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.

4451.

Which of the following theorems is a manifestation of law of conservation of energy?

A. Tellegen's theorem
B. Reciprocity theorem
C. Thevenin's theorem
D. Norton's theorem
Answer» B. Reciprocity theorem
Discussion
4452.

An ac circuit has two branches in parallel. The impedances of the two branches are equal. The p.f. of one branch is 0.8 lagging and 0.8 leading. The overall p.f. is

A. zero
B. 0.5 lagging
C. 1
D. 0.7 lagging
Answer» E.
Discussion
4453.

When sources of different frequencies feed a network the only method of solution is superposition theorem.

A. True
B. False
Answer» B. False
Discussion
4454.

In a lead acid battery

A. the numbers of positive and negative plates are equal
B. the number of positive plates may be equal to or more than the number of negative plates
C. the number of positive plates is more than the number of negative plates
D. the number of negative plates is more than the number of positive plates
Answer» E.
Discussion
4455.

The current density J at a point and current I are related as

A. True
B. False
Answer» B. False
Discussion
4456.

For a reactance function H(s), the slope dH (j )/d is

A. 0
B. always positive
C. always negative
D. either 0 or positive
Answer» C. always negative
Discussion
4457.

For an ac circuit having capacitance C, instantaneous current i and instantaneous voltage e are related as

A. True
B. False
Answer» B. False
Discussion
4458.

The relative permeability of an iron specimen is 400 when B = 0.2 T. If B = 0.4 T, r will be

A. 400
B. less than 400
C. more than 400
D. more or less than 400
Answer» E.
Discussion
4459.

If the time is counted from the instant when an ac wave is at its peak value, we get a

A. sine wave
B. cosine wave
C. distorted sine wave
D. none of the above
Answer» C. distorted sine wave
Discussion
4460.

When a circuit is excited by ac sinusoidal source, the admittance is obtained by letting s = j in Y(s).

A. True
B. False
Answer» B. False
Discussion
4461.

An ideal voltage source can not be converted into an equivalent current source.

A. True
B. False
Answer» B. False
Discussion
4462.

In the circuit shown in the given figure, power dissipated in the 5 Ω resistor is

A. zero
B. 80 W
C. 125 W
D. 405 W
Answer» E.
Discussion
4463.

How much r.m.s. current does a 300 W, 200 V bulb take from the 200V, 50 Hz power line?

A. 0.5 A
B. 1.5 A
C. 2 A
D. 3 A
Answer» C. 2 A
Discussion
4464.

In a series R-L-C circuit, the voltage across inductance will be maximum

A. at resonance frequency
B. just before resonant frequency
C. just after resonant frequency
D. none of the above
Answer» D. none of the above
Discussion
4465.

Consider the network graph shown in the figure which one of the following is NOT a 'tree' of graph

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-5.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/141-970-4.png">
Discussion
4466.

Assertion (A): A parallel resonant circuit is also called anti-resonant circuit.Reason (R): In a parallel resonant circuit impedance is maximum at resonance.

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
4467.

Assertion (A): Laplace transform of f(t) = e-at sin t is Reason (R): If Laplace transform of f(t) is F(s), then Laplace transform of e-at f(t) is F(s + a).

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
4468.

A series RLC circuit is overdamped when

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/125-734-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/125-734-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/126-734-3.png">
D. <i>R</i>
E. is infinite
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/126-734-3.png">
Discussion
4469.

The function (s + 2) (s + 4)/[(s + 1)(s + 3)]

A. is a reactance function
B. is an RC function
C. may be a reactance function or an RC function
D. may be RC function or an RL function
Answer» E.
Discussion
4470.

In figure, V1 = 40 V when R = 10 &amp;ohm;, if R = 0, V2 will be

A. 40 V
B. 30 V
C. 20 V
D. 10 V
Answer» D. 10 V
Discussion
4471.

The series element of a band stop filter is

A. capacitive
B. inductive
C. parallel combination of L and C
D. series combination of L and C
Answer» D. series combination of L and C
Discussion
4472.

In using mesh current method it is necessary that at least one mesh current links every element.

A. True
B. False
Answer» B. False
Discussion
4473.

Which one of the following statements is not a property of RL driving point impedance?

A. The first critical frequency at the origin is a zero
B. The last critical frequency is a pole
C. The impedance at S = always less than the impedance at S = zero
D. The slope of the impedance curve is positive at all points
Answer» D. The slope of the impedance curve is positive at all points
Discussion
4474.

In figure, the ratio V24/V23 is

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-652-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-652-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-652-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-652-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/119-652-3.png">
Discussion
4475.

The pass band of a constant k filter with Z1 and Z2 as series and shunt arm impedances is given by

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/126-742-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/126-742-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/126-742-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/126-742-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/126-742-2.png">
Discussion
4476.

The differential equation for the current i(t) in the circuit of the figure is

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/140-963-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/140-963-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/140-963-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/140-963-5.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/140-963-5.png">
Discussion
4477.

For an R-C impedance function, the residues at all poles are

A. real
B. imaginary
C. real and positive
D. positive
Answer» D. positive
Discussion
4478.

In the analogy between electric and magnetic circuits, flux is analogous to

A. current
B. voltage
C. rate of charge of current
D. rate of charge of voltage
Answer» B. voltage
Discussion
4479.

For the two ports in figure, y11 = 8 mho, y12 = y21 = -6 mho and y22 = 6 mho. The values of YA, YB, YC respectively are

A. 2, 6, 6 mho
B. 2, 6, 0 mho
C. 2, 0, 6 mho
D. 2, 6, 8 mho
Answer» D. 2, 6, 8 mho
Discussion
4480.

Vth = 0, if

A. there is no independent source in circuit
B. there is no dependent source in circuit
C. voltage source of infinite magnitude
D. none
Answer» B. there is no dependent source in circuit
Discussion
4481.

The condition AD - BC = 1 for two port network implies that the network is a

A. reciprocal
B. lumped element network
C. lossless network
D. unilateral element network
Answer» B. lumped element network
Discussion
4482.

The distributors for residential areas are

A. single phase
B. three phase three wire
C. three phase 4 wire
D. (a) or (b)
Answer» D. (a) or (b)
Discussion
4483.

In ZRC(s) has a pole at s = 0, the first element in second Foster realization is

A. R
B. C
C. R and C in series
D. R and C in parallel
Answer» B. C
Discussion
4484.

For the mechanical system of figure, the correct differential equation is (where x = displacement in m, M = mass in kg, B = damping constant, N - sec/m K is spring constant, N/m and F = force, newton).

A. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/125-724-2.png">
B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/125-724-3.png">
C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/125-724-4.png">
D. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/125-724-5.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/125-724-3.png">
Discussion
4485.

A delta connection contains three impedances of 60 &amp;ohm; each. The impedances of equivalent star connection will be

A. 15 &ohm;
B. 20 &ohm;
C. 30 &ohm;
D. 40 &ohm;
Answer» C. 30 &ohm;
Discussion
4486.

If then the value of is

A. not determined
B. zero
C. 1
D.
Answer» B. zero
Discussion
4487.

In a discharging R-L circuit voltage across the resistor exhibits

A. a linear rise
B. a linear decay
C. an exponential growth function
D. an exponential decay function
Answer» E.
Discussion
4488.

In solids the current flow is due to electrons only.

A. True
B. False
Answer» B. False
Discussion
4489.

Damping ratio =

A. actual resistance/critical resistance
B. critical resistance/actual resistance
C. critical resistance
D. none of the above
Answer» B. critical resistance/actual resistance
Discussion
4490.

In admittance parameter set, the dependent variables are the currents at the two ports.

A. True
B. False
Answer» B. False
Discussion
4491.

For circuit in figure, which combination of VTH and RTH represents the circuit as seen from ab?

A. 1 V, 10 &ohm;
B. 1 V, 1000 &ohm;
C. 1 mV, 1000 &ohm;
D. 1 mV, 10 &ohm;
Answer» B. 1 V, 1000 &ohm;
Discussion
4492.

A constant k low pass filter has fc = 500 Hz. At f = 1000 Hz, the attenuation is

A. zero
B. infinity
C. may be zero or infinity
D. more than zero but less than infinity
Answer» E.
Discussion
4493.

Which one is correct option? A pure capacitor never dissipates energy, but only stores.Capacitor can store finite amount of energy even cunent is zero.The current through a capacitor is zero if voltage across it d.c.Voltage across a capacitor cannot change instantaneously since it would require an infinite current.qc(0-) = qc(0+)

A. 5, 4, 3, 2
B. 3, 4, 1, 2
C. 2, 4, 3, 1
D. 1, 2, 3, 4, 5
Answer» E.
Discussion
4494.

The capacity of a battery is expressed in terms of

A. current
B. voltage
C. none of these
D. current and voltage
Answer» D. current and voltage
Discussion
4495.

Among the filter, Bessel, Butterworth and chebyshev, the filter with maximally flat response is

A. all
B. butterworth
C. bessel
D. butterworth, Chebyshev
Answer» D. butterworth, Chebyshev
Discussion
4496.

If a two port network is represented by an equivalent T network the admittance of series arm in term of ABCD parameter is equal to

A. C
B. 1/C
C. (A - 1)/B
D. 1/B
Answer» E.
Discussion
4497.

The maximum power that can be transferred to the load is resistor RL from the voltage source in the figure is

A. 1 W
B. 10 W
C. 0.25 W
D. 0.5 W
Answer» D. 0.5 W
Discussion
4498.

The Thevenin equivalent circuit to the left of AB has Req

A. 2 &ohm;
B. 4 &ohm;
C. 1 &ohm;
D. 3 &ohm;
Answer» D. 3 &ohm;
Discussion
4499.

A current increasing at the rate of 1A/s is passed through a 1 H inductor. At t = 0, i = 0. The flux linkages after 1 sec are

A. 0.5 Wb-turn
B. 1 Wb-turn
C. 2 Wb-turn
D. 4 Wb-turn
Answer» E.
Discussion
4500.

At very low frequencies a series R-C circuit behaves as almost purely __________ .

A. resistive
B. inductive
C. capacitive
D. none of the above
Answer» D. none of the above
Discussion