9294 + Mcqs in Electronics and Communication Engineering Page 115 McqOptions

5701.	Assertion (A): A band elimination filter attenuates signals whose frequencies lie between the cutoff frequencies.Reason (R): A band elimination circuit is very different from band pass circuit.
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» C. A is true but R is false

Discussion

5702.	Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is
A.	0.5
B.	0.25
C.	0.125
D.	<span class="root">0.5</span>
Answer» B. 0.25

Discussion

5703.	The unit of permeability is
A.	T
B.	Wb
C.	H/M
D.	H
Answer» D. H

Discussion

5704.	A sinusoidal current having peak value of 7.07 A is superimposed on dc of 5A. If a hot-wire ammeter is used to measure the combined current in the circuit, it will indicate __________ ampere.
A.	7.07
B.	10
C.	12.07
D.	2.07
Answer» B. 10

Discussion

5705.	An ideal current source has
A.	infinite source resistance
B.	zero source resistance
C.	large value of source resistance
D.	finite value of source resistance
Answer» B. zero source resistance

Discussion

5706.	The series element in band pass filter is
A.	capacitive
B.	inductive
C.	parallel combination of inductance and capacitance
D.	series combination of inductance and capacitance
Answer» E.

Discussion

5707.	The circuit shown in figure is a
A.	low pass filter
B.	high pass filter
C.	band pass filter
D.	band stop filter
Answer» B. high pass filter

Discussion

5708.	The polynomial P (s) = (s - 1) (s2 + 1) (s + 2) (s + 3) is
A.	Hurwitz but not strictly Hurwitz
B.	not Hurwitz
C.	strictly Hurwitz
D.	anti/Hurwitz
Answer» D. anti/Hurwitz

Discussion

5709.	If a resistance R of 1 &ohm; is connected between A and B in figure, current flowing through R is
A.	1 A
B.	0.5 A
C.	0.25 A
D.	0.125 A
Answer» D. 0.125 A

Discussion

5710.	Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is
A.	average of the time constants of individual coils
B.	sum of the time constants of the individual coils
C.	geometric mean of the time constants of individual coils
D.	product of the time constants of the individual coils
Answer» B. sum of the time constants of the individual coils

Discussion

5711.	A dielectric should have poor heat conductivity.
A.	True
B.	False
Answer» C.

Discussion

5712.	The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its
A.	sensitivity
B.	attenuation
C.	selectivity
D.	modulation
Answer» D. modulation

Discussion

5713.	Assertion (A): A graph can have many trees.Reason (R): The number of tree branches is equal to number of nodes.
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» E.

Discussion

5714.	Electric shock is
A.	always fatal
B.	never fatal
C.	sometimes fatal
D.	always disfiguring
Answer» D. always disfiguring

Discussion

5715.	The first critical frequency nearest the origin of the complex frequency plane for an RL driving point impedance will be
A.	a zero in left half plane
B.	a zero in right half plane
C.	a pole in left half plane
D.	a pole or zero in left half plane
Answer» B. a zero in right half plane

Discussion

5716.	Choose the correct option Transit period is the time between two steady stateTransient Response is the response due to internal energy stored in circuitTransit response is also called natural responseTransit response arises due to presence of C and L in the circuitTransit is due to R, L, C in the circuit
A.	4, 3, 2 , 1
B.	5, 4, 3, 2
C.	5, 4, 3, 1
D.	5, 1, 4
Answer» B. 5, 4, 3, 2

Discussion

5717.	If current is less than 20 mA and time of contact is very small, the effect of current on human body is likely to be temporary.
A.	True
B.	False
Answer» B. False

Discussion

5718.	For representing two sinusoidal voltages on a phasor diagram
A.	Both voltages must be of the same frequency
B.	Both voltages must be sinusoidal but may be of different frequencies
C.	One of the voltages must be of 50 Hz
D.	The frequency of one must be integral of that of other
Answer» B. Both voltages must be sinusoidal but may be of different frequencies

Discussion

5719.	The colour code of a carbon resistance is yellow-violet-orange silver. The value of resistance is
A.	57000 &ohm; 5%
B.	47000 &ohm; 10%
C.	47000 &ohm; 5%
D.	57000 &ohm; 5%
Answer» C. 47000 &ohm; 5%

Discussion

5720.	While using Maxwell bridge, the Q factor of a coil is obtained as
A.	1/ CR
B.	CR
C.	C/R
D.	R/ C
Answer» C. C/R

Discussion

5721.	Kirchoff's laws are applicable to
A.	steady state conditions only
B.	transient conditions only
C.	both steady state and transient condition
D.	both steady state and transient condition but with some constraints
Answer» D. both steady state and transient condition but with some constraints

Discussion

5722.	In solid dielectrics the rate of deterioration doubles for every 10-12 C rise in temperature.
A.	True
B.	False
Answer» B. False

Discussion

5723.	Two impedances are connected in series. Three voltmeters are connected, one across each impedance and one across combination. The readings of all the three are equal. The phase angle between voltages across the two impedances is
A.	30
B.	60
C.	90
D.	120
Answer» E.

Discussion

5724.	If R, L, C are in parallel, the currents through L and C are equal in magnitude at resonance.
A.	True
B.	False
Answer» B. False

Discussion

5725.	In all pure metals, temperature coefficient of resistance is positive.
A.	True
B.	False
Answer» B. False

Discussion

5726.	In a driving point function, the degrees of numerator and denominator polynomials in s may differ by either zero or one only.
A.	True
B.	False
Answer» B. False

Discussion

5727.	The sum of two sine waves of different frequencies is a sine wave.
A.	True
B.	False
Answer» C.

Discussion

5728.	When iron rod is magnetised by the flowing through its coil, the polarities of its different points will be
A.	Pole A is N-pole, B is S-pole and C is neutral
B.	A is N, B and C is S
C.	A is N, C is S
D.	A is S, C is neutral, B is N
Answer» B. A is N, B and C is S

Discussion

5729.	Steady state conditions are considered to be achieved in R-L circuits at the end of __________ time constant.
A.	one
B.	two
C.	four
D.	five
Answer» E.

Discussion

5730.	Paper capacitors are used in power supplies for filtering.
A.	True
B.	False
Answer» B. False

Discussion

5731.	In any two port network, input impedance is independent of load impedance.
A.	True
B.	False
Answer» C.

Discussion

5732.	Dielectric materials have high specific resistance.
A.	True
B.	False
Answer» B. False

Discussion

5733.	For ideal performance, a filter should be terminated in characteristic impedance.
A.	True
B.	False
Answer» B. False

Discussion

5734.	The function is an
A.	LC function
B.	RC function
C.	RL function
D.	LC or RC function
Answer» B. RC function

Discussion

5735.	In a loss-free R-L-C circuit the transient current is
A.	oscillating
B.	square wave
C.	sinusoidal
D.	non-oscillating
Answer» D. non-oscillating

Discussion

5736.	The magnitude response of a normalised Butterworth low pass filter is
A.	linear starting with value of unity at zero frequency and 0.707 at cut off frequency
B.	non linear all through but with values of unity at zero frequency and 0.707 at cut off frequency
C.	linear upto cut off frequency and nonlinear thereafter
D.	nonlinear upto cut off frequency and linear thereafter
Answer» B. non linear all through but with values of unity at zero frequency and 0.707 at cut off frequency

Discussion

5737.	In steady state condition inductor behave as
A.	open circuit
B.	short circuit
C.	current source
D.	voltage source
Answer» C. current source

Discussion

5738.	When a lead acid battery is fully charged the colours of its positive and negative plates are
A.	grey and dark brown
B.	dark grey and brown
C.	grey and brown
D.	dark brown and grey
Answer» E.

Discussion

5739.	Network transients are due to
A.	circuit resistance
B.	circuit voltage
C.	changes in energy stored in L and C
D.	circuit admittance
Answer» D. circuit admittance

Discussion

5740.	The Laplace transform of i(t) is given by As t the value of i(t), tends to
A.	0
B.	2
C.	1
D.
Answer» C. 1

Discussion

5741.	Assertion (A): In an R-L circuit having low resistance, current lags the voltage by nearly 90 .Reason (R): Power factor of a series RL circuit is R/Z.
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» B. Both A and R are true and R is not the correct explanation of A

Discussion

5742.	Two coils are so wound that 60% of the flux of one links the other. The coefficient of coupling is
A.	1.67
B.	0.6
C.	0.36
D.	0.216
Answer» C. 0.36

Discussion

5743.	In the graph of figure, the total number of trees is
A.	4
B.	5
C.	6
D.	8
Answer» E.

Discussion

5744.	In a sine wave, maximum rate of change of voltage occurs at
A.	ascent of the waveform
B.	+ ve maximum
C.	- ve maximum
D.	between maximum and minimum
Answer» E.

Discussion

5745.	An RLC series circuit is excited by a step voltage E. The circuit current at t = 0 is
A.	E/R
B.	E/
C.	<span class="root">LC</span>
D.	zero
E.	infinity
Answer» D. zero

Discussion

5746.	The Laplace transform of a function f(t) u(t) is __________ where f(t) is periodic with period T, and y(S) times the L.T. of f(t) for first period. Then
A.	<i>s</i>
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/130-812-1.png">
C.	<i>e</i>
D.	<sup>T<i>s</i></sup>
E.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/130-812-2.png">
Answer» E. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/130-812-2.png">

Discussion

5747.	What are the ABCD parameters of the single elements circuit given below?
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/147-1045-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/147-1045-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/147-1045-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/147-1045-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/147-1045-3.png">

Discussion

5748.	In a Hurwitz polynomial
A.	all coefficients are non-negative
B.	the coefficients may be positive or negative
C.	all coefficients are negative
D.	all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis
Answer» E.

Discussion

5749.	The following table gives some Laplace transforms and the functionsf(t) F(s)1. (t) s2. u(t) 1/s3. tu(t) 2/s24. t2u(t) 2s3Of these the correctly matched pairs are
A.	2 and 4
B.	1 and 4
C.	2 and 4
D.	1 and 2
Answer» B. 1 and 4

Discussion

5750.	In series as well as parallel resonant circuits, increasing the value of resistance would lead to
A.	decrease in bandwidth of both the circuits
B.	increase in bandwidth of both the circuits
C.	decrease in bandwidth in series circuit and increase in parallel circuit
D.	increase in bandwidth in series circuit and decrease in parallel circuit
Answer» D. increase in bandwidth in series circuit and decrease in parallel circuit

Discussion

Explore topic-wise MCQs in Engineering.

Assertion (A): A band elimination filter attenuates signals whose frequencies lie between the cutoff frequencies.Reason (R): A band elimination circuit is very different from band pass circuit.

Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is

The unit of permeability is

A sinusoidal current having peak value of 7.07 A is superimposed on dc of 5A. If a hot-wire ammeter is used to measure the combined current in the circuit, it will indicate __________ ampere.

An ideal current source has

The series element in band pass filter is

The circuit shown in figure is a

The polynomial P (s) = (s - 1) (s2 + 1) (s + 2) (s + 3) is

If a resistance R of 1 &amp;ohm; is connected between A and B in figure, current flowing through R is

Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is

A dielectric should have poor heat conductivity.

The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its

Assertion (A): A graph can have many trees.Reason (R): The number of tree branches is equal to number of nodes.

Electric shock is

The first critical frequency nearest the origin of the complex frequency plane for an RL driving point impedance will be

If current is less than 20 mA and time of contact is very small, the effect of current on human body is likely to be temporary.

For representing two sinusoidal voltages on a phasor diagram

The colour code of a carbon resistance is yellow-violet-orange silver. The value of resistance is

While using Maxwell bridge, the Q factor of a coil is obtained as

Kirchoff's laws are applicable to

In solid dielectrics the rate of deterioration doubles for every 10-12 C rise in temperature.

Two impedances are connected in series. Three voltmeters are connected, one across each impedance and one across combination. The readings of all the three are equal. The phase angle between voltages across the two impedances is

If R, L, C are in parallel, the currents through L and C are equal in magnitude at resonance.

In all pure metals, temperature coefficient of resistance is positive.

In a driving point function, the degrees of numerator and denominator polynomials in s may differ by either zero or one only.

The sum of two sine waves of different frequencies is a sine wave.

When iron rod is magnetised by the flowing through its coil, the polarities of its different points will be

Steady state conditions are considered to be achieved in R-L circuits at the end of __________ time constant.

Paper capacitors are used in power supplies for filtering.

In any two port network, input impedance is independent of load impedance.

Dielectric materials have high specific resistance.

For ideal performance, a filter should be terminated in characteristic impedance.

The function is an

In a loss-free R-L-C circuit the transient current is

The magnitude response of a normalised Butterworth low pass filter is

In steady state condition inductor behave as

When a lead acid battery is fully charged the colours of its positive and negative plates are

Network transients are due to

The Laplace transform of i(t) is given by As t the value of i(t), tends to

Assertion (A): In an R-L circuit having low resistance, current lags the voltage by nearly 90 .Reason (R): Power factor of a series RL circuit is R/Z.

Two coils are so wound that 60% of the flux of one links the other. The coefficient of coupling is

In the graph of figure, the total number of trees is

In a sine wave, maximum rate of change of voltage occurs at

An RLC series circuit is excited by a step voltage E. The circuit current at t = 0 is

The Laplace transform of a function f(t) u(t) is __________ where f(t) is periodic with period T, and y(S) times the L.T. of f(t) for first period. Then

What are the ABCD parameters of the single elements circuit given below?

In a Hurwitz polynomial

The following table gives some Laplace transforms and the functionsf(t) F(s)1. (t) s2. u(t) 1/s3. tu(t) 2/s24. t2u(t) 2s3Of these the correctly matched pairs are

In series as well as parallel resonant circuits, increasing the value of resistance would lead to

If a resistance R of 1 &ohm; is connected between A and B in figure, current flowing through R is