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51.

Which of the following is an Active element?(a) Resistor(b) Inductor(c) Capacitor(d) OP-AMPThis question was addressed to me during an interview.This interesting question is from Sources and Some Definitions topic in portion Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

The CORRECT CHOICE is (d) OP-AMP

The explanation: OP-AMP is an ACTIVE element because it can be used for the AMPLIFICATION or generation of signals. All the other circuit elements are passive elements.
Discussion
52.

Find the odd one out.(a) Resistor(b) Voltage-dependent resistor(VDR)(c) Temperature-dependent resistor(Thermistor)(d) Light-dependent resistor(LDR)This question was addressed to me during a job interview.Asked question is from Sources and Some Definitions topic in section Circuit Elements and Kirchhoff’s Laws of Network Theory

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Right answer is (a) RESISTOR

The explanation is: A non-linear circuit ELEMENT is one in which the current does not change linearly with the change in applied voltage. Examples of non-linear elements are VDR, thermistor and LDR. Hence resistor is the ODD one.
Discussion
53.

Which of the following is not an example of a linear element?(a) Resistor(b) Thermistor(c) Inductor(d) CapacitorI had been asked this question at a job interview.My question comes from Sources and Some Definitions in chapter Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

The correct option is (b) Thermistor

The explanation: If the resistance, inductance or capacitance OFFERED by an ELEMENT does not change linearly with the change in applied voltage or circuit current, the element is termed as a linear element. Resistor, Inductor and Capacitor are examples of linear ELEMENTS. Thermistor is an EXAMPLE of Non-Linear element.
Discussion
54.

Every circuit is a network, but all networks are not circuits.(a) True(b) FalseI have been asked this question during a job interview.My question is based upon Sources and Some Definitions in division Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

The correct choice is (a) True

The EXPLANATION: The interconnection of TWO or more CIRCUIT elements is called a Network. If the network contains at LEAST one CLOSED path, it is called a Circuit.
Discussion
55.

In CCVS, voltage depends on the control current and the constant called __________(a) Transconductance(b) Transresistance(c) Current Gain(d) Voltage GainI had been asked this question by my school principal while I was bunking the class.I would like to ask this question from Sources and Some Definitions topic in section Circuit Elements and Kirchhoff’s Laws of Network Theory

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The CORRECT answer is (b) Transresistance

Best explanation: In CCVS, voltage is directly proportional to the control current. The CONSTANT of proportionality is called Transresistance(R).

V = RI.
Discussion
56.

The constant gm has dimension of ___________(a) Ampere per volt(b) Ampere(c) Volt(d) Volt per ampereI got this question by my school principal while I was bunking the class.My enquiry is from Sources and Some Definitions topic in chapter Circuit Elements and Kirchhoff’s Laws of Network Theory

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Right ANSWER is (a) AMPERE per VOLT

Easiest explanation: Transconductance is the ratio of current to VOLTAGE. HENCE, the constant gm has a dimension of ampere per volt or siemens (S).
Discussion
57.

Source is a basic network element which supplies power to the networks.(a) True(b) FalseThe question was posed to me during an online exam.My query is from Sources and Some Definitions topic in chapter Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

Correct CHOICE is (b) False

For EXPLANATION: The basic NETWORK element which SUPPLIES ENERGY to the networks is Source. Hence, it is true.
Discussion
58.

The dependent sources are of _____________ kinds.(a) 5(b) 2(c) 3(d) 4I got this question in an online interview.This intriguing question comes from Sources and Some Definitions in section Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer» RIGHT CHOICE is (d) 4

To elaborate: The dependent SOURCES are of four kinds, depending on whether the control VARIABLE is voltage or current and the controlled source is a voltage source or current source. They are VCVS, VCCS, CCVS and CCCS.
Discussion
59.

Which of the following is not the energy stored in a capacitor?(a) \(\frac{CV^2}{2}\)(b) \(\frac{QV}{2}\)(c) \(\frac{Q^2}{2C}\)(d) \(\frac{QC}{2}\)This question was addressed to me in homework.Asked question is from Basic Network Concepts in section Circuit Elements and Kirchhoff’s Laws of Network Theory

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Right ANSWER is (d) \(\frac{QC}{2}\)

The explanation is: ENERGY STORED in a capacitor, E = \(\frac{CV^2}{2}\)

Since C = Q/V

E = \(\frac{CV^2}{2} = \frac{QV}{2} = \frac{QC}{2}\).
Discussion
60.

The capacitance of a capacitor does not depend on the absolute permittivity of the medium between the plates.(a) True(b) FalseThis question was posed to me in a job interview.Asked question is from Basic Network Concepts topic in portion Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

The correct choice is (b) False

To explain I would SAY: C = Ɛ \(\frac{A}{d}\)

Where d is the distance between the PLATES, A is the cross-sectional area of the plates and Ɛ is absolute permittivity of the MEDIUM between the plates.

Hence, the capacitance of a capacitor DEPENDS on the absolute permittivity of the medium between the plates.
Discussion
61.

An inductor of 3mH has a current i = 5(1 – e^-5000t). Find the corresponding maximum energy stored.(a) 37.5 mJ(b) 375 J(c) 37.5 kJ(d) 3.75 mJThis question was addressed to me in class test.The doubt is from Basic Network Concepts in section Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

Correct choice is (a) 37.5 mJ

Best explanation: GIVEN L = 3 mH, i = 5(1 – E^-5000t)

V = L \(\FRAC{DI}{dt} = 3 × 10^{-3} \frac{d}{dt}[5(1-e^{-5000t})] = 75 e^{-5000t}\)

I = i(∞) = 5(1 – e^-∞) = 5 A

E = \(\frac{1}{2}\) LI^2 = 0.5 × 3 × 10^-3 × 5^2 = 37.5 mJ.
Discussion
62.

Energy stored in an inductor is ________(a) LI(b) LI^2(c) LI/2(d) LI^2/2This question was addressed to me during an interview.My question comes from Basic Network Concepts in portion Circuit Elements and Kirchhoff’s Laws of Network Theory

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The CORRECT choice is (d) LI^2/2

The best explanation: V = L \(\frac{di}{DT}\)

DE = Vidt = L \(\frac{di}{dt} IDT\) = Lidt

E = \(\int_0^I dE = \int_0^I Lidt = \frac{1}{2} LI^2\).
Discussion
63.

Inductance of an inductor is inversely proportional to its ___________(a) Number of turns(b) Area of cross section(c) Absolute permeability(d) LengthThis question was posed to me in homework.My question is from Basic Network Concepts in section Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

The correct option is (d) LENGTH

To EXPLAIN I would say: Inductance of an inductor, L = µN^2A/l

From the above equation, Inductance of an inductor is INVERSELY PROPORTIONAL to its length.
Discussion
64.

Unit of inductance is ________(a) Weber(b) Henry(c) Farad(d) TeslaThis question was posed to me during an internship interview.Enquiry is from Basic Network Concepts topic in chapter Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

The CORRECT answer is (B) HENRY

For explanation: The unit of inductance is Henry. Weber is the unit of magnetic flux. Tesla is the unit of flux DENSITY. Farad is the unit of CAPACITANCE.
Discussion
65.

A conductor is said to have resistance of one ohm if a potential difference of one volt across its terminals causes a current of X ampere to flow through it. What will be the value of X?(a) 4(b) 2(c) 3(d) 1I had been asked this question in my homework.My doubt stems from Basic Network Concepts in section Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

Correct option is (d) 1

The BEST explanation: Ohm’s law states that the POTENTIAL difference (voltage) across a conductor is proportional to the current through it. The constant of proportionality is called the Resistance(R).

ACCORDING to Ohm’s law, V = IR (where V is the potential difference between two POINTS which include a resistance R).

–> I = V/R = 1V/1Ω = 1A.
Discussion
66.

A 25 Ω resistor has a voltage of 150 sin377 t. Find the corresponding power.(a) 900 sin^2 337 t(b) 90 sin^2 337 t(c) 900 sin^2 377 t(d) 9 sin^2 337 tThis question was posed to me by my college professor while I was bunking the class.This interesting question is from Basic Network Concepts topic in section Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

Right answer is (c) 900 SIN^2 377 t

The explanation: Given R = 25 Ω and v = 150 sin 377 t

i = \(\frac{v}{R} = \frac{150 sin⁡ 377 t}{25}\) = 6 sin 377 t

p = vi = (150 sin 377 t)(6 sin 377 t) = 900 sin^2 377 t.
Discussion
67.

Energy per unit charge is ____________(a) Power(b) Voltage(c) Current(d) CapacitanceThe question was asked during an interview.I want to ask this question from Basic Network Concepts topic in portion Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

Right answer is (b) Voltage

Explanation: The work or energy PER unit charge utilised in the process of separation of charges is KNOWN as Voltage or Potential difference. The phenomenon of TRANSFER of charge from ONE point to another is termed Current. The rate at which the work is done is called Power. Charge per unit voltage is Capacitance.
Discussion
68.

Resistance depends on the temperature of the conductor.(a) True(b) FalseThis question was posed to me in an interview.Origin of the question is Basic Network Concepts in chapter Circuit Elements and Kirchhoff’s Laws of Network Theory

Answer»

The correct choice is (a) True

Best explanation: Resistance is DIRECTLY proportional to its length, inversely proportional to the AREA of CROSS section of the conductor, depends on the NATURE of the MATERIAL and on the temperature of the conductor.
Discussion