block (3) exponential
If an open capacitor is checked with an ohmmeter, the needle will:
(1) stay on zero (2) stay on infinity (3) move from infinity to zero
As a capacitor is being charged, current flowing into the capacitor will:
(1) increase (2) decrease (3) remain the same
A capacitor stores energy within a dielectric between the conducting plates in the
6
form of:
(1) a magnetic field (2) positive voltage (3) an electric field
7
As a capacitor is being charged, the voltage across its terminals will:
(1) increase (2) decrease (3) oppose the source
In an ac circuit, an output capacitor and a resistor are connected in series with an ac
8
signal. What filter action will be the result?
(1) bandpass (2) low-pass (3) high-pass
9
What is the total opposition to current in a series RC circuit called?
(1) impedance (2) inductance (3) reactance
Which of the following statements is true?
10
(1) The voltage to which a capacitor is charged can change instantaneously. (2) An
uncharged capacitor appears as a short to an instantaneous change in current.
(3) A fully charged capacitor appears as a short to dc current.
A capacitive circuit, current flow is limited to
11
(1) charging periods (2) discharging periods (3) both charging periods and
discharging periods
Which of the following determines the capacitance of a capacitor?
12
(1) Plate area, dielectric constant, and plate separation (2) Plate area, dielectric
strength, and plate separation (3) Temperature coefficient, plate area, and plate
separation
13
A capacitor is constructed of two parallel:
(1) conductors (2) semiconductors (3) inductors
Most older types of paper capacitors have been replaced by which type of
14
construction?
(1) electrolytic (2) plastic film (3) oxide casing
In a purely capacitive circuit,
15
(1) current leads voltage by 90° (2) voltage leads current by 90° (3) current lags
voltage by 90°
16
17
18
19
21.
If the dielectric constant of a capacitor is decreased, then its capacitance will:
(1) increase (2) decrease (3) remain the same
Capacitor value markings are usually:
(1) alphanumeric (2) color dabs (3) standard
The material used between the plates of a capacitor is called its:
(1) insulation material (2) dielectric material (3) separation material
Which material has the highest dielectric strength?
(1) Air (2) Paper (3) Mica
If a charged capacitor is disconnected from a circuit, it will
(1) immediately discharge (2) leak the charge (3) remain charged
22. Capacitors can be used to block ____
(1) DC (2) AC (3) Both
23. Dielectric Capacitors are ____type.
(1) Fixed (2) Variable (3) both
24. Electrolytic Capacitors are generally used in ____power supply circuits.
(1) DC (2) AC (3) both
25. ______capacitors are those in which the capacitance can be changed either mechanically or
electronically.
(1) Variable (2) Fixed (3) both
Section B
1.
2.
3.
4.
5.
Explain the basic function of capacitor?
Describe briefly about electrolytic capacitors?
Explain about plastic film capacitor
Write a short notes on paper capacitor?
Write a short notes on
i) Dielectric constant ii) permittivity
Section C
1. Describe the energy stored in capacitor with suitable diagram.
2. What is variable capacitor and explain it with types.
Unit - III
Section A
1. Kirchhoff s current law states that
(a) net current flow at the junction is positive
(b) Hebraic sum of the currents meeting at the junction is zero
(c) no curreht can leave the junction without some current entering it.
(d) total sum of currents meeting at the junction is zero
2. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any
closed loop of a network is always
(a)
negative
(b)
positive
(c) determined by battery e.m.fs.
(d) zero
3. Kirchhoffs current law is applicable to only
(a)
junction in a network
(b)
closed loops in a network
(c) electric circuits
(d) electronic circuits
4. Kirchhoffs voltage law is related to
(a) junction currents
(b) battery e.m.fs.
(c)
IR drops
(d) both (b) and (c)
5. Superposition theorem can be applied only to circuits having
(a) resistive elements
(b) passive elements
(c) non-linear elements
(d)
linear bilateral elements
6. The concept on which Superposition theorem is based is
(a) reciprocity
(b) duality
(c) non-linearity
(d) linearity
7. Thevenin resistance Rth is found
(a) by removing voltage sources along with their internal resistances
(6)
by short-circuiting the given two terminals
(c) between any two 'open' terminals
(d) between same open terminals as for Etk
8. An ideal voltage source should have
(a)
large value of e.m.f.
(b) small value of e.m.f.
(c) zero source resistance
(d) infinite source resistance
9. For a voltage source
(a) terminal voltage is always lower than source e.m.f.
(b) terminal voltage cannot be higher than source e.m.f.
(c) the source e.m.f. and terminal voltage are equal
10. To determine the polarity of the voltage drop across a resistor, it is necessary to know
(a)
value of current through the resistor
(b)
direction of current through the resistor
(c) value of resistor
(d) e.m.fs. in the circuit
11. "Maximum power output is obtained from a network when the load resistance is equal to the
output resistance of the network as seen from the terminals of the load". The above statement is
associated with
(a)
Millman's theorem
(b)
Thevenin's theorem
(c) Superposition theorem
(d) Maximum power transfer theorem
12. "Any number of current sources in parallel may be replaced by a single current source whose
current is the algebraic sum of individual source currents and source resistance is the parallel
combination of individual
source resistances".
The above statement is associated with
(a) Thevenin's theorem
(b) Millman's theorem
(c) Maximum power transfer theorem
(d) None of the above
13. "In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in
any other
branch, then same e.m.f. acting in the second branch would produce the same current / in the first
branch".
The above statement is associated with
(a) compensation theorem
(b) superposition theorem
(c) reciprocity theorem
(d) none of the above
14. Which of the following is non-linear circuit parameter ?
(a)
Inductance
(b)
Condenser
(c) Wire wound resistor
(d) Transistor
15. A capacitor is generally a
(a) bilateral and active component
(b) active, passive, linear and nonlinear component
(c) linear and bilateral component
(d) non-linear and active component
16. "In any network containing more than one sources of e.m.f. the current in any branch is the
algebraic sum of a number of individual fictitious currents (the number being equal to the
number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f.,
taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances
of which are equal to the internal resistances of the respective sources".
The above statement is associated with
(a)
Thevenin's theorem
(b)
Norton's theorem
(c) Superposition theorem
(d) None of the above
17. Kirchhoff s law is applicable to
(a) passive networks only
(b) a.c. circuits only
(c) d.c. circuits only
(d) both a.c. as well d.c. circuits
18. Kirchhoff s law is not applicable to circuits with
(a) lumped parameters
(b) passive elements
(c) distributed parameters
(d) non-linear resistances
19. Kirchhoff s voltage law applies to circuits with
(a) nonlinear elements only
(b) linear elements only
(c) linear, non-linear, active and passive elements
(d) linear, non-linear, active, passive, time varying as wells as time-in-variant elements
20. The resistance LM will be
(a) 6.66 Q
(b) 12 Q
(c) 18Q
(d) 20Q
21. For high efficiency of transfer of power, internal resistance of the source should be
(a) equal to the load resistance
(b) less than the load resistance
(c) more than the load resistance
(d) none of the above
22. Efficiency of power transfer when maximum transfer of power c xurs is
(a) 100%
(b) 80%
(c) 75%
(d) 50%
23. If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is
(a) 10 Q
(6) 20 Q
(c) 30 Q
(d) 40 Q
24. For maximum transfer of power, internal resistance of the source should be
(a) equal to load resistance
(b) less than the load resistance
(c) greater than the load resistance
(d) none of the above
25. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the
source will be
(a) a voltage source
(b) a current source
(c) both of above
(d) none of the above
Section B
1.
2.
3.
4.
Discuss briefly about EMF
What is potential difference? Explain it.
Discuss briefly about Kirchhoff's voltage law
Discuss briefly about Kirchhoff's current law
Section C
1. Explain briefly about voltage source
2. Explain briefly about current source
Unit - IV
Section A
26. The circuit whose properties are same in either direction is known as
(a)
unilateral circuit
(b)
bilateral circuit
(c) irreversible circuit
(d) reversible circuit
27. In a series parallel circuit, any two resistances in the same current path must be in
(a) series with each other
(b) parallel with each other
(c) series with the voltage source.'
(d) parallel with the voltage source
28. The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as
(a) non-linear circuit
(b) linear circuit
(c)
bilateral circuit
(d)
none of the above
29. A non-linear network does not satisfy
(a) superposition condition
(b) homogeneity condition
(c) both homogeneity as well as superposition condition
(d)
homogeneity, superposition and associative condition
30. An ideal voltage source has
(a) zero internal resistance
(b) open circuit voltage equal to the voltage on full load
(c)
terminal voltage in proportion to current
(d) terminal voltage in proportion to load
31. A network which contains one or more than one source of e.m.f. is known as
(a) linear network
(b) non-linear network
(c) passive network
(d) active network
32. The superposition theorem is applicable to
(a)
linear, non-linear and time variant responses
(b)
linear and non-linear resistors only
(c) linear responses only
(d) none of the above
33. Which of the following is not a nonlinear element ?
(a) Gas diode
(b) Heater coil
(c) Tunnel diode
(d) Electric arc
34. Application of Norton's theorem to a circuit yields
(a)
equivalent current source and impedance in series
(6)
equivalent current source and impedance in parallel
(c) equivalent impedance
(d) equivalent current source
35. Millman's theorem yields
(a)
equivalent resistance
(6)
equivalent impedance
(c) equivalent voltage source
(d) equivalent voltage or current source
36. The superposition theorem is applicable to
(a)
voltage only
(b)
current "only
(c) both current and voltage
(d) current voltage and power
37. Between the branch voltages of a loop the Kirchhoff s voltage law imposes
(a)
non-linear constraints
(b)
linear constraints
(c) no constraints
(d) none of the above
38. A passive network is one which contains
(a) only variable resistances
(b) only some sources of e.m.f. in it
(c) only two sources of e.m.f. in it
(d) no source of e.m.f. in it
39. A terminal where three on more branches meet is known as
(a) node
(b) terminus
(c) combination
(d) anode
40. Which of the following is the passive element ?
(a)
Capacitance
(b)
Ideal current source
(c) Ideal voltage source
(d) All of the above
41. Which of the following is a bilateral element ?
(a)
Constant current source
(b)
Constant voltage source
(c) Capacitance
(d) None of the above
42. A closed path made by several branches of the network is known as
(a) branch
(b) loop
(c) circuit
(d) junction
43. A linear resistor having 0 < R < °o is a
(a)
current controlled resistor
(6)
voltage controlled resistor
(c) both current controlled and voltage controlled resistor
(d) none of the above
44. A star circuit has element of resistance R/2. The equivalent delta elements will be
(a) R/6
(b) 3R
(c) 2R
(d) 4R
45. A delta circuit has each element of value R/2. The equivalent elements of star circuit with be
(a) 1R
(b) R/3
(c) 2R
(d) 3R
46. In Thevenin's theorem, to find Z
(a) all independent current sources are short circuited and independent voltage sources are open
circuited
(b) all independent voltage sources are open circuited and all independent current sources are
short circuited
(c) all independent voltage and current sources are short circuited
(d) all independent voltage sources are short circuited and all independent current sources
are open circuited
47. While calculating Rth in Thevenin's theorem and Norton equivalent
(a)
all independent sources are made dead
(b) only current sources are made dead
(c) only voltage sources are made dead
(d) all voltage and current sources are made dead
48. The number of independent equations to solve a network is equal to
(a)
the number of chords
(b)
the number of branches
(c) sum of the number of branches and chords
(d) sum of number of branches, chords and nodes
49. The superposition theorem requires as many circuits to be solved as there are
(a) sources, nodes and meshes
(b) sources and nodes
(c) sources
(d)
nodes
50. Choose the incorrect statement.
(a)
A branch formed by the parallel connection of any resistor R and open circuit has the
characteristic of an open circuit.
(b)
A branch formed by the parallel connection of any resistor R and a short circuit has the
characteristic of a short circuit.
(c) A branch formed by the series connection of any resistor R and an open circuit has the
characteristic of an open circuit.
(d) A branch formed by the series connection of any resistor R and a short circuit has the
characteristic of resistor R.
Section B
1. State the superposition theorem and discuss it
2. With neat diagram explain the function of Nortons theorem
3. Discuss the concept of Millimans theorem.
4. Explain briefly about Thevenins theorem
5. State maximum power transfer theorem and explain it.
Section C
1. Explain the voltage source and current source
2 .Explain the thevening bridge circuit
Unit- V
Section A
1. ____ Waves are fundamental in many areas of mathematics and science.
a) Sine b) Cos c) both d) none
2. In statistics, the root mean also known as ___
a) quadratic mean b) arithmetic mean c) both d) none
3.Rth Refers _____ resistance.
a)Thevinin b) Norton c) both d) none
4.Vth refers ____ voltage
a)Thevinin b) Norton c) both d) none
5.RN refers ____ resistance.
a)Thevinin b) Norton c) both d) none
6. Rth is same as ___
a) RN b)Rl c) both d) none
7. RMS means ___
a) Root Mean Square b) Root Measure Square c) Rule Measure Square d) none
8. LPF stands for
a) low pass filter b) low process filter c) low pass feature d) none
9. HPF Stands for
a) High pass filter b) High passed filter c) both d) none
10.___ filter is used to allow low frequency.
a) LPF b) HPF c) BPF d) BSF
11. .___ filter is used to allow low frequency.
a) LPF b) HPF c) BPF d) BSF
12. BPF is constructed using___
a) LPF b) HPF c) both d) none
13.Notch Filter is also called as ____
a) LPF b) HPF c) BPF d) BSF
14.Band reject filter is also called as ___
a) LPF b) HPF c) BPF d) BSF
15. To allow certain band of frequency __ filter is used.
a) LPF b) HPF c) BPF d) BSF
16. band-elimination is also known as___
a) LPF b) HPF c) BPF d) BSF
17.In filter fc refers___ frequency.
a) Cut off b) Critical c) both d) none
18. In filter fu refers___ cut off frequency.
a) upper b) lower c) medium d) none
19. . In filter fL refers___ cut off frequency.
a) upper b) lower c) medium d) none
20. Xc refers___
a) capacitive reactance b) inductive reactance c) both d) none
21. XL refers___
a) capacitive reactance b) inductive reactance c) both d) none
22.Filter is designed using__
a) Resistor b) capacitor c) inductor d) All
23.___ filter is designed by cascading” together a single Low Pass Filter circuit with a High Pass
Filter
a) LPF b) HPF c) BPF d) BSF
24.In which filter Resistor connected in series
a) a) LPF b) HPF c) BPF d) BSF
25. In which filter capacitor connected in series
a) LPF b) HPF c) BPF d) BSF
1.
2.
3.
4.
5.
Section B
Discuss briefly about Low Pass Filter.
With neat diagram explain High Pas Filter.
Explain about Band Pass Filter
Differentiate HPF and BPF.
Distinguish BSF and BPF
Section c
1. Explain briefly about BPF and notch filter.
2. Discuss briefly about series and parallel resonance circuit.