9294 + Mcqs in Electronics and Communication Engineering Page 114 McqOptions

5651.	In figure, the current I
A.	is 2 A from A to B
B.	is 2 A from B to A
C.	depends on the value of R
D.	none of the above
Answer» D. none of the above

Discussion

5652.	Consider the following statements Current through inductor cannot change abruptly.Voltage across capacitor cannot change abruptly.Initial value of f(t) is sF (s).Final value of f(t) is sF (s). Of the above statements
A.	3 and 4 are correct
B.	1 and 4 are correct
C.	1 and 2 are correct
D.	2 and 3 are correct
Answer» D. 2 and 3 are correct

Discussion

5653.	As B is increased from zero to about 2T, r, of a ferromagnetic material
A.	increase
B.	decrease
C.	first increases then decreases
D.	remains the same
Answer» D. remains the same

Discussion

5654.	Lead becomes a superconductor at
A.	9.1 K
B.	7 K
C.	5 K
D.	3 K
Answer» C. 5 K

Discussion

5655.	Mesh analysis is applicable __________ only.
A.	planar network
B.	non planar network
C.	a circuit which contains only current sources
D.	none
Answer» B. non planar network

Discussion

5656.	In the circuit shown the voltage Vs has a phase angle of __________ with respect to VL.
A.	120
B.	60
C.	-90
D.	0
Answer» C. -90

Discussion

5657.	The ideal voltmeter V of figure will read __________ volt.
A.	0
B.	10
C.	5
D.	1
Answer» C. 5

Discussion

5658.	The circuit of figure is generally employed as a
A.	bridge
B.	low-pass filter
C.	peaking network
D.	high-pass filter
Answer» C. peaking network

Discussion

5659.	As x is increased from - to , the function
A.	monotonically increases
B.	monotonically decreases
C.	increases to a maximum value and then decrease
D.	decreases to a minimum value and then increases
Answer» B. monotonically decreases

Discussion

5660.	In figure, the short circuit current through terminal AB will be
A.	1.5 A
B.	3 A
C.	2 A
D.	1 A
Answer» E.

Discussion

5661.	In a varistor, as the voltage increases beyond a certain value, its resistance
A.	rapidly increases
B.	rapidly decreases
C.	becomes negative, i.e., varistor goes into negative resistance region
D.	none of these
Answer» C. becomes negative, i.e., varistor goes into negative resistance region

Discussion

5662.	Current through a charging capacitor exhibits
A.	an exponential growth function
B.	an exponential decay function
C.	a step decay function
D.	a linear decay function
Answer» D. a linear decay function

Discussion

5663.	A battery charger can drive a current of 5A with 1&ohm; resistance connected at its output. If it can charge 2 V battery at 7 A rate, its Thevenin's equivalent circuit will be
A.	7.5 in series with 0.5 &ohm; resistance
B.	1.25 V in series with 1.5 &ohm; resistance
C.	7.5 V in parallel with 0.5 &ohm; resistance
D.	12.5 V in parallel with 1.5 &ohm; resistance
Answer» B. 1.25 V in series with 1.5 &ohm; resistance

Discussion

5664.	For the given circuit, the current I is
A.	2 A
B.	5 A
C.	7 A
D.	8 A
Answer» D. 8 A

Discussion

5665.	A two terminal black box contains one of the elements R, L, C. The black box is connected to 220 V as supply. The current is I, when a capacitance of 0.1 F is connected in series between the source and box, the current is 2I. The elements is
A.	resistance
B.	inductance
C.	capacitance of 0.5 F
D.	not identifiable form the given data
Answer» C. capacitance of 0.5 F

Discussion

5666.	Which of the following graphs in figure correctly represents the variation of capacitive reactance with frequency?
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/149-1065-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/149-1065-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/149-1065-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/149-1065-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/149-1065-4.png">

Discussion

5667.	If Z(s) is positive real, then where k has only positive real values is also positive real. This hypothesis was first given by
A.	O'Brune
B.	R. Richards
C.	Bott and Duffin
D.	P. S. Laplace
Answer» C. Bott and Duffin

Discussion

5668.	For a voltage transfer function H(s), realizable by RLC network, the following statements are made H(s) cannot have a pole at s = 0H(s) cannot have a pole at s = j4H(s) cannot have a pole at s = H(s) cannot have a pole at s = + 2 Of these statements
A.	3 and 4 are correct
B.	2 and 4 are correct
C.	1 and 2 are correct
D.	1 and 3 are correct
Answer» B. 2 and 4 are correct

Discussion

5669.	For a series resonant circuit at low frequency impedance is __________ and at high frequency circuit impedance is __________ .
A.	capacitive, inductive
B.	inductive, capacitive
C.	resistive, inductive
D.	capacitive, resistive
Answer» B. inductive, capacitive

Discussion

5670.	Consider the following expression for the driving point impedance It represent on LC circuitIt represent on RLC circuitIt has poles lying on the j axisIt has a pole at infinite frequency and a zero at zero frequency. Which one fo the statement given above are correct?
A.	2 and 4
B.	1 and 3
C.	1 and 4
D.	2 and 3
Answer» C. 1 and 4

Discussion

5671.	If Y(s) = 1 + s, the network has
A.	1 &ohm; resistor and 1 F capacitor in series
B.	1 &ohm; resistor and 1 F capacitor in parallel
C.	1 &ohm; resistor and 1 H inductor in series
D.	1 &ohm; resistor and 1 H inductor in parallel
Answer» C. 1 &ohm; resistor and 1 H inductor in series

Discussion

5672.	The response shown in figure is
A.	over damped
B.	critically damped
C.	under damped
D.	either (a) or (c)
Answer» D. either (a) or (c)

Discussion

5673.	Assertion (A): A graph is planar if it has a dual.Reason (R): The dual of a graph can be found by window dot method.
A.	Both A and R are true and R is correct explanation of A
B.	Both A and R are true and R is not the correct explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» D. A is false but R is true

Discussion

5674.	For 200V r.m.s. value triangular wave, the peak voltage will be
A.	200 V
B.	222 V
C.	280 V
D.	346 V
Answer» E.

Discussion

5675.	According to initial value theorem which one is correct
A.	1, 4
B.	2, 3
C.	4, 2
D.	1, 2
Answer» E.

Discussion

5676.	For any given two port network, any parameter set can be determined from measurements made at the two ports.
A.	True
B.	False
Answer» B. False

Discussion

5677.	In carbon resistor colour code, the fourth band indicates tolerance.
A.	True
B.	False
Answer» B. False

Discussion

5678.	For a full rectified sine wave, the form factor and peak factor respectively are
A.	1.57 and
B.	<span class="root">2</span>
C.	1.57 and 2
D.	1.11 and 1.11
E.	1.11 and 2
Answer» D. 1.11 and 1.11

Discussion

5679.	For an RC admittance function Y,
A.	Y( ) < Y(0)
B.	Y(0) < Y( )
C.	Y ( ) may be lesser or greater than Y(0)
D.	Y( ) = Y(0)
Answer» C. Y ( ) may be lesser or greater than Y(0)

Discussion

5680.	Power factor of the following circuit will be unity
A.	inductance
B.	capacitance
C.	resistance
D.	both (a) and (b)
Answer» D. both (a) and (b)

Discussion

5681.	The voltage of single phase supply to residential consumers in India is
A.	400 V
B.	230 V
C.	2.2 kV
D.	11 kV
Answer» C. 2.2 kV

Discussion

5682.	When ac current is zero, no electrons are in motion.
A.	True
B.	False
Answer» B. False

Discussion

5683.	In the transformer shown in figure, the inductance measured across terminal 1 and 2 was 4 H with terminals 3 and 4 open. It was 3H when terminals 3 and 4 are short circuited. The coefficient of coupling is
A.	1
B.	0.707
C.	0.5
D.	indeterminate due to insufficient data
Answer» D. indeterminate due to insufficient data

Discussion

5684.	The time constant of the network shown in figure is, when switch is closed.
A.	2RC
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/136-897-2.png">
C.	RC/2
D.	none
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/136-897-2.png">

Discussion

5685.	For an ideal transformer
A.	only Y parameter exist
B.	only Z parameter
C.	Z, Y both exist
D.	neither Z parameter nor Y parameter exist
Answer» C. Z, Y both exist

Discussion

5686.	An ac network has two sources of the same frequency. The currents in one branch when the sources act independently are 10 30 A and 10 60 A. When both sources act, the current in the branch should be
A.	19.32 45
B.	15 45
C.	20 45
D.	zero
Answer» B. 15 45

Discussion

5687.	A network is said to be non-linear if it does not satisfy
A.	homogeneity condition
B.	superposition condition
C.	both (a) and (b)
D.	associative condition
Answer» D. associative condition

Discussion

5688.	Figure shows a parallel resonant circuit having resonance frequency of 15 MHZ. At this frequency
A.	its impedance is minimum
B.	its impedance is maximum
C.	its impedance is infinite
D.	its impedance is zero
Answer» C. its impedance is infinite

Discussion

5689.	An electrical network with 8 independent nodes will have __________ nodal equations.
A.	4
B.	6
C.	7
D.	8
Answer» D. 8

Discussion

5690.	In a circuit with capacitance connected to ac source, the rate of change of capacitor voltage is constant.
A.	True
B.	False
Answer» B. False

Discussion

5691.	The double energy transients occur in the
A.	pure inductive coil
B.	R-L circuit
C.	R-C circuit
D.	R-L-C circuit
Answer» E.

Discussion

5692.	Which one of the following is a passive device/Component?
A.	Transformer
B.	Oscillator
C.	Generator
D.	None
Answer» B. Oscillator

Discussion

5693.	Which one of the following theorem can be conveniently used to calculate the power consumed by the 10 &ohm; resistor in the network shown in the above figure?
A.	Thevenin's theorem
B.	Maximum power transfer theorem
C.	Millman's theorem
D.	Superposition theorem
Answer» E.

Discussion

5694.	A variable resistance R and capacitive reactance XC are connected in series. As R is varied, the locus of Z is
A.	a straight line parallel to Y axis in 4th quadrant
B.	a straight line parallel to X axis in 4th quadrant
C.	a straight line parallel to Y axis in second quadrant
D.	a straight line parallel to Y axis in first quadrant
Answer» D. a straight line parallel to Y axis in first quadrant

Discussion

5695.	The dual of a node is
A.	mesh
B.	principal node
C.	tree branch
D.	link
Answer» B. principal node

Discussion

5696.	In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will
A.	be reduced by half
B.	be doubled
C.	be four times as high
D.	be reduced to one fourth
Answer» B. be doubled

Discussion

5697.	At t = 0+, the current i1 is
A.	- V/2R
B.	- V/4R
C.	- V/R
D.	zero
Answer» D. zero

Discussion

5698.	Which one of the following is a cut set of the graph in the given figure?
A.	1, 2, 3, and 4
B.	2, 3, 4, and 6
C.	1, 4, 5, and 6
D.	1, 3, 4, and 5
Answer» E.

Discussion

5699.	Reciprocity theorem is applicable to
A.	circuits with one source
B.	circuits with only one independent source
C.	circuits with any number of sources
D.	circuits with any number of independent sources
Answer» C. circuits with any number of sources

Discussion

5700.	The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kind of elements, are a pole and a zero respectively. The above property will be satisfied by
A.	RL network only
B.	RC network only
C.	LC network only
D.	RC as well as RL network
Answer» C. LC network only

Discussion

Explore topic-wise MCQs in Engineering.

In figure, the current I

Consider the following statements Current through inductor cannot change abruptly.Voltage across capacitor cannot change abruptly.Initial value of f(t) is sF (s).Final value of f(t) is sF (s). Of the above statements

As B is increased from zero to about 2T, r, of a ferromagnetic material

Lead becomes a superconductor at

Mesh analysis is applicable __________ only.

In the circuit shown the voltage Vs has a phase angle of __________ with respect to VL.

The ideal voltmeter V of figure will read __________ volt.

The circuit of figure is generally employed as a

As x is increased from - to , the function

In figure, the short circuit current through terminal AB will be

In a varistor, as the voltage increases beyond a certain value, its resistance

Current through a charging capacitor exhibits

A battery charger can drive a current of 5A with 1&amp;ohm; resistance connected at its output. If it can charge 2 V battery at 7 A rate, its Thevenin's equivalent circuit will be

For the given circuit, the current I is

A two terminal black box contains one of the elements R, L, C. The black box is connected to 220 V as supply. The current is I, when a capacitance of 0.1 F is connected in series between the source and box, the current is 2I. The elements is

Which of the following graphs in figure correctly represents the variation of capacitive reactance with frequency?

If Z(s) is positive real, then where k has only positive real values is also positive real. This hypothesis was first given by

For a voltage transfer function H(s), realizable by RLC network, the following statements are made H(s) cannot have a pole at s = 0H(s) cannot have a pole at s = j4H(s) cannot have a pole at s = H(s) cannot have a pole at s = + 2 Of these statements

For a series resonant circuit at low frequency impedance is __________ and at high frequency circuit impedance is __________ .

Consider the following expression for the driving point impedance It represent on LC circuitIt represent on RLC circuitIt has poles lying on the j axisIt has a pole at infinite frequency and a zero at zero frequency. Which one fo the statement given above are correct?

If Y(s) = 1 + s, the network has

The response shown in figure is

Assertion (A): A graph is planar if it has a dual.Reason (R): The dual of a graph can be found by window dot method.

For 200V r.m.s. value triangular wave, the peak voltage will be

According to initial value theorem which one is correct

For any given two port network, any parameter set can be determined from measurements made at the two ports.

In carbon resistor colour code, the fourth band indicates tolerance.

For a full rectified sine wave, the form factor and peak factor respectively are

For an RC admittance function Y,

Power factor of the following circuit will be unity

The voltage of single phase supply to residential consumers in India is

When ac current is zero, no electrons are in motion.

In the transformer shown in figure, the inductance measured across terminal 1 and 2 was 4 H with terminals 3 and 4 open. It was 3H when terminals 3 and 4 are short circuited. The coefficient of coupling is

The time constant of the network shown in figure is, when switch is closed.

For an ideal transformer

An ac network has two sources of the same frequency. The currents in one branch when the sources act independently are 10 30 A and 10 60 A. When both sources act, the current in the branch should be

A network is said to be non-linear if it does not satisfy

Figure shows a parallel resonant circuit having resonance frequency of 15 MHZ. At this frequency

An electrical network with 8 independent nodes will have __________ nodal equations.

In a circuit with capacitance connected to ac source, the rate of change of capacitor voltage is constant.

The double energy transients occur in the

Which one of the following is a passive device/Component?

Which one of the following theorem can be conveniently used to calculate the power consumed by the 10 &amp;ohm; resistor in the network shown in the above figure?

A variable resistance R and capacitive reactance XC are connected in series. As R is varied, the locus of Z is

The dual of a node is

In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will

At t = 0+, the current i1 is

Which one of the following is a cut set of the graph in the given figure?

Reciprocity theorem is applicable to

The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kind of elements, are a pole and a zero respectively. The above property will be satisfied by

A battery charger can drive a current of 5A with 1&ohm; resistance connected at its output. If it can charge 2 V battery at 7 A rate, its Thevenin's equivalent circuit will be

For a series resonant circuit at low frequency impedance is and at high frequency circuit impedance is .

Which one of the following theorem can be conveniently used to calculate the power consumed by the 10 &ohm; resistor in the network shown in the above figure?