9294 + Mcqs in Electronics and Communication Engineering Page 100 McqOptions

4951.	If
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-495-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-495-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-495-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-495-5.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-495-4.png">

Discussion

4952.	The pole zero diagram of an impedance Z has a pole at s = - 6 and zero at s = - 4 as shown in figure the constant multiplier k = 1. For a signal Is = cos 6t, the steady state voltage across Z is given in magnitude as under
A.	0.6
B.	0.84
C.	7.2
D.	none
Answer» C. 7.2

Discussion

4953.	A resistor R of 1 &ohm; and two inductor L1 and L2 of inductances 1 H and 2 H respectively, are connected in parallel. At some time, the current through L1 and L2 are 1 A and 2 A, respectively. The current through R at time t = will be
A.	zero
B.	1 A
C.	2 A
D.	3 A
Answer» B. 1 A

Discussion

4954.	In the circuit of figure the current through 5 &ohm; resistance at t = 0+ is
A.	0 A
B.	10 A
C.	6.67 A
D.	5.1 A
Answer» D. 5.1 A

Discussion

4955.	Stray capacitance is important at low frequencies.
A.	True
B.	False
Answer» C.

Discussion

4956.	A non-linear element has zero resistance.
A.	True
B.	False
Answer» C.

Discussion

4957.	For the two port of figure, z11 is
A.	26/7 &ohm;
B.	10/3 &ohm;
C.	6 &ohm;
D.	2 &ohm;
Answer» B. 10/3 &ohm;

Discussion

4958.	In a RL circuit, the angle, by which the current lags the voltage is
A.	0 > > - 90
B.	90
C.	0
D.	0 < < 90
Answer» E.

Discussion

4959.	Wave A starts its positive half cycle at t = 30 and wave B starts its positive half cycle at t = 75 then wave B is leading wave A by 45 .
A.	True
B.	False
Answer» C.

Discussion

4960.	A coil of resistance R and inductance L is connected in series with 5 F capacitor. The source frequency is equal to resonance frequency and circuit current is 0.5 A. Another 5 F capacitor is connected in parallel with the above capacitor. The circuit current will be
A.	0.5 A
B.	more than 0.5 A
C.	less than 0.5 A
D.	0.5 A or less
Answer» D. 0.5 A or less

Discussion

4961.	Assertion (A): For networks in figure (1) and (2) sum of products of branch voltages and branch currents at any time is zero.Reason (R): The networks in figure (1) and (2) are not the same structurally.
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

4962.	In the circuit of figure the switch is open for a long time, At t = 0 the switch is closed. At t = 0+ the current supplied by battery is
A.	6 A
B.	3 A
C.	3.6 A
D.	1.5 A
Answer» C. 3.6 A

Discussion

4963.	In the circuit, Vs = 10 cos t, power drawn by the 4&ohm; resistor is 8 watt. The power factor is
A.	1
B.	0.5
C.	0.85
D.	0
Answer» D. 0

Discussion

4964.	The electric energy required to raise the temperature of a given amount of water is 1000 kWh. If heat losses are 25%, the total heating energy required is __________ kWh.
A.	1500
B.	1250
C.	1333
D.	1000
Answer» C. 1333

Discussion

4965.	In figure, i(t) is a unit step current. The steady state value of v(t) is
A.	2 V
B.	3 V
C.	6 V
D.	9 V
Answer» B. 3 V

Discussion

4966.	Complex pole in z-plane is as shown below. This is the pole diagram for __________ .
A.	Decaying sinusoidal sequence
B.	Growing sinusoidal sequence
C.	Decaying non sinusoidal sequence
D.	Growing non sinusoidal sequence
Answer» B. Growing sinusoidal sequence

Discussion

4967.	Four messages band limited to W, W, 2W and 3W respectively are to be multiplex using Time Division Multiplexing (TDM). The minimum bandwidth required for transmission of this TDM signal is
A.	W
B.	3W
C.	6W
D.	7W
Answer» D. 7W

Discussion

4968.	Which of the following terms are equivalent? A B CA B &odot; C A &odot; B CA &odot; B &odot; C
A.	1 and 4; 2 and 3
B.	1 and 3
C.	2 and 3
D.	1, 2 and 4
Answer» B. 1 and 3

Discussion

4969.	Find I in 4 resistor.
A.	1 A
B.	0.5 A
C.	0.75 A
D.	0.95 A
Answer» D. 0.95 A

Discussion

4970.	A sequential multiplexer is connected as shown in figure. Each time the multiplexer receives the clock, it switches to the next channel from 6 to 1. If the input signals are :A = 10 cos 2p(4 x 103t)B = 15 cos 2p(5 x 103t)C = 20 cos 2p(6 x 103t)D = 10 cos 2p(10 x 103t)The minimum clock frequency should be __________ kHz.
A.	8 kHz
B.	50 kHz
C.	20 kHz
D.	10 kHz
Answer» D. 10 kHz

Discussion

4971.	A square in which each (i, j)th element of matrix is equal to the negative of the conjugate complex of (j, i)th element, is called
A.	Hermitian matrix
B.	Skew symmetric matrix
C.	Conjugate anti-symmetric matrix
D.	Skew-Hermitian matrix
Answer» E.

Discussion

4972.	Mid-band gain =
A.	100
B.	- 100
C.	50
D.	- 50
Answer» C. 50

Discussion

4973.	For the asymptotic Bode magnitude plot shown below, the system transfer function can be
A.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/7-03-19-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/7-03-19-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/7-03-19-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/7-03-19-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/7-03-19-2.png">

Discussion

4974.	2's complement representation of a 16 bit number (one sign bit and 15 magnitude bits) is FFFF. Its magnitude in decimal representation is
A.	0
B.	1
C.	32, 767
D.	65, 535
Answer» C. 32, 767

Discussion

4975.	The characteristic equation of a feedback control system is given by s3 + 5s2 + (K + 6)s + K = 0where K > 0 is a scalar variable parameter. In the root-loci diagram of the system the asymptotes of the root-locus for large values of K meet at a point in the s-plane, whose coordinates are :
A.	(- 3, 0)
B.	(- 2, 0)
C.	(- 1, 0)
D.	(2, 0)
Answer» D. (2, 0)

Discussion

4976.	The input 3-dB frequency is :
A.	100 Hz
B.	148 Hz
C.	100 kHz
D.	None
Answer» C. 100 kHz

Discussion

4977.	The circuit in figure, is to be scaled to an impedance level of 5k&ohm; and resonant frequency of 5 x 106 rad/sec. The possible combination of R, L, C is
A.	2.5&ohm;, 0.2 mH, 200 pF
B.	5 k&ohm;, 0.2 mH, 200 pF
C.	5 k&ohm;, 0.2 mH, 200 F
D.	5 k&ohm;, 0.1 mH, 0.4 F
Answer» C. 5 k&ohm;, 0.2 mH, 200 F

Discussion

4978.	In figure, the total power consumed is
A.	10 W
B.	12 W
C.	16 W
D.	20 W
Answer» B. 12 W

Discussion

4979.	A current wave is i = 100e-60t The initial and final values of current are
A.	100 and 50
B.	100 and 0
C.	0 and 100
D.	100 and 100
Answer» C. 0 and 100

Discussion

4980.	A ramp input applied to a unity feedback system results in 5% steady state error. The type number and zero frequency gain of the system are respectively.
A.	1 and 20
B.	0 and 20
C.	0 and 1/20
D.	1 and 1/20
Answer» B. 0 and 20

Discussion

4981.	A fair coil is tossed 10 times. What is the probability that ONLY the first two tosses will yield heads?
A.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-02-11-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-02-11-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-02-11-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-02-11-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-02-11-4.png">

Discussion

4982.	Given If , then the value of K is
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

4983.	Consider the Schmitt trigger circuit shown below. A triangular wave which goes from - 12 V to 12 V is applied to the inverting input of the op-amp. Assume that the output of the op-amp moves from +15 V to -15 V. The voltage at the non-inverting switches between
A.	-12 V and +12 V
B.	-7.5 V and +7.5 V
C.	-5 V and +5 V
D.	0 V and 5 V
Answer» C. -5 V and +5 V

Discussion

4984.	The circuit given below is:
A.	Band stop filter
B.	Band pass filter
C.	Oscillator circuit
D.	All pass filter
Answer» C. Oscillator circuit

Discussion

4985.	For dielectric to dielectric interface with surface charge density, which of the following statements are true? Dn2 - Dn1 = rsEt1 = Et2En1 = En2
A.	1, 2 and 3
B.	1, 2 and 4
C.	1, 2 only
D.	1, 4 only
Answer» C. 1, 2 only

Discussion

4986.	Step responses of a set of three second-order underdamped systems all have the same percentage overshoot. Which of the following diagrams represents the pole of the three systems?
A.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-02-12-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-02-12-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-02-12-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-02-12-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/5-02-12-4.png">

Discussion

4987.	FET oscillator circuit diagram is shown The frequency of oscillation is(M is mutual inductance between L1 and L2)
A.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-72-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-72-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-72-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-72-5.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-748-72-5.png">

Discussion

4988.	Consider the following: OscillatorEmitter followerCascaded amplifierPower amplifier Where of these use feedback amplifiers?
A.	1 and 2
B.	1 and 3
C.	2 and 4
D.	3 and 4
Answer» B. 1 and 3

Discussion

4989.	The OP-AMP circuit shown above represents a
A.	high pass filter
B.	low pass filter
C.	band pass filter
D.	band reject filter
Answer» C. band pass filter

Discussion

4990.	For a periodic signal with finite number of discontinuities in each period, at isolated points of discontinuity the series converges to __________ .
A.	difference value of signal on either side of discontinuity
B.	highest value of signal on either side of discontinuity
C.	average value of signal on either side of discontinuity
D.	sum of value of signal on either side of discontinuity
Answer» D. sum of value of signal on either side of discontinuity

Discussion

4991.	The function shown in figure, can represent a probability density function for A __________
A.	A = 1/4
B.	A = 1/6
C.	A = 1/9
D.	A = 1/2
Answer» D. A = 1/2

Discussion

4992.	If the transfer function of the following network is The value of the load resistance RL is
A.	R/4
B.	R/2
C.	R
D.	2R
Answer» D. 2R

Discussion

4993.	Find the value of ix if each resistance is of 3 and each battery is of 6 V.
A.	1.1428 V
B.	1.432 A
C.	0.2892 A
D.	O A
Answer» D. O A

Discussion

4994.	The common emitter model is shown below: The h-parameter of this model are:
A.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-745-32-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-745-32-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-745-32-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-745-32-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-745-32-3.png">

Discussion

4995.	In the following limiter circuit, an input voltage V1 = 10 sin 100pt applied. Assume that the diode drop is 0.7 V when it is forward biased. The zener breakdown voltage is 6.8 VThe maximum and minimum values of the output voltage respectively are
A.	6.1 V, -0.7 V
B.	0.7 V, -7.5 V
C.	7.5 V, -0.7 V
D.	7.5 V, -7.5 V
Answer» D. 7.5 V, -7.5 V

Discussion

4996.	Find RTH
A.	200
B.	0
C.	400
D.	None of these
Answer» D. None of these

Discussion

4997.	The feedback control system shown in figure is stable for what values of K and T?
A.	K < 0, T > - 1
B.	K > 0, T > 0
C.	K > 0, T > - 1
D.	K < 0, T > 0
Answer» D. K < 0, T > 0

Discussion

4998.	If the memory chip size is 256 x 1 bits, then the number of chips required to make up 1 kB (1024) bytes of memory is
A.	32
B.	24
C.	12
D.	8
Answer» B. 24

Discussion

4999.	Find z parameters for the following network
A.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/13-05-42-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/13-05-42-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/13-05-42-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/13-05-42-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/13-05-42-2.png">

Discussion

5000.	The number of open right half plane poles of is
A.	0
B.	1
C.	2
D.	3
Answer» D. 3

Discussion

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The pole zero diagram of an impedance Z has a pole at s = - 6 and zero at s = - 4 as shown in figure the constant multiplier k = 1. For a signal Is = cos 6t, the steady state voltage across Z is given in magnitude as under

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Given If , then the value of K is

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The circuit given below is:

For dielectric to dielectric interface with surface charge density, which of the following statements are true? Dn2 - Dn1 = rsEt1 = Et2En1 = En2

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