9294 + Mcqs in Electronics and Communication Engineering Page 89 McqOptions

4401.	In drawing phasor diagram
A.	rms values are used
B.	peak values are used
C.	either rms or peak values are used
D.	either rms or peak or averages values are used
Answer» B. peak values are used

Discussion

4402.	As the number SWG increases, area of cross-section decreases.
A.	True
B.	False
Answer» B. False

Discussion

4403.	In ZRC (s) has a pole at s = , the last element in first Foster realization is
A.	R
B.	C
C.	R and C in series
D.	R and C in parallel
Answer» B. C

Discussion

4404.	I = dq/dt.
A.	True
B.	False
Answer» B. False

Discussion

4405.	A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 &ohm;, the remaining circuit being the same, the current in this branch will be
A.	2.2 A
B.	less than 2.2 A
C.	2.2 A or less than 2.2 A
D.	2.2 A or less or more than 2.2 A
Answer» C. 2.2 A or less than 2.2 A

Discussion

4406.	For an RC impedance function Z
A.	Z( ) = Z(0)
B.	Z( ) < Z(0)
C.	Z( ) Z(0)
D.	Z( ) > Z(0)
Answer» D. Z( ) > Z(0)

Discussion

4407.	In figure, the effective capacitance between A and B is
A.	2 F
B.	4 F
C.	8 F
D.	10 F
Answer» C. 8 F

Discussion

4408.	Which one is correct option, if initial conditions is not zero, for inductor (L) and capacitor (c) is
A.	1, 3
B.	3, 2
C.	4, 1
D.	2, 4
Answer» E.

Discussion

4409.	In a minimum function
A.	the degree of numerator is higher than that of denominator
B.	the degree of numerator is lower than that of denominator
C.	the degree of numerator and denominator are equal
D.	the denominator is a constant
Answer» D. the denominator is a constant

Discussion

4410.	In a series circuit with fixed R and variable XL, the current locus lies in the fourth quadrant.
A.	True
B.	False
Answer» B. False

Discussion

4411.	A parallel connection of circuit is at below resonance circuit behave as
A.	RC circuit
B.	RL
C.	RLC
D.	resistive only
Answer» C. RLC

Discussion

4412.	Assertion (A): In figure the coefficients , n = 1, 2, ... and bn = 0Reason (R): The periodic function is symmetrical about t = T and t = T/2.
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

4413.	The resistance of human body is about
A.	5000 &ohm;
B.	2000 &ohm;
C.	1000 &ohm;
D.	200 &ohm;
Answer» D. 200 &ohm;

Discussion

4414.	In figure, V reads 45V. Then I =
A.	10.1 A
B.	13.3 A
C.	16.1 A
D.	19.4 A
Answer» B. 13.3 A

Discussion

4415.	A capacitor behave to d.c. as
A.	short-circuit
B.	an open-circuit
C.	it behaves to a.c.
D.	none of these.
Answer» C. it behaves to a.c.

Discussion

4416.	For the time domain response shown in figure the pole
A.	lies in left half plane
B.	lies in right half plane
C.	lies at origin
D.	may be complex or imaginary
Answer» D. may be complex or imaginary

Discussion

4417.	When three 100 K, 10% fixed resistors of 1/4 W Power rating are connected in parallel, the resulting 33 K resistor will have a tolerance specification and power rating of
A.	10% and 3/4 W respectively
B.	10% and 1/12 W respectively
C.	3.3.% and 3/4 W respectively
D.	30% and 3/4 W respectively
Answer» B. 10% and 1/12 W respectively

Discussion

4418.	For the circuit shown in the figure, the initial conditions are zero. Its transfer function is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-978-3.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-978-4.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-978-5.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-978-6.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-978-5.png">

Discussion

4419.	A capacitor with initial charge q0 at t = 0+ acts as
A.	current source
B.	voltage source
C.	short-circuit
D.	open-circuit
Answer» D. open-circuit

Discussion

4420.	Form factor for a sine wave is
A.	1.414
B.	0.707
C.	1.11
D.	0.637
Answer» D. 0.637

Discussion

4421.	The capacitance of a cylindrical capacitor is directly proportional to its length.
A.	True
B.	False
Answer» B. False

Discussion

4422.	In a passive band pass filter, the resonant frequencies of series and shunt arms are equal.
A.	True
B.	False
Answer» B. False

Discussion

4423.	Paley Wiener criterion states that a necessary and sufficient condition for an amplitude function \|H(j )\| to be causal is that
A.	True
B.	False
Answer» B. False

Discussion

4424.	Choose the correct option, where H(s) is transfer function, Z(s) is driving point impedance functions
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/138-939-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/138-939-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/139-939-3.png">
D.	all
Answer» E.

Discussion

4425.	In a series resonant circuit, the resonant frequency is
A.	geometric mean of half power frequencies
B.	arithmetic mean of half power frequencies
C.	difference of half power frequencies
D.	none of the above
Answer» B. arithmetic mean of half power frequencies

Discussion

4426.	If a function Z(s) has a pole at infinity, then
A.	the degrees of numerator and denominator are equal
B.	the degree of numerator is one higher than that of denominator
C.	the degree of denominator is one higher than that of numerator
D.	the difference between the degrees of numerator and denominator is 0 or 1
Answer» C. the degree of denominator is one higher than that of numerator

Discussion

4427.	A circuit said to be lumped when physical dimensions of all the component are __________ .
A.	greater compared with wavelength of electromagnetic signal
B.	small compared with wavelength electromagnetic signal
C.	negligible compared with wavelength of electromagnetic signal
D.	equal compared with wavelength of electromagnetic signal
Answer» D. equal compared with wavelength of electromagnetic signal

Discussion

4428.	Assertion (A): Q factor of a series resonant circuit is Reason (R): High Q means better selectivity.
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

4429.	A coil with large distributed capacitance has a
A.	high resonant frequency
B.	low resonant frequency
C.	low quality factor
D.	low resistance
Answer» B. low resonant frequency

Discussion

4430.	In figure the number of tree branches and links respectively are
A.	3 and 2
B.	1 and 3
C.	4 and 1
D.	1 and 4
Answer» B. 1 and 3

Discussion

4431.	For a transfer function the coefficients of the numerator and denominator polynomials in s must be real.
A.	True
B.	False
Answer» B. False

Discussion

4432.	Complex poles give rise to oscillatory terms in the response.
A.	True
B.	False
Answer» B. False

Discussion

4433.	While drawing vector diagram for a series circuit, the reference vector is
A.	voltage
B.	current
C.	power
D.	phase angle
Answer» C. power

Discussion

4434.	For a given line voltage, four heating coils will produce maximum heat when connected
A.	all in parallel
B.	all in series
C.	with two parallel pairs in series
D.	one pair in parallel with the other two in series
Answer» B. all in series

Discussion

4435.	Two network said to be dual to each other
A.	if mesh equation of one is same to other of node equation
B.	if mesh equation of both is same
C.	if node equation of both is same
D.	neither mesh equation nor node equation is same
Answer» B. if mesh equation of both is same

Discussion

4436.	As per Euler's identity ej t = cos t + j sin t
A.	True
B.	False
Answer» B. False

Discussion

4437.	The reading of the voltmeter V in figure should be __________ volt.
A.	60
B.	10
C.	66
D.	0
Answer» C. 66

Discussion

4438.	Consider the following statements Tellegen's theorem is applicable to any lumped network.Reciprocity theorem is applicable to linear bilateral network.Thevenin theorem is applicable to two terminal linear active network.Norton's theorem is applicable to linear active network. Which of the above statements are correct?
A.	1, 2 and 3
B.	1, 2, 3 and 4
C.	1, 2 and 4
D.	3 and 4
Answer» C. 1, 2 and 4

Discussion

4439.	A network is causal if impulse response is zero for t < 0.
A.	True
B.	False
Answer» B. False

Discussion

4440.	When an alternating current passes through an ohmic resistance the electrical power converted into heat is
A.	apparent power
B.	true power
C.	reactive power
D.	none of the above
Answer» C. reactive power

Discussion

4441.	Volume control found on the front panel of television receivers
A.	a ganged resistor
B.	a variable resistor of logarithmic type
C.	a variable resistor of linear type
D.	a trimmer potentiometer
Answer» C. a variable resistor of linear type

Discussion

4442.	The time constant of the circuit in figure is
A.	RC
B.	2 RC
C.	3 RC
D.	5 RC
Answer» C. 3 RC

Discussion

4443.	The circuit whose properties are same in either direction is known as
A.	unilateral circuit
B.	bilateral circuit
C.	irreversible circuit
D.	reversible circuit
Answer» C. irreversible circuit

Discussion

4444.	In a network containing resistances, reactances the root of the characteristic equation give for the circuit
A.	the forced response
B.	the total response
C.	the natural response
D.	the damped response
Answer» D. the damped response

Discussion

4445.	Assertion (A): Peak to peak value of a sinusoidal wave is 2.828 times the rms value.Reason (R): Peak factor of a sinusoidal wave is 1.414.
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

4446.	In the synthesis of RLC network
A.	the number of elements in Bott-Duffin synthesis and Brune's synthesis are always equal
B.	the number of elements in Bott-Duffin synthesis is more than that in Brune's synthesis
C.	the number of elements in Bott-Duffin synthesis is less than that in Brune's synthesis
D.	the number of elements in Bott-Duffin synthesis may be more or less than that in Brune's synthesis
Answer» C. the number of elements in Bott-Duffin synthesis is less than that in Brune's synthesis

Discussion

4447.	In all insulators the bonding is covalent.
A.	True
B.	False
Answer» C.

Discussion

4448.	In a purely resistive circuit the instantaneous power varies from zero to maximum twice in each cycle.
A.	True
B.	False
Answer» C.

Discussion

4449.	In terms of ABCD parameters, the image parameter Z11 is equal to
A.	<span class="root">AC/BD</span>
B.	<span class="root">BD/AC</span>
C.	<span class="root">AB/CD</span>
D.	<span class="root">AD/BC</span>
Answer» D. <span class="root">AD/BC</span>

Discussion

4450.	Drift velocity of electrons is generally less than 1 mm/s.
A.	True
B.	False
Answer» B. False

Discussion

Explore topic-wise MCQs in Engineering.

In drawing phasor diagram

As the number SWG increases, area of cross-section decreases.

In ZRC (s) has a pole at s = , the last element in first Foster realization is

I = dq/dt.

A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 &amp;ohm;, the remaining circuit being the same, the current in this branch will be

For an RC impedance function Z

In figure, the effective capacitance between A and B is

Which one is correct option, if initial conditions is not zero, for inductor (L) and capacitor (c) is

In a minimum function

In a series circuit with fixed R and variable XL, the current locus lies in the fourth quadrant.

A parallel connection of circuit is at below resonance circuit behave as

Assertion (A): In figure the coefficients , n = 1, 2, ... and bn = 0Reason (R): The periodic function is symmetrical about t = T and t = T/2.

The resistance of human body is about

In figure, V reads 45V. Then I =

A capacitor behave to d.c. as

For the time domain response shown in figure the pole

When three 100 K, 10% fixed resistors of 1/4 W Power rating are connected in parallel, the resulting 33 K resistor will have a tolerance specification and power rating of

For the circuit shown in the figure, the initial conditions are zero. Its transfer function is

A capacitor with initial charge q0 at t = 0+ acts as

Form factor for a sine wave is

The capacitance of a cylindrical capacitor is directly proportional to its length.

In a passive band pass filter, the resonant frequencies of series and shunt arms are equal.

Paley Wiener criterion states that a necessary and sufficient condition for an amplitude function |H(j )| to be causal is that

Choose the correct option, where H(s) is transfer function, Z(s) is driving point impedance functions

In a series resonant circuit, the resonant frequency is

If a function Z(s) has a pole at infinity, then

A circuit said to be lumped when physical dimensions of all the component are __________ .

Assertion (A): Q factor of a series resonant circuit is Reason (R): High Q means better selectivity.

A coil with large distributed capacitance has a

In figure the number of tree branches and links respectively are

For a transfer function the coefficients of the numerator and denominator polynomials in s must be real.

Complex poles give rise to oscillatory terms in the response.

While drawing vector diagram for a series circuit, the reference vector is

For a given line voltage, four heating coils will produce maximum heat when connected

Two network said to be dual to each other

As per Euler's identity ej t = cos t + j sin t

The reading of the voltmeter V in figure should be __________ volt.

A network is causal if impulse response is zero for t &lt; 0.

When an alternating current passes through an ohmic resistance the electrical power converted into heat is

Volume control found on the front panel of television receivers

The time constant of the circuit in figure is

The circuit whose properties are same in either direction is known as

In a network containing resistances, reactances the root of the characteristic equation give for the circuit

Assertion (A): Peak to peak value of a sinusoidal wave is 2.828 times the rms value.Reason (R): Peak factor of a sinusoidal wave is 1.414.

In the synthesis of RLC network

In all insulators the bonding is covalent.

In a purely resistive circuit the instantaneous power varies from zero to maximum twice in each cycle.

In terms of ABCD parameters, the image parameter Z11 is equal to

Drift velocity of electrons is generally less than 1 mm/s.

A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 &ohm;, the remaining circuit being the same, the current in this branch will be

A network is causal if impulse response is zero for t < 0.