Explore topic-wise MCQs in Engineering.

This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

3251.

A step voltages is applied to RLC series circuit having R = 2 Ω, L = 1 H and C = 1 F. The transient current response will be

A. over damped
B. critically damped
C. under damped
D. any of the above depending the magnitude of voltage
Answer» C. under damped
Discussion
3252.

Class C solid insulators should not be used above 100 C.

A. True
B. False
Answer» C.
Discussion
3253.

Assertion (A): Superposition theorem can be used to find the output of a full wave rectifier excited by sinusoidal signal sources of different frequencies connected in series.Reason (R): Superposition theorem is valid for all linear systems.

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
3254.

The current through a 1 mH inductance is i(t) = 2.56 x 10-2 - 4 x 103 t for 2 t 20 sec. The voltage across the inductor is

A. 4
B. 8
C. 0
D. 8 x 10
E. <sup>3</sup>
Answer» B. 8
Discussion
3255.

Assertion (A): For a physically realisable driving point function, the degree of numerator and denominator should be equal.Reason (R): The sum of positive real functions is real.

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
3256.

For the wave shown in figure, the average value is

A. 7.07 A
B. 5 A
C. 2.5 A
D. 0.5 A
Answer» C. 2.5 A
Discussion
3257.

In the figure circuit, V1 = 40 V. When R is 10 &amp;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
3258.

The Thevenin Resistance of the circuit is

A. 94/7 k&ohm;
B. 54/7 k&ohm;
C. 7/54 k&ohm;
D. 0
Answer» C. 7/54 k&ohm;
Discussion
3259.

In the circuit shown in the given figure, RL will absorb maximum power when its value is

A. 2.75 &ohm;
B. 7.5 &ohm;
C. 25 &ohm;
D. 27 &ohm;
Answer» D. 27 &ohm;
Discussion
3260.

In an RC series circuit excited by dc voltage E, the current at t = 0 is

A. E/R
B. E/C
C. zero
D. infinity
Answer» B. E/C
Discussion
3261.

The current through a 10 &amp;ohm; resistance in a dc circuit having two emf sources is 3A. If this resistance is changed to 20 &amp;ohm;, the new value of current will be

A. less than 3 A
B. equal or less than 3 A
C. equal to or less or more than 3 A
D. 1.5 A
Answer» B. equal or less than 3 A
Discussion
3262.

As per BIS, solid insulators are classified into 6 categories.

A. True
B. False
Answer» C.
Discussion
3263.

Dielectric constant of air is about 5.

A. True
B. False
Answer» C.
Discussion
3264.

Consider the following units sec-1rad2/sec2sec&amp;ohm; The units of , RC and are respectively

A. 1, 2, 4, 3
B. 3, 2, 1, 4
C. 2, 4, 1, 3
D. 1, 2, 3, 4
Answer» E.
Discussion
3265.

An R-L series circuit has R = 5 &amp;ohm; and L = .01 H. It is fed by ac 50 Hz supply. The rms current in the circuit is 5 A. The active power supplied by the source is

A. 25 W
B. 50 W
C. 125 W
D. 250 W
Answer» D. 250 W
Discussion
3266.

In figure, the switch is closed at t = 0. After some time i = 6A and rate of change of current was 4A/s. The value of inductor is

A. 1 H
B. 1.5 H
C. indeterminate
D. 0.5 H
Answer» E.
Discussion
3267.

A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is

A. zero
B. 24.14A
C. 10A
D. 14.14A
Answer» D. 14.14A
Discussion
3268.

In figure the switch has been in position 1 for a long time. At t = 0, the switch is moved to position 2. The equation for transient current is

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/108-453-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/108-453-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/108-453-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/108-453-5.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/108-453-5.png">
Discussion
3269.

Assertion (A): In series R-L-C circuit, the current may lead or lag the voltage depending on the value of R.Reason (R): Phase angle of an R-L series circuit is tan-1 ( L/R).

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
3270.

If P = 250 W and p.f. = 0.707 lagging, Q =

A. 250 vars
B. - 250 vars
C. 176.7 vars
D. - 176.75 vars
Answer» B. - 250 vars
Discussion
3271.

An RLC series circuit is fed form 100 V ac supply. Inductance is 1 H and Q = 7.5. At resonance, the voltage across inductance is

A. 750 V
B. 100 V
C. about 13.5 V
D. 1500 V
Answer» B. 100 V
Discussion
3272.

For an RLC series circuit, Z(s) will be of the form of

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-280-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-280-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-280-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/98-280-4.png">
Answer» E.
Discussion
3273.

If absolute potential of A is - 8 V and that of B is - 16 V, VAB is equal to

A. 24 V
B. 8 V
C. - 8 V
D. - 24 V
Answer» C. - 8 V
Discussion
3274.

An RLC series circuit is excited by 200 V, 100 Hz supply. The current is 20 A. If R = 10 &amp;ohm;, XL = 50 &amp;ohm;, XC is

A. 10 &ohm;
B. 14.14 &ohm;
C. 7.07 &ohm;
D. 50 &ohm;
Answer» E.
Discussion
3275.

For a given voltage four heating coils will give maximum heat when connected

A. in parallel
B. in series
C. with two parallel pairs in series
D. with one pair in parallel and the other two in series
Answer» B. in series
Discussion
3276.

The average value of periodic function v(t) in figure is

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-604-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-604-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-604-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-604-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-604-3.png">
Discussion
3277.

The dual of network in figure is

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-703-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-703-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-703-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-703-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/123-703-3.png">
Discussion
3278.

With Is disconnected I = - 1, when Is = b is connected, the value of I will become

A. 2 A
B. -1 A
C. 1 A
D. 3 A
Answer» D. 3 A
Discussion
3279.

When two port networks are connected in cascade, it is more convenient to use hybrid parameters.

A. True
B. False
Answer» C.
Discussion
3280.

In a resistor the current is i and the voltage is v. The rate of dissipation of heat at any time t is

A. <i>vi</i>
B. <i>vit</i>
C. <i>vt</i>
D. <i>vit</i>
E. <sup>2</sup>
Answer» B. <i>vit</i>
Discussion
3281.

The minimum number of equations required to analyze the circuit shown in the figure is

A. 3
B. 4
C. 6
D. 7
Answer» C. 6
Discussion
3282.

If Z(s) has a pole at origin, the realization leads to

A. a resistance in series
B. an inductance in series
C. a capacitance in series
D. a resistance or capacitance in series
Answer» D. a resistance or capacitance in series
Discussion
3283.

A series resonant circuit has inductance L. If L is increased, the resonant frequency

A. increases
B. decreases
C. remains constant
D. may increases or decreases
Answer» C. remains constant
Discussion
3284.

Three resistances of 15 &amp;ohm;, 10 &amp;ohm; and 3 &amp;ohm; are connected in parallel. The overall resistance is

A. less than 3 &ohm;
B. between 15 and 10 &ohm;
C. between 10 and 3 &ohm;
D. more than 3 &ohm;
Answer» B. between 15 and 10 &ohm;
Discussion
3285.

In figure, the switch is closed at t = 0. At t = 0+ The value of current supplied by battery is

A. 1 A
B. 2 A
C. zero
D. infinity
Answer» B. 2 A
Discussion
3286.

In the circuit shown in the figure the power dissipated in 30 &amp;ohm; resistor will be maximum if the value of R is

A. 30 &ohm;
B. 10 &ohm;
C. 9 &ohm;
D. zero
Answer» E.
Discussion
3287.

In an RLC underdamped circuit

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-500-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-500-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-500-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-500-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/110-500-3.png">
Discussion
3288.

A network has 10 nodes and 17 branches. The number of different node pair are

A. 7
B. 9
C. 10
D. 45
Answer» C. 10
Discussion
3289.

In a series RC circuit Z = (R2 + 2C2)0.5.

A. True
B. False
Answer» C.
Discussion
3290.

The time constant of the network shown in figure is

A. RC
B. 3 RC
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/134-864-2.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/134-864-3.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/134-864-3.png">
Discussion
3291.

The transfer function of an R-L-C circuit given by The Quality factor (Q-factor) of this circuit is

A. 25
B. 100
C. 50
D. 5000
Answer» D. 5000
Discussion
3292.

In the network of the figure is the maximum power is delivered to RL if its value is

A. 16 &ohm;
B. 40/3 &ohm;
C. 60 &ohm;
D. 20 &ohm;
Answer» C. 60 &ohm;
Discussion
3293.

A two-port network is represented by ABCD parameters given byIf port is terminated by RL, then input impedance seen at port 1 is given by

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/143-988-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/143-988-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/143-988-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/143-988-5.png">
Answer» E.
Discussion
3294.

A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is

A. 4
B. 3
C. 2
D. 1
Answer» D. 1
Discussion
3295.

In the circuit, S was initially open. At time t = 0, S is closed. When the current through the inductor is 6 A, the rate of change of current through the resistor is 6 A/s. The value of the inductor would be

A. 1 H
B. 2 H
C. 3 H
D. 4 H
Answer» C. 3 H
Discussion
3296.

The purpose of earthing electric appliances is

A. to provide safety against shock
B. to ensure that appliance works satisfactorily
C. to ensure that appliance gets full voltage
D. all of the above
Answer» B. to ensure that appliance works satisfactorily
Discussion
3297.

A heater is rated at 230 V, 5 A AC. Then

A. both the current and voltage are peak values
B. both the current and voltage are rms values
C. the current is peak value and voltage is rms value
D. the current is rms value and voltage is peak value
Answer» E.
Discussion
3298.

Find Vth in the circuit

A. 100 V
B. 10 V
C. 0 V
D. 5 V
Answer» D. 5 V
Discussion
3299.

KCL is a statement of principle of conservation of energy.

A. True
B. False
Answer» C.
Discussion
3300.

Assertion (A): If A = 0.5 20 , A2 = 0.25 40 .Reason (R): When drawing a phasor diagram, sinusoids may have the same or different frequencies.

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