9294 + Mcqs in Electronics and Communication Engineering Page 91 McqOptions

4501.	In a composite filter terminating half sections are used for impedance matching.
A.	True
B.	False
Answer» B. False

Discussion

4502.	The bridge is balanced when the value of R is
A.	50 &ohm;
B.	100 &ohm;
C.	200 &ohm;
D.	250 &ohm;
Answer» D. 250 &ohm;

Discussion

4503.	In figure, the current through R is 1 A when VA = 0 and VB = 15V. If both VA and VB are increased by 15V each, current through R will be
A.	1 A
B.	0.5 A
C.	3 A
D.	0.33 A
Answer» D. 0.33 A

Discussion

4504.	When a series RL circuit having power factor angle 0 is switched on to an ac voltage Vm sin ( t + ), the transient term is zero if = 0.
A.	True
B.	False
Answer» B. False

Discussion

4505.	Laplace transform of tn is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/138-917-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/138-917-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/138-917-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/138-917-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/138-917-4.png">

Discussion

4506.	RMS value of a square wave is the same as peak value.
A.	True
B.	False
Answer» B. False

Discussion

4507.	Out of Metal-film type and Carbon-film type, the one with better tolerance specification is
A.	carbon-film
B.	metal-film type
C.	both have same tolerance
D.	none of these
Answer» C. both have same tolerance

Discussion

4508.	In a driving point function poles and zeros must be conjugate if complex or imaginary.
A.	True
B.	False
Answer» B. False

Discussion

4509.	Z-matrix for the network shown in the given figure is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1023-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1023-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1023-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1023-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1023-3.png">

Discussion

4510.	In a circuit containing a complex impedance, maximum power transfer takes place when load is
A.	pure resistance
B.	equal to the complex impedance
C.	conjugate complex of the circuit impedance
D.	none of the above
Answer» D. none of the above

Discussion

4511.	The resistance of a bulb at the time of full brightness is 1200 &ohm;. Then the resistance at room temperature is about
A.	1200 &ohm;
B.	120 &ohm;
C.	600 &ohm;
D.	10 &ohm;
Answer» C. 600 &ohm;

Discussion

4512.	For a delayed half wave rectified wave, the average and rms values are lower than those for half wave.
A.	True
B.	False
Answer» B. False

Discussion

4513.	The input resistance of the network in figure is
A.	1.5 R
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/92-132-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/92-132-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/92-132-4.png">
Answer» E.

Discussion

4514.	When a series RL circuit is switched on to a dc voltage, the rate of change of current is maximum at t = 0.
A.	True
B.	False
Answer» B. False

Discussion

4515.	In the set of equationx1 =
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/104-391-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/104-391-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/104-391-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/104-391-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/104-391-3.png">

Discussion

4516.	The current flowing through a pure capacitor is called displacement current.
A.	True
B.	False
Answer» B. False

Discussion

4517.	For figure, the incidence matrix A is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-648-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-648-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-648-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-648-5.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-648-5.png">

Discussion

4518.	An active network has
A.	an e.m.f source
B.	a current source
C.	neither of the above
D.	either (a) or (b)
Answer» E.

Discussion

4519.	Which of the following material has nearly zero temperature-coefficient of resistance?
A.	Carbon
B.	Porcelain
C.	Copper
D.	Manganin
Answer» E.

Discussion

4520.	The storage battery used in power stations and substations is generally
A.	nickel cadmium battery
B.	lead acid battery
C.	zinc carbon battery
D.	zinc carbon or lead acid battery
Answer» C. zinc carbon battery

Discussion

4521.	If s is an element of area and I is the current through this element, current density J is defined as
A.	J = I/
B.	<i>s</i>
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/87-10-1.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/87-10-2.png">
E.	none of the above
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/87-10-1.png">

Discussion

4522.	For an m-derived filter, attenuation is infinite when f = f .
A.	True
B.	False
Answer» B. False

Discussion

4523.	The RLC circuit for driving point admittance function is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/116-606-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/116-606-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/116-606-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/116-606-5.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/116-606-5.png">

Discussion

4524.	Assertion (A): A branch with no current through it can be replaced by an open circuit or short circuit.Reason (R): Reciprocity theorem is applicable only if the circuit has one source.
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

4525.	Three capacitors each 9 F are connected in delta. The value of each capacitor in equivalent star connection is
A.	3 F
B.	6 F
C.	27 F
D.	81 F
Answer» D. 81 F

Discussion

4526.	The function is
A.	RC function
B.	LC function
C.	RL function
D.	RC or RL function
Answer» C. RL function

Discussion

4527.	The electrolyte in nickel cadmium cell is dilute potassium hydroxide.
A.	True
B.	False
Answer» B. False

Discussion

4528.	A series LCR circuit consisting of R = 20 &ohm;, \| XL \| = 20 &ohm; and \| XC \| = 20 &ohm;, connected across an A.C. supply of 200 V rms. The rms voltage across the capacitor is
A.	100 45
B.	400 -90
C.	400 +90
D.	100 -45
Answer» C. 400 +90

Discussion

4529.	In an ac network, Thevenin's impedance and Norton's impedance are
A.	always the same
B.	generally the same
C.	sometimes the same
D.	always different
Answer» B. generally the same

Discussion

4530.	Assertion (A): In KVL equations involving mutually coupled circuits the sign of M terms can be positive or negative.Reason (R): Dot convention helps in determining sign of M terms in KVL equations.
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

4531.	Peak to peak value of a sine wave is equal to twice the peak value
A.	True
B.	False
Answer» C.

Discussion

4532.	Kirchoff's voltage law is not valid for a non-linear network
A.	the statement is true
B.	the statement is false
C.	can't say
D.	none of the above
Answer» C. can't say

Discussion

4533.	Two coupled coils A and B are connected in series. The total inductances in series aiding and series opposing connections are LA and LB. The mutual inductance M is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-404-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-404-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-404-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-404-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-404-3.png">

Discussion

4534.	The units for electrochemical equivalent are
A.	grams
B.	grams per coulomb
C.	gram-coulomb
D.	grams per ampere
Answer» E.

Discussion

4535.	The impedance 3.2 - j 12 in polar form is given as
A.	6.4 - 75
B.	8.4 - 75
C.	10.4 - 75
D.	12.4 - 75
Answer» E.

Discussion

4536.	Tesla is unit of
A.
B.	B
C.	H
D.	MMF
Answer» C. H

Discussion

4537.	In the given circuit, V1 = 40 V when R is 10 &ohm;. When R is zero, the value of V2 will be
A.	40 V
B.	30 V
C.	20 V
D.	10 V
Answer» B. 30 V

Discussion

4538.	Choose the correct option Mesh is the smallest loop of circuitLoop is smallest path of circuitLoop does not contain any meshLoop may have one or more than one mesh
A.	1, 2, 3, 4
B.	3, 4, 2
C.	1, 4
D.	3, 2
Answer» D. 3, 2

Discussion

4539.	An input circuit has both direct and alternating current flowing through it. It is desired to transfer alternating current only by using one of the coupling units shown in figure. The coupling circuit which will do this job most effectively is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/148-1053-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/148-1053-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/148-1053-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/148-1053-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/148-1053-4.png">

Discussion

4540.	In one time constant, the current in a circuit reaches __________ percent of its final value.
A.	10
B.	37
C.	63
D.	85
Answer» D. 85

Discussion

4541.	When an ac circuit has sources of different frequencies, the only method of analysis is superposition theorem.
A.	True
B.	False
Answer» B. False

Discussion

4542.	In a Parallel connection of circuit the bandwidth in terms of R, L, C is
A.	B = 1/RC
B.	B = 1/RL
C.	B = 1/RLC
D.	B = RLC
Answer» B. B = 1/RL

Discussion

4543.	In a purely inductive ac circuit the power curve is a sinusoid of the same frequency as the voltage.
A.	True
B.	False
Answer» C.

Discussion

4544.	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
Answer» D. none of the above

Discussion

4545.	Which one is correct statement? Circuit is always openNetwork is always openCircuit is always closedNetwork is always closed
A.	1, 2
B.	2, 3
C.	3, 4
D.	1, 4
Answer» C. 3, 4

Discussion

4546.	The Q factor of a series RLC circuit is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/96-223-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/96-223-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/96-223-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/96-223-4.png">
Answer» E.

Discussion

4547.	If the network in figure (1), (2) are equivalent at terminals A - B, then voltage V and resistance R are
A.	100V and 12 &ohm;
B.	60V and 12 &ohm;
C.	100V and 30 &ohm;
D.	60V and 30 &ohm;
Answer» D. 60V and 30 &ohm;

Discussion

4548.	The function
A.	is a reactance function
B.	is an RC function
C.	is an RL function
D.	may be reactance function or RC function
Answer» B. is an RC function

Discussion

4549.	A source is delivering maximum power to a resistance through a network. The ratio of power delivered to the source power,
A.	is always 0.5
B.	may be 0.54 or less
C.	may be 0.5 or less
D.	may be 0.5 or more
Answer» C. may be 0.5 or less

Discussion

4550.	Which of the following memory is preferred in case of calculators?
A.	Dynamic RAM
B.	Dynamic ROM
C.	Static ROM
D.	Static RAM
Answer» B. Dynamic ROM

Discussion

Explore topic-wise MCQs in Engineering.

In a composite filter terminating half sections are used for impedance matching.

The bridge is balanced when the value of R is

In figure, the current through R is 1 A when VA = 0 and VB = 15V. If both VA and VB are increased by 15V each, current through R will be

When a series RL circuit having power factor angle 0 is switched on to an ac voltage Vm sin ( t + ), the transient term is zero if = 0.

Laplace transform of tn is

RMS value of a square wave is the same as peak value.

Out of Metal-film type and Carbon-film type, the one with better tolerance specification is

In a driving point function poles and zeros must be conjugate if complex or imaginary.

Z-matrix for the network shown in the given figure is

In a circuit containing a complex impedance, maximum power transfer takes place when load is

The resistance of a bulb at the time of full brightness is 1200 &amp;ohm;. Then the resistance at room temperature is about

For a delayed half wave rectified wave, the average and rms values are lower than those for half wave.

The input resistance of the network in figure is

When a series RL circuit is switched on to a dc voltage, the rate of change of current is maximum at t = 0.

In the set of equationx1 =

The current flowing through a pure capacitor is called displacement current.

For figure, the incidence matrix A is

An active network has

Which of the following material has nearly zero temperature-coefficient of resistance?

The storage battery used in power stations and substations is generally

If s is an element of area and I is the current through this element, current density J is defined as

For an m-derived filter, attenuation is infinite when f = f .

The RLC circuit for driving point admittance function is

Assertion (A): A branch with no current through it can be replaced by an open circuit or short circuit.Reason (R): Reciprocity theorem is applicable only if the circuit has one source.

Three capacitors each 9 F are connected in delta. The value of each capacitor in equivalent star connection is

The function is

The electrolyte in nickel cadmium cell is dilute potassium hydroxide.

A series LCR circuit consisting of R = 20 &amp;ohm;, | XL | = 20 &amp;ohm; and | XC | = 20 &amp;ohm;, connected across an A.C. supply of 200 V rms. The rms voltage across the capacitor is

In an ac network, Thevenin's impedance and Norton's impedance are

Assertion (A): In KVL equations involving mutually coupled circuits the sign of M terms can be positive or negative.Reason (R): Dot convention helps in determining sign of M terms in KVL equations.

Peak to peak value of a sine wave is equal to twice the peak value

Kirchoff's voltage law is not valid for a non-linear network

Two coupled coils A and B are connected in series. The total inductances in series aiding and series opposing connections are LA and LB. The mutual inductance M is

The units for electrochemical equivalent are

The impedance 3.2 - j 12 in polar form is given as

Tesla is unit of

In the given circuit, V1 = 40 V when R is 10 &amp;ohm;. When R is zero, the value of V2 will be

Choose the correct option Mesh is the smallest loop of circuitLoop is smallest path of circuitLoop does not contain any meshLoop may have one or more than one mesh

An input circuit has both direct and alternating current flowing through it. It is desired to transfer alternating current only by using one of the coupling units shown in figure. The coupling circuit which will do this job most effectively is

In one time constant, the current in a circuit reaches __________ percent of its final value.

When an ac circuit has sources of different frequencies, the only method of analysis is superposition theorem.

In a Parallel connection of circuit the bandwidth in terms of R, L, C is

In a purely inductive ac circuit the power curve is a sinusoid of the same frequency as the voltage.

The superposition theorem is applicable to

Which one is correct statement? Circuit is always openNetwork is always openCircuit is always closedNetwork is always closed

The Q factor of a series RLC circuit is

If the network in figure (1), (2) are equivalent at terminals A - B, then voltage V and resistance R are

The function

A source is delivering maximum power to a resistance through a network. The ratio of power delivered to the source power,

Which of the following memory is preferred in case of calculators?

The resistance of a bulb at the time of full brightness is 1200 &ohm;. Then the resistance at room temperature is about

A series LCR circuit consisting of R = 20 &ohm;, | XL | = 20 &ohm; and | XC | = 20 &ohm;, connected across an A.C. supply of 200 V rms. The rms voltage across the capacitor is

In the given circuit, V1 = 40 V when R is 10 &ohm;. When R is zero, the value of V2 will be