9294 + Mcqs in Electronics and Communication Engineering Page 87 McqOptions

4301.	Assertion (A): In high Q circuits poles of Y(s) lie close to axis in complex frequency plane.Reason (R): Q is inversely proportional to damping factor.
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

4302.	A 6 bit DAC uses binary weighted resistors. If MSB resistor is 20 k ohm, the value of LSB resistor is
A.	20 k ohm
B.	80 k ohm
C.	320 k ohm
D.	640 k ohm
Answer» E.

Discussion

4303.	A 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000). Then, what will be input, if the output register shows 100111 at the end of conversion.
A.	5.85 V
B.	6 V
C.	5 V
D.	10 V
Answer» B. 6 V

Discussion

4304.	The number of accumulators in 6800 are
A.	2
B.	3
C.	1
D.	4
Answer» B. 3

Discussion

4305.	The number of flip-flops required to build a mod-19 counter is
A.	4
B.	5
C.	6
D.	7
Answer» D. 7

Discussion

4306.	The number of flip-flops needed to divide the input frequency by 32 is
A.	2
B.	4
C.	5
D.	16
Answer» D. 16

Discussion

4307.	Given two numbers A and B in sign magnitude representation in an eight bit format A = 00011110 and B = 10011100 then A B gives
A.	10000010
B.	00011111
C.	10011101
D.	11100001
Answer» B. 00011111

Discussion

4308.	The 8085 microprocessor is interrupted while executing MOV instruction at location 0210 H. What is the location at which contents of register E are stored.
A.	054 CH
B.	054 DH
C.	054 EH
D.	054 FH
Answer» D. 054 FH

Discussion

4309.	The amplifier used in bootstrap voltage sweep should have a gain of
A.	+1
B.	+
C.	-1
D.	-
Answer» D. -

Discussion

4310.	+12 V supply is given to plates a, d, g, and 0 V to other plates and grid of a VF display. The plates which will glow are
A.	<i>a, d, g</i>
B.	<i>b, c, e, f</i>
C.	all
D.	none
Answer» D. none

Discussion

4311.	When cells are connected in series, emfs of all cells must be equal.
A.	True
B.	False
Answer» C.

Discussion

4312.	Which of the following is not a non-linear element?
A.	Transistor
B.	Heater coil
C.	Diode
D.	Electric arc with unlike electrodes
Answer» C. Diode

Discussion

4313.	Nodal analysis is applicable to __________ .
A.	planar network
B.	planar and Non-planar both
C.	circuit containing only voltage source
D.	non planer
Answer» C. circuit containing only voltage source

Discussion

4314.	The transfer function represents
A.	a high pass filter
B.	band elimination filter
C.	a resonator
D.	an all pass filter
Answer» B. band elimination filter

Discussion

4315.	For a series circuit of variable R and XL, the impedance locus is
A.	a straight line parallel to X axis in first quadrant
B.	a straight line parallel to X axis in fourth quadrant
C.	a straight line parallel to Y axis in second quadrant
D.	a straight line parallel to Y axis in first quadrant
Answer» B. a straight line parallel to X axis in fourth quadrant

Discussion

4316.	In a purely inductive ac circuit, the supply voltage and voltage induced across inductance are equal and opposite at all instants.
A.	True
B.	False
Answer» B. False

Discussion

4317.	For the star network of figure, the equivalent delta network is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-706-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-706-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-706-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-706-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-706-3.png">

Discussion

4318.	A zinc carbon cell is a primary cell.
A.	True
B.	False
Answer» C.

Discussion

4319.	In f(t) = (t - T), F(s) =
A.	1
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/109-493-1.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/109-493-2.png">
Answer» D. <sup>-T<i>s</i></sup>

Discussion

4320.	A tie set schedule shows
A.	incidence of branches to nodes
B.	incidence of branches to loops
C.	incidence of nodes to loops
D.	none of the above
Answer» C. incidence of nodes to loops

Discussion

4321.	When determining Thevenin's resistance of a circuit
A.	all sources must be open circuited
B.	all sources must be short circuited
C.	all voltages sources must be open circuited and all current sources must be short circuited
D.	all sources must be replaced by their internal resistances
Answer» C. all voltages sources must be open circuited and all current sources must be short circuited

Discussion

4322.	A series RL circuit is switched on to an exponential source Ve-at at t = 0. The current
A.	True
B.	False
Answer» C.

Discussion

4323.	A constant k band stop filter has cutoff frequencies of 1000 and 4000 Hz. The attenuation will be maximum when frequency is
A.	4000 Hz
B.	3000 Hz
C.	2000 Hz
D.	1000 Hz
Answer» D. 1000 Hz

Discussion

4324.	The equation where v1, v2 ... vb are the instantaneous branch voltages and i1, i2 ... ib are the instantaneous branch currents pertains to
A.	Compensation theorem
B.	Bisectional theorem
C.	Tellegen's theorem
D.	Reciprocity theorem
Answer» D. Reciprocity theorem

Discussion

4325.	A cut set schedule shows
A.	incidence of branches to loops
B.	incidence of branches to nodes
C.	incidence of nodes to loops
D.	none of the above
Answer» C. incidence of nodes to loops

Discussion

4326.	Transient current in an RLC circuit is oscillatory when
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/132-839-1.png">
B.	R = 0
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/132-839-2.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/132-839-3.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/132-839-3.png">

Discussion

4327.	The value of current at resonance in series R-L-C circuit is affected by the value of
A.	C
B.	L
C.	R
D.	all of the above
Answer» D. all of the above

Discussion

4328.	A dependent source
A.	may be a current source or voltage source
B.	is neither a current source nor a voltage source
C.	is always a voltage source
D.	is always a current source
Answer» E.

Discussion

4329.	Sometimes the rotating devices in a room having fluorescent lamps appear to be any station. This is due to
A.	defect in the lamp
B.	low voltage
C.	high voltage
D.	stroboscopic effect
Answer» B. low voltage

Discussion

4330.	Millman's theorem is the best to find
A.	equivalent voltage or current source
B.	equivalent voltage source
C.	equivalent voltage and resistance of a circuit
D.	none of the above
Answer» B. equivalent voltage source

Discussion

4331.	The dual of a loop is
A.	twig
B.	node pan
C.	mesh
D.	tree
Answer» E.

Discussion

4332.	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 the above
D.	none of the above
Answer» B. a current source

Discussion

4333.	Consider the following statements : Tellegen's theorem is applicable to any lumped networks.The reciprocity theorem is applicable to linear bilateral networks.Thevenin's theorem is applicable to two- terminal linear active networks.Norton's theorem is applicable to two-terminal linear active networks. Which of these statement are correct?
A.	1, 2, and 3
B.	1, 2 and 4
C.	1, 2, 3 and 4
D.	3 and 4
Answer» D. 3 and 4

Discussion

4334.	An RLC series circuit is excited by a step voltage E. The units of roots of characteristic equation are
A.	seconds
B.	1/seconds
C.	tesla
D.	henry
Answer» C. tesla

Discussion

4335.	An excitation is applied to a system at t = T, and its response is zero for - < t < T, such a system is
A.	non-causal system
B.	Stable system
C.	causal system
D.	unstable system
Answer» D. unstable system

Discussion

4336.	In ionic bonding, the valence electron is donated by one atom and accepted by the other atom.
A.	True
B.	False
Answer» B. False

Discussion

4337.	For stable network, the real part of poles and zeros of driving point function must be
A.	negative
B.	negative or zero
C.	zero
D.	positive
Answer» C. zero

Discussion

4338.	A capacitor does not allow sudden changes
A.	in currents
B.	in voltage
C.	in both current and voltage
D.	neither of two
Answer» C. in both current and voltage

Discussion

4339.	Assertion (A): Thevenin's theorem helps us to find current in a branch of a network for different values of impedances of that branch.Reason (R): Thevenin's equivalent circuit replaces a network by a voltage source in series with impedance.
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

4340.	The material used for fuse must have
A.	low melting point and low specific resistance
B.	low melting point and high specific resistance
C.	high melting point and low specific resistance
D.	none
Answer» C. high melting point and low specific resistance

Discussion

4341.	Assertion (A): When capacitor is fed by a dc voltage given a capacitor behaves as short circuit at t = 0 and open circuit at f = .Reason (R): The impedance of a capacitor is
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

4342.	The function (t - b) is a
A.	unit impulse
B.	unit step
C.	unit doublet
D.	none of the above
Answer» D. none of the above

Discussion

4343.	The circuit in figure is
A.	Cauer I form
B.	Foster I form
C.	Cauer II form
D.	Foster II form
Answer» C. Cauer II form

Discussion

4344.	Wire-wound resistors are unsuitable for use at high frequencies because they
A.	are likely to melt under excessive eddy current heat
B.	exhibit unwanted inductive and capacitive effects
C.	create more electrical noise
D.	consume more power
Answer» C. create more electrical noise

Discussion

4345.	The impedance of a coil above self-resonant frequency is
A.	inductive
B.	capacitive
C.	resistive
D.	none
Answer» E.

Discussion

4346.	The opposition of an inductor to current flow
A.	depends only on the resistance of the coil
B.	depends on the magnitude of the applied voltage
C.	varies directly with frequency
D.	varies inversely with frequency
Answer» D. varies inversely with frequency

Discussion

4347.	In a highly capacitive circuit the
A.	apparent power is equal to the actual power
B.	reactive power is more than the apparent power
C.	reactive power is more than the actual power
D.	actual power is more than its reactive power
Answer» D. actual power is more than its reactive power

Discussion

4348.	In ac circuits maximum power is delivered to a load if load impedance is conjugate of source impedance.
A.	True
B.	False
Answer» B. False

Discussion

4349.	The transfer function H(s) of a system is given by Given that understeady state conditions, the sinusoidal I/P and 0/P are respectively x(t) = cos 2t and y(t) = cos (2t + ), then the angle will be
A.	45
B.	0
C.	-45
D.	-90
Answer» D. -90

Discussion

4350.	In a series R-L-C circuit at the resonant frequency the
A.	current is maximum
B.	current is minimum
C.	impedance is maximum
D.	voltage is maximum
Answer» B. current is minimum

Discussion

Explore topic-wise MCQs in Engineering.

Assertion (A): In high Q circuits poles of Y(s) lie close to axis in complex frequency plane.Reason (R): Q is inversely proportional to damping factor.

A 6 bit DAC uses binary weighted resistors. If MSB resistor is 20 k ohm, the value of LSB resistor is

A 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000). Then, what will be input, if the output register shows 100111 at the end of conversion.

The number of accumulators in 6800 are

The number of flip-flops required to build a mod-19 counter is

The number of flip-flops needed to divide the input frequency by 32 is

Given two numbers A and B in sign magnitude representation in an eight bit format A = 00011110 and B = 10011100 then A B gives

The 8085 microprocessor is interrupted while executing MOV instruction at location 0210 H. What is the location at which contents of register E are stored.

The amplifier used in bootstrap voltage sweep should have a gain of

+12 V supply is given to plates a, d, g, and 0 V to other plates and grid of a VF display. The plates which will glow are

When cells are connected in series, emfs of all cells must be equal.

Which of the following is not a non-linear element?

Nodal analysis is applicable to __________ .

The transfer function represents

For a series circuit of variable R and XL, the impedance locus is

In a purely inductive ac circuit, the supply voltage and voltage induced across inductance are equal and opposite at all instants.

For the star network of figure, the equivalent delta network is

A zinc carbon cell is a primary cell.

In f(t) = (t - T), F(s) =

A tie set schedule shows

When determining Thevenin's resistance of a circuit

A series RL circuit is switched on to an exponential source Ve-at at t = 0. The current

A constant k band stop filter has cutoff frequencies of 1000 and 4000 Hz. The attenuation will be maximum when frequency is

The equation where v1, v2 ... vb are the instantaneous branch voltages and i1, i2 ... ib are the instantaneous branch currents pertains to

A cut set schedule shows

Transient current in an RLC circuit is oscillatory when

The value of current at resonance in series R-L-C circuit is affected by the value of

A dependent source

Sometimes the rotating devices in a room having fluorescent lamps appear to be any station. This is due to

Millman's theorem is the best to find

The dual of a loop is

If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be

An RLC series circuit is excited by a step voltage E. The units of roots of characteristic equation are

An excitation is applied to a system at t = T, and its response is zero for - &lt; t &lt; T, such a system is

In ionic bonding, the valence electron is donated by one atom and accepted by the other atom.

For stable network, the real part of poles and zeros of driving point function must be

A capacitor does not allow sudden changes

Assertion (A): Thevenin's theorem helps us to find current in a branch of a network for different values of impedances of that branch.Reason (R): Thevenin's equivalent circuit replaces a network by a voltage source in series with impedance.

The material used for fuse must have

Assertion (A): When capacitor is fed by a dc voltage given a capacitor behaves as short circuit at t = 0 and open circuit at f = .Reason (R): The impedance of a capacitor is

The function (t - b) is a

The circuit in figure is

Wire-wound resistors are unsuitable for use at high frequencies because they

The impedance of a coil above self-resonant frequency is

The opposition of an inductor to current flow

In a highly capacitive circuit the

In ac circuits maximum power is delivered to a load if load impedance is conjugate of source impedance.

The transfer function H(s) of a system is given by Given that understeady state conditions, the sinusoidal I/P and 0/P are respectively x(t) = cos 2t and y(t) = cos (2t + ), then the angle will be

In a series R-L-C circuit at the resonant frequency the

An excitation is applied to a system at t = T, and its response is zero for - < t < T, such a system is