IMPORTANT INTERVIEW QUESTIONS FOR ECE 1 . What is the color code for a 220 5% resistor? A . Red, Red, Brown, Gold B . Orange, Orange, Black, Gold C . Red, Red, Black, Gold D . Red, Red, Brown, Silver Answer & Explanation Answer: Option A Explanation: Resistor colour coding series: Black 0 Brown 1 Red 2 Orange 3 Yellow 4 Green 5 Blue 6 Violet 7 Gray 8 White 9 None 20% Silver 10% Gold 5% Therefore Red, Red, Brown, Gold 2 2 10 1 5% = 22 x 10 = 220 ohm 5% (tolerance). 2 . If 60 J of energy are available for every 15 C of charge, what is the voltage? A . 4 V B 60 V 1
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
1.
What is the color code for a 220 5% resistor?A. Red, Red, Brown, Gold
B. Orange, Orange, Black, Gold
C. Red, Red, Black, Gold
D. Red, Red, Brown, Silver
Answer & Explanation
Answer: Option A
Explanation:
Resistor colour coding series:
Black 0 Brown 1 Red 2 Orange 3 Yellow 4 Green 5 Blue 6 Violet 7 Gray 8 White 9 None 20% Silver 10% Gold 5%
Therefore Red, Red, Brown, Gold 2 2 101 5%
= 22 x 10 = 220 ohm 5% (tolerance).
2. If 60 J of energy are available for every 15 C of charge, what is the voltage?A.4 VB.60 VC.15 VD.0.25 V
3. An atom's atomic number is determined by the number of:A.neutrons minus protonsB.protonsC.electronsD.neutrons
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
4. A voltage will influence current only if the circuit is:A.openB.insulatedC.high resistanceD.closed
5. Which resistive component is designed to be temperature sensitive?A.ThermistorB.RheostatC.PotentiometerD.Photoconductive cell
6. The battery symbol is:A.
B.
C.D.
7. What type of switch is this?
A.push buttonB.SPSTC.DPDTD.SPDT
8. Primary batteries, unlike secondary batteries, may be:A.charged onceB.used onceC.recharged over and overD.stored indefinitelyAnswer & Explanation
Answer: Option B
Explanation:
Primary batteries (disposable batteries), which are designed to be used once and discarded when they are exhausted.
Secondary batteries (rechargeable batteries), which are designed to be recharged and used multiple times.
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
9. In practical applications, battery voltage:A.is restored as soon as disconnect occursB.is lowered as the load increasesC.may be stored indefinitelyD.will be reduced to zero as power is drawn
10. The negative and positive charge symbols are assigned (in that order) to the:A.proton and electronB.electron and protonC.atom and nucleusD.electron and element
11. A voltmeter is used:A.to measure currentB.in series with the circuitC.in parallel with the circuitD.to measure coulombs
12. If the current in a circuit equals 0 A, it is likely that theA.voltage is too highB.resistance is too lowC.circuit has a shortD.circuit is open
13. Current equals:
A.
B.coulombs × time
C.
D.voltage × time
14. What are the unit and symbol for current?A.Ampere, AB.Coulomb, IC.Ampere, QD.Ampere, I
15. Which part of an atom has no electrical charge?A.ElectronB.NeutronC.ProtonD.All of the above
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
16. Which voltage source converts chemical energy to electrical energy?A.Electrical generatorB.BatteryC.Solar cellD.Electronic power supply
17. An example of potential energy is:A.tea-kettle steamB.a moving vehicleC.the sunD.a battery
18. If 40 C of charge flow past a point in 20 s, what is the current?A.2 A B.0.5 AC.20 A D.40 A
19. Batteries differ from fuel cells in thatA.a battery is a closed systemB.a battery uses hydrogen and oxygen to create electricityC.a battery uses a polymer electrolyte membraneD.none of the above
20. The removal of a non-neutral subatomic particle converts the atom into a:A.charged ionB.nucleusC.heavier elementD.compound
21. One coulomb passing a point in one second is one:A.ampere B.voltC.ohm D.charge
22. In which states may matter may be found?A.solid, liquid, or mineralB.solid, gas, or liquidC.mineral, gas, or liquidD.plastic, solid, or gas
23. Material that consists of a mixture of elements is considered to be:A.an element B.an ionC.a compound D.a molecule
24. How many valence shell electrons are there in semiconductor atoms?A.16 B.8C.4 D.2
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
25. When considering conventional current versus electron current flow:A.electron current flow came firstB.protons move in conventional current flowC.conventional current flow came firstD.the direction of current is the same in both methods
26. Which unit of charge contains 6.25 × 1018 electrons?A.An ampere B.A coulombC.A volt D.A joule
27. A switch is a device that:A.short circuits complex circuitsB.holds a fuseC.has double polesD.opens or completes a current path
28. The term used to designate electrical pressure is:A.voltage B.currentC.resistance D.conductance
29. Which electronics material opposes the movement of free electrons?A.Conductor B.InsulatorC.Semiconductor D.Element
30. Current is considered as the movement of:A.electrons B.protonsC.charge D.nuclei
31. A lead-acid battery is an example of aA.solar cellB.fuel cellC.primary batteryD.secondary battery
32. The charge of one coulomb is equal to:A.6.24 x 10−18 electronsB.one ampereC.one secondD.6.24 x 1018 electrons
33. A basic electric circuit is made up of what components?A.A load, a resistor, and a conductive path for currentB.A voltage source, a load, and a conductive path for currentC.A voltage source, a conductive path for current, and a batteryD.A conductive path for current, a battery, and a copper wire
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
34. An ammeter is used to measureA.voltage B.currentC.resistance D.All of the above
35. What is the name of the pressure that moves electrons in a closed circuit?A.amperes B.ohmsC.voltage D.coulombs
36. What is a characteristic of a secondary cell?A.rechargeabilityB.not rechargeableC.a dry cellD.non-liquid
37. What are the basic building blocks that all matter is composed of?A.electrons, neutrons, and protonsB.two protons for each neutronC.two protons for each electronD.electrons, neutrons, and charged ions
38. If a fluid system is compared to an electrical system, the fluid pump will correspond to a:A.conductor B.lampC.battery D.insulator
39. An element is a substance that is:A.varied throughout the entire pieceB.used only in electronicsC.electrically chargedD.found only in its pure form
40. Current is:A.the presence of a positive chargeB.the abundance of electronsC.the movement of electronsD.the repulsion of electrons
41. What do you call a diagram that shows the electrical connections of a circuit's components?A.A schematic diagramB.A pictorial diagramC.A block diagramD.An electrical diagram
42. A short circuit will have:A.a small current flowB.a large current flowC.no current flowD.some current flow
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
43. The basic difference between a fuse and a circuit breaker isA.a fuse is slowerB.a fuse is reusableC.a circuit breaker is reusableD.a circuit breaker is more reliable
44. Which is the smallest?A.atom B.protonC.neutron D.electron
45. A secondary cell generates dc via chemical activity; a primary cell generates dc:A.electrically B.thermallyC.optically D.chemically
46. Which of the following statements is true?A.Unlike charges repel and like charges attract.B.Like charges repel and unlike charges attract.C.Unlike charges attract and like charges attract.D.Like charges repel and unlike charges repel.
47. If an electrical system is compared to a fluid system, the electrical current corresponds to the:A.pressure B.pumpC.water wheel D.water flow
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
1. When parallel resistors are of three different values, which has the greatest power loss?A.The smallest resistanceB.The largest resistanceC.They have the same power loss.D.Voltage and resistance values are needed.
2. What is the product-over-sum result of 150 and 6800?A.150 B.146.7C.0.006 D.6800
3. The voltage across any branch of a parallel circuit:A.varies as the total current variesB.is inversely proportional to total circuit resistanceC.is equally applied to all branch conductancesD.is dropped in proportion to each branch resistance
4. What is the total power loss if 2 k and 1 k parallel-connected resistors have an IT of 3 mA?A.6 W B.36 WC.6 mW D.36 mW
5. What happens to total resistance in a circuit with parallel resistors if one of them opens?A.It increases. B.It halves.C.It remains the same. D.It decreases.
6. Components that connect in parallel form:A.branches B.open circuitsC.short circuits D.a voltage dividerView Answer Workspace Report Discuss in Forum
7. A parallel circuit differs from a series circuit in that a parallel circuit hasA.no path for current flowB.fewer paths for current flowC.one path for current flowD.more than one path for current flowView Answer Workspace Report Discuss in Forum
In the given circuit, Channel 1 of the stereo amplifier outputs 12 V to the speakers. How much total current is the amplifier providing to the speakers?A.0 AB.1.5 AC.3 AD.More information is needed to find the total current provided to the speakers.View Answer Workspace Report Discuss in Forum
9. If two parallel-connected resistors dissipate 6 watts and 10 watts of power, then what is the total power loss?A.3.75 watts B.4 wattsC.16 watts D.60 wattsView Answer Workspace Report Discuss in Forum
What would these meter readings indicate about the circuit in the given circuit?
Meter Readings: I = 7.6 mA, V = 12 VA.R1 is open.B.R2 is open.C.The fuse is open.D.The circuit is operating normally.
12.
In the given circuit, Channel 1 of the stereo amplifier outputs 12 V to the speakers. How much total power is the amplifier delivering to the speakers?A.0 WB.18 WC.36 WD.More information is needed to find the total power delivered to the speakers.
13. If a 1 k and a 2 k resistor are parallel-connected across a 12 V supply, how much current is received by the 2 k resistor?A.4 mA B.6 mAC.8 mA D.12 mA
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
14.
What does VS equal in the given circuit?A.0 VB.9 VC.27 VD.More information is needed to find VS.
15. The current through R1 will be:
A.128 mA B.88 mAC.48 mA D.2.2 mA
16. The voltage read by the voltmeter will be:
A.24 V B.12 VC.6 V D.4 V
17. Which component is of the wrong value?
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
A.R1 B.R2C.R3 D.R4
18.
What does I3 equal in the given circuit?A.5 mA B.45 mAC.50 mA D.100 mA
19. What is the total power of the circuit?
A.2.2 W B.4.2 WC.6.2 W D.8.2 W
20. What are the individual values of two parallel resistors whose RT is 8 ohms, when one has double the resistance of the other?
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
A.2.7 ohms and 5.3 ohmsB.8 ohms and 16 ohmsC.10 ohms and 20 ohmsD.12 ohms and 24 ohms
21. When a parallel 5 k resistor and a 25 k resistor have a 10 V supply, what is the total power loss?A.2.4 mW B.3.3 mWC.24 mW D.33 mW
22. In a parallel resistive circuit:A.there is more than one current path between two pointsB.the voltage applied divides between the branchesC.the total branch power exceeds the source powerD.the total circuit conductance is less than the smallest branch conductance
23. What is the total resistance?
A.7 k B.1 kC.706 D.353
24. Kirchhoff's current law for parallel circuits states that the:A.sum of all branch voltages equals zeroB.total circuit resistance is less than the smallest branch resistorC.sum of currents into a junction is equal to the difference of all the branch currents
D.sum of the total currents flowing out of a junction equals the sum of the total currents flowing into that junction
25. Which component is open?
A.R1 B.R2
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
C.R3 D.R426.
What would these meter readings indicate about the circuit in the given circuit?
Meter Readings: I = 0 mA, V = 0 VA.R1 is open.B.R2 is open.C.The fuse is open.D.The circuit is operating normally.
27. If 550 mA of current leaves a node that had 250 mA entering from one branch, how much current would enter from the other?A.250 mA B.300 mAC.550 mA D.800 mA
28.
What would these meter readings indicate about the circuit in the given circuit?
Meter Readings: I = 10 mA, V = 12 VA.R1 is open.
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
B.R2 is open.C.The fuse is open.D.The circuit is operating normally.
29.
What does RT equal in the given circuit?A.90 B.180 C.200 D.1.8 k
30. What procedure should be followed when troubleshooting with an ammeter or voltmeter?A.Short the leads and adjust.B.Check the meter’s external power supply.C.Start with the highest scale and adjust down to a lower scale.D.Start with the lowest scale and adjust up to a higher scale.
31. A parallel circuit is also used as a divider for:A.conductance B.voltageC.power D.current
32. What is RT for a 12 k , a 4 k , and a 3 k resistor in parallel?A.1.5 k B.2 kC.6.3 k D.19 k
33. What is the total resistance of four 1 k parallel-connected resistors?A.200 ohms B.250 ohmsC.400 ohms D.4 kilohms
34. Which are the better test devices used to isolate a suspected open component within a parallel circuit?A.a voltmeter or an ohmmeterB.neither an ammeter nor a voltmeterC.a wattmeter or a voltmeterD.an ammeter or an ohmmeter
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
35.
What does P2 equal in the given circuit?A.45 mW B.405 mWC.450 mW D.900 mW
36.
What does R1 equal in the given circuit?A.90 B.180 C.200 D.1.8 kView Answer Workspace Report Discuss in Forum
A.1.045 k B.1.545 kC.2.045 k D.2.545 kView Answer Workspace Report Discuss in Forum
38. What is RT for fifteen 2 M resistors all connected in parallel?A.133 k B.300 kC.750 k D.30 MView Answer Workspace Report Discuss in Forum
39. Which is considered to be the common reference for a parallel circuit?A.Voltage B.CurrentC.Power D.Resistance
1. In a 20 Vac series RC circuit, if 20 V is measured across the resistor and 40 V is measured across the capacitor, the applied voltage is:A.45 VB.50 VC.55 VD.60 V
2. Select the equation below that represents the relationship between charge, capacitance, and voltage for a capacitor.A.Q = CVB.C = QV
A.when the voltage across its plates is of the voltage from ground to one of its platesB.when the current through the capacitor is the same as when the capacitor is dischargedC.when the voltage across the plates is 0.707 of the input voltageD.when the current through the capacitor is directly proportional to the area of the plates
4.
What is the reactive power in the given circuit?A.0 VARB.691 VARC.44.23 mVARD.1.45 kVAR
5. What is the angle theta value for a 5.6 F capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 Vac source?A.27.3 degreesB.62.7 degreesC.–27.3 degreesD.–62.7 degrees
6. When a 4.7 F capacitor is connected to a 1 kHz source, what is its capacitive reactance?A.4.7 ohmsB.29.5 ohmsC.34 ohmsD.213 ohms
9. After which time constant can a capacitor be considered to be fully charged?A.first B.thirdC.fifth D.seventh
10. You could increase the time constant of an RC circuit byA.adding a resistor in parallel with the circuit resistanceB.adding a capacitor in parallel with the circuit capacitanceC.increasing the amplitude of the input voltageD.exchanging the position of the resistor and capacitor in the circuit
11. A capacitor's rate of charge is considered:A.magneticB.a current blockC.linearD.exponential
12. A resistor and an output capacitor form a series circuit with a square wave applied. The circuit is:A.an integratorB.a differentiatorC.a multiplierD.a divider
13. If an open capacitor is checked with an ohmmeter, the needle will:A.stay on zeroB.stay on infinityC.move from zero to infinityD.move from infinity to zero
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
14. What is the circuit's total current?
A.4.57 mAB.9.327 mAC.11.570 mAD.13.830 mA
15. As a capacitor is being charged, current flowing into the capacitor will:A.increaseB.decreaseC.remain the sameD.cannot tell
16. What is the phase shift between the voltage across the resistor and the voltage from the source?
A.VR leads VS by 17°B.VR leads VS by 73°C.VR lags VS by 73°
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
D.VR lags VS by 17°
17. A capacitor stores energy within a dielectric between the conducting plates in the form of:A.a magnetic fieldB.positive voltageC.negative voltageD.an electric field
18. As a capacitor is being charged, the voltage across its terminals will:A.increaseB.decreaseC.remain the sameD.oppose the source
19. With a 500 kHz signal source, what would be the value of a capacitor yielding a capacitive reactance of 1 k ?A.318 pFB.2 nFC.3.18 FD.2 F
20. After a capacitor has charged for 1 tc, what percentage of current remains in the resistor?A.63.2 B.36.8C.13.5 D.5.0
21. If a current of 40 mA flows through a series circuit consisting of a 0.4 F capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance?A.10 B.100 C.1 k D.1 M
22.
What is the capacitance of the circuit shown in the given circuit?A.0.066 FB.0.9 FC.65.97 pFD.900 pF
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
23. In an ac circuit, an output capacitor and a resistor are connected in series with an ac signal. What filter action will be the result?A.bandpass B.low-passC.high-pass D.band-stop
24. What is the total opposition to current in a series RC circuit called?A.impedance B.inductanceC.reactance D.resistance
25. Which of the following statements is true?A.The voltage to which a capacitor is charged can change instantaneously.B.The current in a capacitive circuit takes time to change.C.A fully charged capacitor appears as a short to dc current.D.An uncharged capacitor appears as a short to an instantaneous change in current.
26. In a capacitive circuit, current flow is limited toA.charging periodsB.discharging periodsC.neither charging periods nor discharging periodsD.both charging periods and discharging periods
27. What circuit has the following frequency response?
29. Which of the following determines the capacitance of a capacitor?A.Plate area, dielectric strength, and plate separationB.Voltage rating, dielectric constant, and temperature coefficientC.Temperature coefficient, plate area, and plate separationD.Plate area, dielectric constant, and plate separation
30. Most older types of paper capacitors have been replaced by which type of construction?A.electrolyticB.plastic filmC.oxide casingD.waxed paper
31. If C1, a 4.7 F capacitor, and C2, a 3.3 F capacitor are in series with 18 Vdc applied, what is the voltage across C1?A.3.3 VB.7.4 VC.6.6 VD.9.4 V
32. What is the impedance of a series RC circuit that consists of a 0.22 F capacitor and a 200-ohm resistor connected to a 3 kHz source?A.214 ohmsB.313 ohmsC.414 ohmsD.880 ohms
33. What is the reactance value for a capacitor installed in a dc circuit?A.zeroB.moderateC.infiniteD.cannot tell
34. In a purely capacitive circuit,A.current leads voltage by 90°B.voltage leads current by 90°C.current lags voltage by 90°D.current and voltage have a phase relationship of 0°
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IMPORTANT INTERVIEW QUESTIONS FOR ECE
35.
How long would it take the capacitor in the given circuit to completely discharge if the switch was in position 2?A.22 msB.69 msC.345 msD.420 ms
