88 + Interview Questions in Simple Dc Networks in Basic Electrical Engineering Page 1 InterviewSolution

1.	Which of the following statements are true about metals?(a) Metals have a positive temperature coefficient(b) Metals have a negative temperature coefficient(c) Metals have zero temperature coefficient(d) Metals have infinite temperature coefficientI got this question during an online interview.My doubt is from Temperature Coefficient of Resistance topic in division Simple DC Networks of Basic Electrical Engineering
Answer» The correct CHOICE is (a) Metals have a positive TEMPERATURE coefficient Explanation: The RESISTANCE of metals increases with an INCREASE in temperature thus, it has a positive temperature coefficient.

Discussion

2.	Calculate the energy in the 10 ohm resistance in 10 seconds.(a) 400J(b) 40kJ(c) 4000J(d) 4kJThis question was addressed to me during an interview.My question comes from Energy topic in section Simple DC Networks of Basic Electrical Engineering
Answer» RIGHT choice is (b) 40kJ The best I can explain: Since the resistors are connected in PARALLEL, the voltage across both the resistors are the same, hence we can USE the expression P=V^2/R. P=200^2/10= 4000W. E=Pt = 4000*10=40000Ws = 40000J = 40kJ.

Discussion

3.	Which among the following is an expression for energy?(a) V^2It(b) V^2Rt(c) V^2t/R(d) V^2t^2/RThe question was asked during an online exam.I want to ask this question from Energy in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The correct OPTION is (c) V^2t/R Explanation: EXPRESSION for POWER = VI, substituting I from ohm’s law we can write, P=V^2/R. Energy is the PRODUCT of power and time, hence E=Pt = V^2t/R.

Discussion

4.	Calculate the current across the 20 ohm resistor.(a) 20A(b) 1A(c) 0.67A(d) 0.33AThis question was addressed to me in class test.This is a very interesting question from Kirchhoff’s Current Law topic in chapter Simple DC Networks of Basic Electrical Engineering
Answer» Right answer is (d) 0.33A The BEST I can explain: ASSUME lower terminal of 20 OHM at 0V and UPPER terminal at V volt and applying KCL, we get V/10 +V/20 =1. V=20/3V So current through 20 ohm = V/20 = (20/3)/20 =1/3=0.33V.

Discussion

5.	Calculate the equivalent resistance between A and B.(a) 6.67 ohm(b) 46.67 ohm(c) 26.67 ohm(d) 10.67 ohmThis question was posed to me during an interview.Asked question is from Series Circuits and Parallel Networks topic in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The CORRECT CHOICE is (a) 6.67 ohm The best explanation: R=20\|\|20\|\|20=6.67 ohm. The three 20 ohm RESISTORS are in parallel and re-sistance is measured ACROSS this TERMINAL.

Discussion

6.	The reciprocal of resistivity is________(a) Conductance(b) Resistance(c) Conductivity(d) ImpedanceThe question was posed to me during an interview.This key question is from Resistivity in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The correct CHOICE is (c) Conductivity To EXPLAIN: The EXPRESSION for RESISTIVITY is = RA/l. The expression for conductivity = Cl/A; C=1/R => Conductivity = l/(AR) = 1/resistivity. Hence, conductivity is the reciprocal of resistivity.

Discussion

7.	Which among the following is a unit for electrical energy?(a) V(volt)(b) kWh(kilowatt-hour)(c) Ohm(d) C(coloumb)This question was addressed to me in a national level competition.My enquiry is from Energy topic in division Simple DC Networks of Basic Electrical Engineering
Answer» Right option is (B) kWh(KILOWATT-hour) To elaborate: Kilowatt is a unit of POWER and hour is a unit of time. Energy is the product of power and time, HENCE the unit for Energy is kWh.

Discussion

8.	A 250V bulb passes a current of 0.3A. Calculate the power in the lamp.(a) 75W(b) 50W(c) 25W(d) 90WI have been asked this question in examination.Origin of the question is Power in section Simple DC Networks of Basic Electrical Engineering
Answer» RIGHT option is (a) 75W Easy EXPLANATION: Here, V = 250V and I = 0.3A. P=VI. Which implies that, P=250*0.3=75W.

Discussion

9.	Which of the following statements are true?(a) Power is proportional to voltage only(b) Power is proportional to current only(c) Power is neither proportional to voltage nor to the current(d) Power is proportional to both the voltage and currentI had been asked this question in an interview.My question is taken from Power topic in portion Simple DC Networks of Basic Electrical Engineering
Answer» RIGHT ANSWER is (d) Power is PROPORTIONAL to both the VOLTAGE and current Best explanation: Power is proportional to both voltage and current.

Discussion

10.	What is the voltage across the 5 ohm resistor if current source has current of 17/3 A?(a) 2.32V(b) 5.21V(c) 6.67V(d) 8.96VI have been asked this question at a job interview.The doubt is from Kirchhoff’s Voltage Law topic in division Simple DC Networks of Basic Electrical Engineering
Answer» Correct choice is (b) 5.21V The EXPLANATION: Assuming I1 and i2 be the CURRENTS in loop 1 and 2 respectively. In loop 1, 4+2i1+3(i1-17/3)+4(i1-i2)+5=0 In loop 2,i2(4+1+5)-4i1-5=0 =>-4i1+10i2=5. Solving these equations simultaneously i2=1.041A and i1=1.352A V=i2*5= 5.21V.

Discussion

11.	Batteries are generally connected in______(a) Series(b) Parallel(c) Either series or parallel(d) Neither series nor parallelThis question was addressed to me at a job interview.I would like to ask this question from Series Circuits and Parallel Networks in section Simple DC Networks of Basic Electrical Engineering
Answer» Correct CHOICE is (a) Series To ELABORATE: BATTERIES are generally CONNECTED in series so that we can obtain the DESIRED voltage since voltages add up once they are connected in series.

Discussion

12.	Many resistors connected in series will?(a) Divide the voltage proportionally among all the resistors(b) Divide the current proportionally(c) Increase the source voltage in proportion to the values of the resistors(d) Reduce the power to zeroThis question was posed to me during an online interview.The question is from Series Circuits in portion Simple DC Networks of Basic Electrical Engineering
Answer» Correct option is (a) Divide the voltage proportionally among all the RESISTORS The best explanation: In a series CIRCUIT, the current remains the same across all resistors HENCE the voltage DIVIDES proportionally among all resistors.

Discussion

13.	Which, among the following is a unit for resistivity?(a) ohm/metre(b) ohm/metre^2(c) ohm-metre(d) ohm-metre^2I got this question during a job interview.My question is taken from Resistivity in section Simple DC Networks of Basic Electrical Engineering
Answer» The correct answer is (c) OHM-metre Easy EXPLANATION: RESISTIVITY = Resistance* Length/area of CROSS section. Unit of resistivity = ohm*(m^2)/m = ohm-m.

Discussion

14.	What is the unit of temperature coefficient?(a) ohm/centigrade(b) ohm-centigrade(c) centigrade^-1(d) centigradeI had been asked this question in semester exam.This interesting question is from Temperature Coefficient of Resistance topic in portion Simple DC Networks of Basic Electrical Engineering
Answer» The correct answer is (c) centigrade^-1 To ELABORATE: R=Reff[1+temp. coeff(T-Teff)]. From the GIVEN EXPRESSION: (R/Reff-1)/(T-Teff) = temp. coeff. HENCE, the UNIT is the reciprocal of that of temperature = centigrade^-1.

Discussion

15.	Calculate the energy in the 5 ohm resistor in 20 seconds.(a) 21.5kJ(b) 2.15kJ(c) 2.15J(d) 21.5kJI got this question in homework.This interesting question is from Energy topic in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The correct OPTION is (a) 21.5kJ For explanation I WOULD say: The current in the circuit is equal to the current in the 5 ohm RESISTOR since it a SERIES connected circuit, hence I=220/(5+10)=14.67A. P=I^2R = 14.67^25=1075.8W. E=Pt = 1075.820 = 21516J=21.5kJ.

Discussion

16.	A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?(a) Both have equal resistance(b) The 2m wire has higher resistance(c) The 5m wire has higher resistance(d) The value of resistance cannot be determined from the given dataThis question was posed to me during an interview for a job.This intriguing question originated from Resistivity in section Simple DC Networks of Basic Electrical Engineering
Answer» The CORRECT choice is (C) The 5m WIRE has higher resistance To explain I would SAY: Resistance is directly proportional to the LENGTH of the wire, hence as the length of the wire increases, resistance increases.

Discussion

17.	Materials which easily allow the passage of electric current are known as ______(a) Insulators(b) Conductors(c) Dielectrics(d) Semi-conductorsI have been asked this question by my school teacher while I was bunking the class.I would like to ask this question from Resistivity in portion Simple DC Networks of Basic Electrical Engineering
Answer» Right option is (B) Conductors To elaborate: Conductors are materials(mostly METALS), which freely allow the passage of electrons through it. If electrons can FLOW freely through a material, it implies that even CURRENT can flow freely through that material SINCE current is the rate of flow of electrons.

Discussion

18.	The sum of the voltages over any closed loop is equal to __________(a) 0V(b) Infinity(c) 1V(d) 2VI got this question by my college director while I was bunking the class.Question is taken from Kirchhoff’s Voltage Law in portion Simple DC Networks of Basic Electrical Engineering
Answer» The correct answer is (a) 0V Easiest explanation: ACCORDING to KVL, the sum of the VOLTAGE over any CLOSED loop is EQUAL to 0.

Discussion

19.	Every____________ is a ____________ but every __________ is not a __________(a) Mesh, loop, loop, mesh(b) Loop, mesh, mesh, loop(c) Loop, mesh, loop, mesh(d) Mesh, loop, mesh, loopI got this question in semester exam.This interesting question is from Kirchhoff’s Voltage Law topic in section Simple DC Networks of Basic Electrical Engineering
Answer» The correct answer is (a) MESH, LOOP, loop, mesh To explain: According to Kirchhoff’s VOLTAGE Law, Every mesh is a loop but every loop is not a mesh. Mesh is a special case of loop which is PLANAR.

Discussion

20.	What happens to the current in the series circuit if the resistance is doubled?(a) It becomes half its original value(b) It becomes double its original value(c) It becomes zero(d) It becomes infinityThis question was posed to me in an interview for internship.My doubt stems from Series Circuits topic in section Simple DC Networks of Basic Electrical Engineering
Answer» Correct option is (a) It becomes half its original value The EXPLANATION: I=V/R. If R becomes 2R then I becomes I/2 i.e. half of its original value.

Discussion

21.	What is the voltage measured across a series short?(a) Infinite(b) Zero(c) The value of the source voltage(d) NullThe question was asked in a national level competition.Query is from Series Circuits in section Simple DC Networks of Basic Electrical Engineering
Answer» Right choice is (b) ZERO To explain: A SHORT is just a wire. The potential difference between TWO points of a wire is zero HENCE the voltage measured is equal to zero.

Discussion

22.	Calculate the resistance between A and B.(a) 3.56 ohm(b) 7 ohm(c) 14.26 ohm(d) 29.69 ohmThis question was addressed to me during an online exam.Enquiry is from Series Circuits and Parallel Networks in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The correct OPTION is (a) 3.56 ohm Explanation: The 1 ohm, 2 ohm and 3 ohm resistors are connected in parallel. Its equivalent resistance is in series with the 4 ohm RESISTOR and the parallel connection of the 5 ohm and 6 ohm resistor. The equivalent resistance of this combination is 80/11 ohm. This is in parallel with 7 ohm to give equivalent resistance between A and B is 3.56 ohm.

Discussion

23.	Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m^2 and 5m^2 respectively.(a) 5:7(b) 2:7(c) 2:5(d) 7:5This question was addressed to me during an online interview.Enquiry is from Resistivity in chapter Simple DC Networks of Basic Electrical Engineering
Answer» Right answer is (c) 2:5 Explanation: Resistivity = R*A/L Since resistance and LENGTH of the two wires are same so resistivity is DIRECTLY proportional to area of CROSS SECTION. Ratio of area is 2:5 so the ratio of resistivity is also 2:5.

Discussion

24.	In a ____________ circuit, the total resistance is smaller than the smallest resistance in the circuit.(a) Series(b) Parallel(c) Either series or parallel(d) Neither series nor parallelI got this question during an interview.I would like to ask this question from Series Circuits and Parallel Networks in division Simple DC Networks of Basic Electrical Engineering
Answer» The correct CHOICE is (B) PARALLEL The EXPLANATION is: in a parallel circuit, the EQUIVALENT resistance=1/sum of the reciprocals of all the resistances in the circuit. Hence it is smaller than the smallest resistance in the circuit.

Discussion

25.	What is the value of x if the current in the circuit is 5A?(a) 15 ohm(b) 25 ohm(c) 55 ohm(d) 75 ohmThe question was asked during an interview.Question is taken from Series Circuits topic in division Simple DC Networks of Basic Electrical Engineering
Answer» The correct answer is (a) 15 ohm Explanation: Total voltage=sum of voltages ACROSS each resistor. =>150=105+55+5*x. Solving the EQUATION, we get x=15 ohm.

Discussion

26.	If the temperature is increased in semi-conductors such that the resistance incessantly falls, it is termed as _______(a) Avalanche breakdown(b) Zener breakdown(c) Thermal runway(d) Avalanche runwayThis question was addressed to me in an international level competition.My question comes from Temperature Coefficient of Resistance in portion Simple DC Networks of Basic Electrical Engineering
Answer» The correct option is (c) Thermal runway Best explanation: When the temperature keeps increasing, the resistance keeps falling continuously and hence the current to INCREASE. This causes the heat in the semi-conductor to rise. This causes the temperature to increase further and the resistance to further decrease. This process CONTINUES and until there is sufficient heat to DESTROY the STRUCTURE of the semi-conductor completely. This is known as a thermal runway.

Discussion

27.	The temperature of a coil cannot be measured by which of the following methods?(a) Thermometer(b) Increase in resistance of the coil(c) Thermo-junctions embedded in the coil(d) CalorimeterI had been asked this question in final exam.The query is from Temperature Coefficient of Resistance in division Simple DC Networks of Basic Electrical Engineering
Answer» The correct ANSWER is (d) CALORIMETER The EXPLANATION is: Calorimeter measures the amount of heat and not the temperature of the coil. The temperature of a coil is mainly measured by THERMOMETER. RESISTANCE of coil increase with an increase in temperature of coil so we can measure temperature using this method. Another method is the formation of thermocouple inside coil due to high temperature at one end and low temperature at other ends.

Discussion

28.	Which of the following statements are true with regard to resistivity?(a) Resistance depends on the temperature(b) Resistance does not depend on the temperature(c) Resistivity depend on the length(d) Resistivity depend on area of cross sectionI have been asked this question during a job interview.The question is from Resistivity topic in portion Simple DC Networks of Basic Electrical Engineering
Answer» The correct ANSWER is (a) Resistance depends on the temperature For EXPLANATION: Resistivity is MATERIAL property. It depends only on temperature. For the same material with DIFFERENT length and area, resistivity remains the same until temperature remains constant.

Discussion

29.	The SI unit of power is?(a) kW(kilo-watt)(b) J/s(joules per second)(c) Ws(watt-second)(d) J/h(joules per hourI got this question in a national level competition.I want to ask this question from Power in section Simple DC Networks of Basic Electrical Engineering
Answer» Correct OPTION is (B) J/s(JOULES PER second) To elaborate: Power = energy/time SI unit of power = SI unit of energy/SI unit of time = joule/second.

Discussion

30.	KVL is applied in ____________(a) Mesh analysis(b) Nodal analysis(c) Both mesh and nodal(d) Neither mesh nor nodalThis question was addressed to me in examination.The above asked question is from Kirchhoff’s Voltage Law topic in chapter Simple DC Networks of Basic Electrical Engineering
Answer» Correct OPTION is (a) MESH analysis Explanation: Mesh analysis helps us to utilize the DIFFERENT VOLTAGES in the circuit as well as the IR products in the circuit which is nothing but KVL.

Discussion

31.	KCL is applied at _________(a) Loop(b) Node(c) Both loop and node(d) Neither loop nor nodeThis question was addressed to me during an internship interview.I'm obligated to ask this question of Kirchhoff’s Current Law topic in section Simple DC Networks of Basic Electrical Engineering
Answer» The correct option is (b) Node The EXPLANATION is: KCL states that the AMOUNT of charge leaving a node is EQUAL to the amount of charge entering it, HENCE it is applied at NODES.

Discussion

32.	Calculate the value of I3, if I1= 2A and I2=3A.(a) -5A(b) 5A(c) 1A(d) -1AI got this question by my school teacher while I was bunking the class.The above asked question is from Kirchhoff’s Current Law topic in chapter Simple DC Networks of Basic Electrical Engineering
Answer» RIGHT OPTION is (a) -5A For EXPLANATION I would SAY: According to KCl, I1+I2+I3=0. HENCE I3=-(I1+I2)=-5A.

Discussion

33.	A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?(a) Both have equal resistance(b) The 10sqm wire has higher resistance(c) The 15sqm wire has higher resistance(d) The value of resistance cannot be determined from the given dataI got this question by my school principal while I was bunking the class.The origin of the question is Resistivity in portion Simple DC Networks of Basic Electrical Engineering
Answer» Correct option is (B) The 10SQM wire has higher resistance To ELABORATE: Resistance is inversely PROPORTIONAL to the area of cross-section. As an area of cross-section increases, resistance DECREASES. Hence the 10sqm wire has a higher resistance than the 15sqm wire.

Discussion

34.	Calculate VAB.(a) 3.5V(b) 12V(c) 9.5V(d) 6.5VI have been asked this question in class test.I'd like to ask this question from Kirchhoff’s Voltage Law in section Simple DC Networks of Basic Electrical Engineering
Answer» Correct OPTION is (a) 3.5V The best I can EXPLAIN: For branch A: VAC=1520/(25+15)=7.5V For branch B: VBC= 1020/(10+40)=4V Applying KVL to loop ABC: VAB+VBC+VCA=0 VAB=3.5V.

Discussion

35.	If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?(a) The other bulb blows out as well(b) The other bulb continues to glow with the same brightness(c) The other bulb glows with increased brightness(d) The other bulb stops glowingI have been asked this question in an internship interview.This interesting question is from Parallel Networks in chapter Simple DC Networks of Basic Electrical Engineering
Answer» Right answer is (b) The other bulb continues to glow with the same brightness To elaborate: If ONE bulb blows out, it acts as an open circuit. Current does not flow in that branch but it continues to flow in the other branch of the parallel circuit. HENCE the other bulb continues to glow. Also the VOLTAGE across other bulb remains the same DUE to which POWER delivered to it remains the same so it continues to glow with the same brightness.

Discussion

36.	Find the voltage across the 6 ohm resistor.(a) 150V(b) 181.6V(c) 27.27V(d) 54.48VThe question was asked in homework.This question is from Series Circuits in portion Simple DC Networks of Basic Electrical Engineering
Answer» CORRECT answer is (C) 27.27V To explain: Total current I=150/(6+12+15)=(150/33)V. V across 6 OHM = 6I = 6(150/33)V = 27.27V.

Discussion

37.	A wire has the same resistance as the one given in the figure. Calculate its resistivity if the length of the wire is 10m and its area of cross section is 2m.(a) 16 ohm-metre(b) 8 ohm-metre(c) 16 kiloohm-metre(d) 8 kiloohm-metreI had been asked this question in homework.The doubt is from Resistivity topic in division Simple DC Networks of Basic Electrical Engineering
Answer» CORRECT answer is (b) 8 ohm-metre The EXPLANATION is: From the given circuit, R=V/I = 200/5 = 40ohm. Resistivity= RESISTANCEArea of cross SECTION/ LENGTH of the wire. Resistivity= 402/10= 8 ohm-metre.

Discussion

38.	Calculate the energy dissipated by the circuit in 50 seconds.(a) 50kJ(b) 50J(c) 100j(d) 100kJI had been asked this question at a job interview.I want to ask this question from Energy topic in section Simple DC Networks of Basic Electrical Engineering
Answer» Correct choice is (a) 50KJ The best I can EXPLAIN: Here V = 100 and R = 10. Power in the circuit= V^2/R = 100^2/10 = 1000W. Energy= Pt= 1000*50 = 50000J = 50kJ.

Discussion

39.	Calculate the power across each 10 ohm resistance.(a) 1000kW, 1000kW(b) 1kW, 1kW(c) 100W, 100W(d) 100kW, 100kWI got this question during an interview.Origin of the question is Power topic in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The correct choice is (b) 1kW, 1kW Explanation: This is PARALLEL connected circuit, HENCE the VOLTAGE across each of the RESISTORS is the same. P =(V^2)/R=(100^2)/10 = 1000W=1kW. Since both the resistors receive the same AMOUNT of voltage, the power in both is the same.

Discussion

40.	Find the value of v if v1=20V and value of current source is 6A.(a) 10V(b) 12V(c) 14V(d) 16VThis question was addressed to me in a national level competition.My doubt is from Kirchhoff’s Current Law in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The correct CHOICE is (b) 12V The best EXPLANATION: The CURRENT through the 10 OHM resistor=v1/10=2A.Applying KCL at node 1: i5=i10+i2. i2=6-2=4A. Thus the drop in the 2 ohm resistor = 4×2 = 8V. v1=20V; hence v2=20-v across 2 ohm resistor=20-8=12V v2=v since they are connected in parallel. v=12V.

Discussion

41.	KCL deals with the conservation of?(a) Momentum(b) Mass(c) Potential Energy(d) ChargeI have been asked this question in semester exam.My question is based upon Kirchhoff’s Current Law in section Simple DC Networks of Basic Electrical Engineering
Answer» The CORRECT option is (d) Charge Easy explanation: KCL states that the amount of charge ENTERING a junction is EQUAL to the amount of charge leaving it, HENCE it is the conservation of charge.

Discussion

42.	The total resistance between A and B are?(a) 20 ohm(b) 5 ohm(c) 80 ohm(d) 0 ohmThe question was posed to me during a job interview.The above asked question is from Parallel Networks in section Simple DC Networks of Basic Electrical Engineering
Answer» The correct option is (b) 5 ohm To explain: The RESISTORS are connected in PARALLEL, hence the equivalent RESISTANCE = 1/(1/20+1/20+1/20+1/20)=5A.

Discussion

43.	The voltage across the open circuit is?(a) 100V(b) Infinity(c) 90V(d) 0VThis question was addressed to me in an interview for job.This interesting question is from Parallel Networks topic in division Simple DC Networks of Basic Electrical Engineering
Answer» Correct choice is (a) 100V For explanation: The voltage across all BRANCHES in a PARALLEL circuit is the same as that of the SOURCE voltage. HENCE the voltage across the 10 ohm resistor and the open circuit is the same=100V.

Discussion

44.	A voltage across a series resistor circuit is proportional to?(a) The amount of time the circuit was on for(b) The value of the resistance itself(c) The value of the other resistances in the circuit(d) The power in the circuitThe question was asked during an online interview.Asked question is from Series Circuits topic in chapter Simple DC Networks of Basic Electrical Engineering
Answer» Right option is (b) The value of the RESISTANCE itself The best explanation: V=IR hence the VOLTAGE across a series RESISTOR circuit is proportional to the value of the resistance.

Discussion

45.	In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etcetera?(a) Voltage(b) Current(c) Both voltage and current(d) Neither voltage nor currentThe question was posed to me in exam.The question is from Series Circuits topic in section Simple DC Networks of Basic Electrical Engineering
Answer» RIGHT choice is (b) Current The best I can EXPLAIN: In a SERIES circuit, the current across all elements remain the same and the total voltage of the circuit is the sum of the voltages across all the elements.

Discussion

46.	The resistance of insulators __________(a) Increases with an increase in temperature(b) Decreases with an increase in temperature(c) Remains the same with an increase in temperature(d) Becomes zero with an increase in temperatureThe question was asked in a job interview.Enquiry is from Temperature Coefficient of Resistance topic in division Simple DC Networks of Basic Electrical Engineering
Answer» The correct ANSWER is (b) Decreases with an increase in temperature Explanation: In the case of an insulator, the energy gap between the conduction band and the valence band is very large. When the temperature is increased, the ELECTRONS move from the conduction band to the valence band and HENCE it starts CONDUCTING. When conductance increases, resistance decreases, since C=1/R. THUS, when the temperature increases, resistance decreases in insulators.

Discussion

47.	Practically, if 10kJ of energy is supplied to a device, how much energy will the device give back?(a) Equal to10kJ(b) Less than 10kJ(c) More than 10kJ(d) ZeroI got this question in quiz.My question is from Energy in section Simple DC Networks of Basic Electrical Engineering
Answer» The correct choice is (b) LESS than 10kJ Easiest explanation: Practically, if 10kJ of ENERGY is supplied to a SYSTEM, it RETURNS less than the supplied energy because, some of the energy is lost as heat energy, SOUND energy etc.

Discussion

48.	Calculate the total resistance between the points A and B.(a) 7 ohm(b) 0 ohm(c) 7.67 ohm(d) 0.48 ohmI have been asked this question by my college director while I was bunking the class.Question is taken from Series Circuits and Parallel Networks in chapter Simple DC Networks of Basic Electrical Engineering
Answer» The correct CHOICE is (c) 7.67 OHM To explain: 1 ohm in parallel with 2 ohm give 2/3 ohm equivalent which is in series with 4 ohm and 3 ohm so total RESISTANCE between A and B = 4 + 2/3 + 3 = 23/3 = 7.67 ohm.

Discussion

49.	If there are two bulbs connected in series and one blows out, what happens to the other bulb?(a) The other bulb continues to glow with the same brightness(b) The other bulb stops glowing(c) The other bulb glows with increased brightness(d) The other bulb also burns outI got this question in semester exam.I'm obligated to ask this question of Series Circuits in section Simple DC Networks of Basic Electrical Engineering
Answer» Right CHOICE is (b) The other bulb STOPS glowing For EXPLANATION: Since the two bulbs are CONNECTED in series, if the first bulb burns out there is a break in the circuit and hence the SECOND bulb does not glow.

Discussion

50.	Voltage across the 60ohm resistor is______(a) 72V(b) 0V(c) 48V(d) 120VThis question was posed to me in semester exam.My enquiry is from Series Circuits in portion Simple DC Networks of Basic Electrical Engineering
Answer» Right option is (b) 0V To explain I would SAY: The 60ohm resistance is SHORTED SINCE current always choses the low resistance path. VOLTAGE across short CIRCUIT is equal to zero, hence voltage across the resistor is 0.

Discussion

Explore topic-wise InterviewSolutions in .

Calculate the energy in the 10 ohm resistance in 10 seconds.(a) 400J(b) 40kJ(c) 4000J(d) 4kJThis question was addressed to me during an interview.My question comes from Energy topic in section Simple DC Networks of Basic Electrical Engineering

Which among the following is an expression for energy?(a) V^2It(b) V^2Rt(c) V^2t/R(d) V^2t^2/RThe question was asked during an online exam.I want to ask this question from Energy in chapter Simple DC Networks of Basic Electrical Engineering

Calculate the current across the 20 ohm resistor.(a) 20A(b) 1A(c) 0.67A(d) 0.33AThis question was addressed to me in class test.This is a very interesting question from Kirchhoff’s Current Law topic in chapter Simple DC Networks of Basic Electrical Engineering

Calculate the equivalent resistance between A and B.(a) 6.67 ohm(b) 46.67 ohm(c) 26.67 ohm(d) 10.67 ohmThis question was posed to me during an interview.Asked question is from Series Circuits and Parallel Networks topic in chapter Simple DC Networks of Basic Electrical Engineering

The reciprocal of resistivity is________(a) Conductance(b) Resistance(c) Conductivity(d) ImpedanceThe question was posed to me during an interview.This key question is from Resistivity in chapter Simple DC Networks of Basic Electrical Engineering

Which among the following is a unit for electrical energy?(a) V(volt)(b) kWh(kilowatt-hour)(c) Ohm(d) C(coloumb)This question was addressed to me in a national level competition.My enquiry is from Energy topic in division Simple DC Networks of Basic Electrical Engineering

A 250V bulb passes a current of 0.3A. Calculate the power in the lamp.(a) 75W(b) 50W(c) 25W(d) 90WI have been asked this question in examination.Origin of the question is Power in section Simple DC Networks of Basic Electrical Engineering

What is the voltage across the 5 ohm resistor if current source has current of 17/3 A?(a) 2.32V(b) 5.21V(c) 6.67V(d) 8.96VI have been asked this question at a job interview.The doubt is from Kirchhoff’s Voltage Law topic in division Simple DC Networks of Basic Electrical Engineering

Which, among the following is a unit for resistivity?(a) ohm/metre(b) ohm/metre^2(c) ohm-metre(d) ohm-metre^2I got this question during a job interview.My question is taken from Resistivity in section Simple DC Networks of Basic Electrical Engineering

What is the unit of temperature coefficient?(a) ohm/centigrade(b) ohm-centigrade(c) centigrade^-1(d) centigradeI had been asked this question in semester exam.This interesting question is from Temperature Coefficient of Resistance topic in portion Simple DC Networks of Basic Electrical Engineering

Calculate the energy in the 5 ohm resistor in 20 seconds.(a) 21.5kJ(b) 2.15kJ(c) 2.15J(d) 21.5kJI got this question in homework.This interesting question is from Energy topic in chapter Simple DC Networks of Basic Electrical Engineering

The sum of the voltages over any closed loop is equal to __________(a) 0V(b) Infinity(c) 1V(d) 2VI got this question by my college director while I was bunking the class.Question is taken from Kirchhoff’s Voltage Law in portion Simple DC Networks of Basic Electrical Engineering

Every is a but every is not a (a) Mesh, loop, loop, mesh(b) Loop, mesh, mesh, loop(c) Loop, mesh, loop, mesh(d) Mesh, loop, mesh, loopI got this question in semester exam.This interesting question is from Kirchhoff’s Voltage Law topic in section Simple DC Networks of Basic Electrical Engineering

What is the voltage measured across a series short?(a) Infinite(b) Zero(c) The value of the source voltage(d) NullThe question was asked in a national level competition.Query is from Series Circuits in section Simple DC Networks of Basic Electrical Engineering

Calculate the resistance between A and B.(a) 3.56 ohm(b) 7 ohm(c) 14.26 ohm(d) 29.69 ohmThis question was addressed to me during an online exam.Enquiry is from Series Circuits and Parallel Networks in chapter Simple DC Networks of Basic Electrical Engineering

What is the value of x if the current in the circuit is 5A?(a) 15 ohm(b) 25 ohm(c) 55 ohm(d) 75 ohmThe question was asked during an interview.Question is taken from Series Circuits topic in division Simple DC Networks of Basic Electrical Engineering

The SI unit of power is?(a) kW(kilo-watt)(b) J/s(joules per second)(c) Ws(watt-second)(d) J/h(joules per hourI got this question in a national level competition.I want to ask this question from Power in section Simple DC Networks of Basic Electrical Engineering

KVL is applied in ____________(a) Mesh analysis(b) Nodal analysis(c) Both mesh and nodal(d) Neither mesh nor nodalThis question was addressed to me in examination.The above asked question is from Kirchhoff’s Voltage Law topic in chapter Simple DC Networks of Basic Electrical Engineering

KCL is applied at _________(a) Loop(b) Node(c) Both loop and node(d) Neither loop nor nodeThis question was addressed to me during an internship interview.I'm obligated to ask this question of Kirchhoff’s Current Law topic in section Simple DC Networks of Basic Electrical Engineering

Calculate the value of I3, if I1= 2A and I2=3A.(a) -5A(b) 5A(c) 1A(d) -1AI got this question by my school teacher while I was bunking the class.The above asked question is from Kirchhoff’s Current Law topic in chapter Simple DC Networks of Basic Electrical Engineering

Calculate VAB.(a) 3.5V(b) 12V(c) 9.5V(d) 6.5VI have been asked this question in class test.I'd like to ask this question from Kirchhoff’s Voltage Law in section Simple DC Networks of Basic Electrical Engineering

Find the voltage across the 6 ohm resistor.(a) 150V(b) 181.6V(c) 27.27V(d) 54.48VThe question was asked in homework.This question is from Series Circuits in portion Simple DC Networks of Basic Electrical Engineering

Calculate the energy dissipated by the circuit in 50 seconds.(a) 50kJ(b) 50J(c) 100j(d) 100kJI had been asked this question at a job interview.I want to ask this question from Energy topic in section Simple DC Networks of Basic Electrical Engineering

Calculate the power across each 10 ohm resistance.(a) 1000kW, 1000kW(b) 1kW, 1kW(c) 100W, 100W(d) 100kW, 100kWI got this question during an interview.Origin of the question is Power topic in chapter Simple DC Networks of Basic Electrical Engineering

Find the value of v if v1=20V and value of current source is 6A.(a) 10V(b) 12V(c) 14V(d) 16VThis question was addressed to me in a national level competition.My doubt is from Kirchhoff’s Current Law in chapter Simple DC Networks of Basic Electrical Engineering

KCL deals with the conservation of?(a) Momentum(b) Mass(c) Potential Energy(d) ChargeI have been asked this question in semester exam.My question is based upon Kirchhoff’s Current Law in section Simple DC Networks of Basic Electrical Engineering

The total resistance between A and B are?(a) 20 ohm(b) 5 ohm(c) 80 ohm(d) 0 ohmThe question was posed to me during a job interview.The above asked question is from Parallel Networks in section Simple DC Networks of Basic Electrical Engineering

The voltage across the open circuit is?(a) 100V(b) Infinity(c) 90V(d) 0VThis question was addressed to me in an interview for job.This interesting question is from Parallel Networks topic in division Simple DC Networks of Basic Electrical Engineering

Practically, if 10kJ of energy is supplied to a device, how much energy will the device give back?(a) Equal to10kJ(b) Less than 10kJ(c) More than 10kJ(d) ZeroI got this question in quiz.My question is from Energy in section Simple DC Networks of Basic Electrical Engineering

Voltage across the 60ohm resistor is______(a) 72V(b) 0V(c) 48V(d) 120VThis question was posed to me in semester exam.My enquiry is from Series Circuits in portion Simple DC Networks of Basic Electrical Engineering