9294 + Mcqs in Electronics and Communication Engineering Page 63 McqOptions

3101.	In the circuit of figure, the current through battery E2 is
A.	1 A discharging
B.	1 A charging
C.	9 A discharging
D.	9 A charging
Answer» C. 9 A discharging

Discussion

3102.	Assertion (A): Tie set schedule is used in nodal analysis.Reason (R): Loop currents are fictitious quantities.
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

3103.	If VA = - 10 V and VB = - 15 V, VAB = 5 V.
A.	True
B.	False
Answer» B. False

Discussion

3104.	In figure, the current supplied by battery at t = 0.5s is
A.	1.1 A
B.	1.9 A
C.	0
D.	1.632 A
Answer» E.

Discussion

3105.	When a lead acid cell discharges, the specific gravity of electrolyte increases.
A.	True
B.	False
Answer» C.

Discussion

3106.	A two branch parallel tuned circuit has a coil of resistance 100 &ohm; and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency, the dynamic resistance is
A.	1 &ohm;
B.	10 &ohm;
C.	100 &ohm;
D.	more than 100 &ohm;
Answer» E.

Discussion

3107.	An RLC series circuit has R = 1 &ohm;, L = 1 H, C = 1 F. The damping ratio is
A.	More than 1
B.	1
C.	0.5
D.	Zero
Answer» D. Zero

Discussion

3108.	In the circuit of figure, Thevenin's resistance is 10 &ohm;
A.	25 &ohm;
B.	10 &ohm;
C.	13.33 &ohm;
D.	6 &ohm;
Answer» C. 13.33 &ohm;

Discussion

3109.	Two 2 port circuits are connected cascaded. To determine the response, it is more convenient to use
A.	O.C. impedance parameters
B.	S.C. admittance parameters
C.	ABCD parameters
D.	<i>h</i>
E.	parameters
Answer» D. <i>h</i>

Discussion

3110.	In the circuit of figure. The current supplied by battery at t = is
A.	0 A
B.	5 A
C.	less than 5 A
D.	very large
Answer» C. less than 5 A

Discussion

3111.	In a purely capacitive circuit, the current __________ the voltage by __________ .
A.	lags, 0
B.	leads, 90
C.	lags, 90
D.	lags, 45
Answer» C. lags, 90

Discussion

3112.	A circuit has two branches in parallel and each branch has only one element. The applied voltage and source current are v = 200 sin (200t + 30 ) and i = 50 sin (200t + 50 ). If one branch has capacitor, the other branch contains
A.	resistance
B.	inductance
C.	capacitance
D.	resistance or capacitance
Answer» B. inductance

Discussion

3113.	The average value of wave in figure is
A.	90 V
B.	75 V
C.	60 V
D.	50 V
Answer» C. 60 V

Discussion

3114.	In the circuit shown in figure, Is = 4A, Vs = 4, the voltage V is given by
A.	6 V
B.	8 V
C.	4 V
D.	2 V
Answer» B. 8 V

Discussion

3115.	If B = 4 + j3, (B)1/3 =
A.	2 30
B.	2 36.87
C.	1.71 12.3
D.	1.71 30
Answer» C. 1.71 12.3

Discussion

3116.	For the two port network of figure, the voltage transfer ratio in s domain is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-283-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-283-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-283-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-283-5.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-283-4.png">

Discussion

3117.	The electrolyte in a dry cell is completely dry.
A.	True
B.	False
Answer» C.

Discussion

3118.	A series RLC circuit has a resonant frequency of 2000 Hz. The maximum voltage across C is likely to occur at a frequency of about
A.	1000 Hz
B.	4000 Hz
C.	2025 Hz
D.	1975 Hz
Answer» D. 1975 Hz

Discussion

3119.	Assertion (A): Thevenin's theorem and Norton's theorem are dual of each other.Reason (R): Voltage source can be converted into current source and vice versa.
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

3120.	In the network shown in figure, the voltage drops across R2 and R3 are 10 V and 16 V with polarities as shown. The current in R1
A.	is 9 A and directed towards node 0
B.	is 9 A and directed away from node 0
C.	is 9 A but directed of current cannot be found
D.	is impossible to be found
Answer» C. is 9 A but directed of current cannot be found

Discussion

3121.	A coil has a resistance of 2 &ohm; and inductance of 0.1 mH. The applied voltages is suddenly increased from 10 V to 20 V. After steady state condition have reached, the current is
A.	2 A
B.	more than 2 A but less than 4 A
C.	4 A
D.	more than 4 A
Answer» D. more than 4 A

Discussion

3122.	The frequency at which maximum voltage occurs across the inductance in R-L-C series circuit is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/150-1090-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/150-1090-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/150-1090-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/150-1090-4.png">
Answer» E.

Discussion

3123.	In figure, the value of R should be
A.	5 k&ohm;
B.	50 k&ohm;
C.	20 k&ohm;
D.	10 k&ohm;
Answer» D. 10 k&ohm;

Discussion

3124.	A practical Parallel resonant circuit has a coil in Parallel with a 0.14 f capacitor. The coil has an inductance of 1 mH and a resistance of 10 ohms. The Q of the circuit is
A.	1000
B.	100
C.	10
D.	1
Answer» D. 1

Discussion

3125.	An AC circuit has two branches in parallel. The current in one branch is 5 A. Then the current source
A.	must be less than 5 A
B.	must be more than 5 A
C.	may be equal or more or less than 5 A
D.	5 A
Answer» D. 5 A

Discussion

3126.	Which synthesis procedure requires the use of mutual inductance?
A.	Foster's synthesis
B.	Cauer synthesis
C.	Bott-Duffin synthesis
D.	Brune's synthesis
Answer» E.

Discussion

3127.	KVL equation for the circuit of figure is
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-410-2.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-410-3.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-410-4.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-410-5.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/105-410-5.png">

Discussion

3128.	In figure the rms value is
A.	5
B.	2.5
C.	<span class="root">2.5</span>
D.	<span class="root">50</span>
Answer» E.

Discussion

3129.	Consider the following from the point of view of possible realization as driving point impedances using passive elements Among these
A.	1, 2, 4 are realisable
B.	1, 2, 3 are realisable
C.	3, 4 are realisable
D.	none is realisable
Answer» C. 3, 4 are realisable

Discussion

3130.	In a series RLC circuit the dB level of currents at half power frequencies as compared to current at resonance is
A.	+ 3
B.	- 3
C.	0.5
D.	- 0.5
Answer» C. 0.5

Discussion

3131.	A series RL circuit is initially relaxed. A step voltage is applied to the circuit. If t is the time constant of the circuit, the voltage across R and L will be same at time t equal to
A.	<span class="symbol">t</span>
B.	ln 2
C.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1027-1.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1027-2.png">
E.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/146-1027-3.png">
Answer» B. ln 2

Discussion

3132.	In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Zin =
A.	12/13 &ohm;
B.	13/12 &ohm;
C.	3 &ohm;
D.	4 &ohm;
Answer» B. 13/12 &ohm;

Discussion

3133.	Which of the following frequencies has the greatest period?
A.	20 Hz
B.	200 Hz
C.	20 kHz
D.	200 kHz
Answer» B. 200 Hz

Discussion

3134.	A material for permanent magnet should have
A.	High retentivity
B.	High permeability
C.	Low hysteresis loss
D.	High hysteresis loss
Answer» B. High permeability

Discussion

3135.	A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is
A.	a semi circle in 4th quadrant
B.	a semi circle in first quadrant
C.	a straight line in 4th quadrant
D.	a straight line first quadrant
Answer» C. a straight line in 4th quadrant

Discussion

3136.	Two wires A and B have the same cross-section area and are made of the same material. RA = 600 &ohm; and RB = 100 &ohm;. The number of times A is longer than B is
A.	6
B.	2
C.	4
D.	5
Answer» B. 2

Discussion

3137.	A loudspeaker transformer has a turns ratio of 20 : 1. The speaker impedance is 20&ohm;. Primary impedance of transformer is
A.	10 K
B.	8 K
C.	20 K
D.	0.5 K
Answer» C. 20 K

Discussion

3138.	Assertion (A): The polynomial s3 + 6s2 + 12s + 8 is Hurwitz.Reason (R): In a Hurwitz polynomial all coefficients are non-negative.
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

3139.	A dc network has an open circuit voltage of 5 V. When its terminals are short circuited a current of 5 A flows through the short circuit. If the short circuit is removed and a resistance of 1.5 &ohm; is connected across its terminals, the current will be
A.	1 A
B.	2 A
C.	2.5 A
D.	5 A
Answer» C. 2.5 A

Discussion

3140.	A coil of resistance R and inductance L has a capacitor C in parallel with it. The source frequency is adjusted to a value equal to resonant frequency. Another capacitor C is added in parallel with the above circuit, the source current will
A.	increase
B.	decrease
C.	remain the same
D.	may increase or decrease
Answer» C. remain the same

Discussion

3141.	In the circuit of figure the current through 3 &ohm; resistance at t = is
A.	4 A
B.	2.5 A
C.	3.1 A
D.	0
Answer» C. 3.1 A

Discussion

3142.	A sine wave of voltage varies from zero to maximum of 200V. How much is the voltage at the instant of 30 of the cycle?
A.	50 V
B.	82.8 V
C.	100 V
D.	173.2 V
Answer» D. 173.2 V

Discussion

3143.	In a R-L-C circuit at resonance is
A.	maximum in series resonance and minimum in parallel resonance.
B.	maximum in parallel resonance and minimum in series resonance
C.	minimum in both series and parallel resonances
D.	maximum in both series and parallel resonances.
Answer» B. maximum in parallel resonance and minimum in series resonance

Discussion

3144.	The zeros of a minimum phase function lie on
A.	imaginary axis
B.	left half plane or origin
C.	left half plane or imaginary axis
D.	right half plane or origin
Answer» D. right half plane or origin

Discussion

3145.	A network contains only independent current source and resistors. If the values of all resistors are doubled, the value of the node voltage
A.	will become half
B.	will remain unchange
C.	will become one third
D.	cannot be determined unless the circuit configuration and the values of the resistors are known
Answer» D. cannot be determined unless the circuit configuration and the values of the resistors are known

Discussion

3146.	In figure, the power associated with 3 A source is
A.	36 W
B.	24 W
C.	16 W
D.	8 W
Answer» C. 16 W

Discussion

3147.	Tellegen's theorem is applicable to
A.	circuits with passive elements only
B.	circuits with linear elements only
C.	circuits with time invariant elements only
D.	circuits with active or passive, linear or nonlinear and time invariant or time varying elements
Answer» E.

Discussion

3148.	In figure, i(0-) and v(0-) are zero. The switch is closed at t = 0, i(0+) and ( ) are
A.	3 A and 1.5 A
B.	1.5 A and zero
C.	3 A and zero
D.	1.5 A and 3 A
Answer» D. 1.5 A and 3 A

Discussion

3149.	In the Bode plot, of , the phase at w = 15 is
A.
B.	45
C.	40
D.	36.8
Answer» E.

Discussion

3150.	The inductance of an air cored coil is 2 H. The number of turns is made 3 times, all other quantities remaining the same. The new value of inductance will be 2 2
A.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/89-61-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/89-61-2.png">
C.	6 H
D.	18 H
Answer» E.

Discussion

Explore topic-wise MCQs in Engineering.

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