MCQ in Electrical Circuit Part 7 | ECE Board Exam

(Last Updated On: August 3, 2018)

This is the Multiples Choice Questions Part 7 of the Series in Electrical Circuit as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in AC-DC circuits
• MCQ in Resistors
• MCQ in Inductors
• MCQ in Capacitors

Continue Practice Exam Test Questions Part 7 of the Series

Choose the letter of the best answer in each questions.

301. The total resistance of a two similar wire conductors connected in parallel is ________.

A. resistance of one wire multiplied by 4

B. same resistance of one wire

C. one half the resistance of one wire

D. double the resistance of one wire

302. What is the value of a resistor with colors from left: Orange, Blue, Gold, and Silver?

A. 34 ohms ± 10%

B. 3.6 ohms ± 10%

C. 3.4 ohms ± 10%

D. 36 ohms ± 10%

303. Determine the value of a resistor with colors from left to right; Brown, Green, Gold, and Silver.

A. 1.5 ohms ± 10%

B. 15 ohms ± 10%

C. 1.5 ohms ± 20%

D. 15 ohms ± 20%

304. Resistors with high value usually have lower wattage ratings because of _________.

A. varying current

B. lower current

C. bigger size

D. high current

305. Smaller resistors usually have ________ resistance value.

A. small

B. high

C. low

D. very small

306. When resistors are connected in series, what happens?

A. The effective resistance is decreased

B. Nothing

C. The tolerance is decreased

D. The effective resistance is increased

307. A 33 kilo ohms resistor is connected in series with a parallel combination made up of a 56 kilo ohm resistor and a 7.8 kilo ohm resistor. What is the total combined resistance of these three resistors?

A. 63769 ohms

B. 49069 ohms

C. 95800 ohms

D. 39067 ohms

308. If you need a 1.25 kΩ resistance and you only have resistors of 5 kΩ, how many of these available resistors you should connect in parallel to get a 1.25 kΩ value?

A. 2

B. 3

C. 4

D. 5

309. Insulating elements or materials has a capability of

A. allowing electric current to flow

B. supporting charge flow

C. preventing short circuit between conducting wires

D. making electrical circuits to be completed

310. _________ is used to store electrical energy in an electrostatic field?

A. A transformer

B. A battery

C. A capacitor

D. An inductor

311. What factors determine the capacitance of a capacitor?

A. Area of the plates, amount of charge on the plates and the dielectric constant of the material between the plates

B. Area of the plates, voltage on the plates and the distance between the plates

C. Area of the plates, distance between the plates, and the dielectric constant of the material between the plates

D. Area of the plates, voltage on the plates and dielectric constant of the material between the plates

312. Factors that determine the capacitance of a capacitor.

A. area of the plate; directly proportional

B. distance between plate; inversely proportional

C. dielectric constant; directly proportional

D. all of these

313. An electronic/electrical component/device used to store electrical energy.

A. Capacitor

B. Inductor

C. Resistor

D. lightning arrester

314. Which of the following describes the action of a capacitor?

A. Converts ac into dc

B. Stores electrical energy

C. Opposes change in current flow

D. Creates a dc resistance

315. A parallel plate capacitor has the following values: k = 81; d = 0.025 inches; A = 6 square inches. What is the capacitance of the capacitor?

A. 4.372 picofarad

B. 43.72 picofarad

C. 4372 picofarad

D. 437.2 picofarad

316. Five picofarad is equivalent to ________.

A. 5 x 10 to the -12th

B. 50 x 10 to the -12th

C. 5 x 10 to the -10th

D. 500 x 10 to the -10th

317. If two micro-farad capacitors are connected in series, what will be the total effective capacitance?

A. 0.125 microfarad

B. 0.0624 microfarad

C. 2.5 microfarad

D. 0.50 microfarad

318. A 20 μF capacitor is charged by a 12-V battery. What is the stored energy at the capacitor?

A. 2.88 x 10^-3 J

B. 1.07 x 10^-3 J

C. 1.44 x 10^-3 J

D. 2.88 x 10^-2 J

319. Which of the following characterizes inductance?

A. Tends to oppose dc

B. Tends to oppose changes in voltage

C. Tends to oppose changes in current

D. Opposes all frequencies equally

320. A coil of wire wound, with or without a magnetic core designed to have a higher self-inductance than a straight wire.

A. Inductor

B. Solenoid

C. Toroid

D. Inductive relay

321. With the same voltage applied, which of the following allows more current?

A. 25 ohms

B. 250 ohms

C. 0.25 ohms

D. 2.5 ohms

322. In electrical circuits, current is known as the flow of charged carriers, such as electrons. When can this happen?

A. when an electrical force (called emf) is applied

B. when material used allows electrons to flow

C. when there is circuit continuity

D. all of the above

323. What utilizes electrical energy in electrical circuits?

A. supply emf

B. load

C. the conducting wires

D. all of the above

324. An electronic device draws 300 watts from its 24-volt power source. Find effective resistance.

A. 1.92 ohms

B. 19.20 ohms

C. 1.25 ohms

D. 12.50 ohms

325. A 50 Ω resistor is connected in series with a 150C resistor and to a supply voltage of 20 V. What is the current through the 50 Ω resistor?

A. 0.01 A

B. 0.1 A

C. 1.0 A

D. 10 A

326. Two resistors, 10 Ω and 100 Ω are connected in parallel, approximately, what is the total resistance?

A. 10 Ω

B. 50 Ω

C. 90 Ω

D. 100 Ω

327. A shunt resistor is used to limit the load current to 0.5 A, if the load resistance is 100 Ω and the original current is 1amp, what should be the value of the shunt resistance?

A. 25 Ω

B. 50 Ω

C. 75 Ω

D. 100 Ω

328. How many 1 kΩ resistors to be connected in parallel are needed in order to get 100 Ω?

A. 2

B. 5

C. 10

D. 20

329. Two resistors, R1 = 100 Ω and R2 = 200 Ω are connected in series, if the voltage across R2 is 20 V, what is the voltage across R1?

A. 5 V

B. 10 V

C. 15 V

D. 20 V

330. Two resistors, R1 = 100 Ω and R2 = 200 Ω are connected in parallel. If the current through R1 is 1 A, what would be the current on R2?

A. 0.125 A

B. 0.25 A

C. 0.35 A

D. 0.50 A

331. A 6A current source drives a load consisting a parallel combination of R1 = 50 Ω and R2 = 25 Ω. Determine the current I1 through R1.

A. 1 amp

B. 2 amps

C. 3 amps

D. 4 amps

332. A constant voltage source Vs = 60 is delivering a power to a series combination of R1 = 100 Ω, R2 = 200 Ω and R3 = 300 Ω. Calculate the voltage drop across R2.

A. 10 V

B. 20 V

C. 30 V

D. 40 V

333. If 12 V are applied to a circuit that consumes 78 W, what is the current flow through the circuit?

A. 6.5 A

B. 936 A

C. 0.15 A

D. 9.36 A

334. Find the current that flows through the filament of a 400 watts flat iron connected to a 220 Volt power line.

A. 50 mA

B. 5 A

C. 5 mA

D. 500 mA

335. An electrical device has a resistance of 10 Ω and is supplied with a 5 ampere constant current source. If the deice is rated 100 Vdc, determine its power consumed.

A. 250 W

B. 450 W

C. 750 W

D. 1000 W

336. The power dissipated by a 10 Ω load resistor with a current rating of 5 amperes is _________ if supplied with a 20 volt dc potential.

A. 40 W

B. 80 W

C. 160W

D. 250 W

337. The power in a circuit consisting of two equal resistors in series is known to be 10 watts. If the two resistors are connected in parallel, what would be the circuit power dissipation?

A. 2.5 watts

B. 5 watts

C. 20 watts

D. 40 watts

338. How many nodes are needed to completely analyze a circuit according to Kirchhoff’s current law?

A. two

B. all nodes in the circuit

C. one less than the total number of nodes in the circuit

D. one

339. Loop currents should be assumed to flow in which direction?

A. Straight

B. Either C or D arbitrarily selected

C. Counter-clockwise

D. Clockwise

340. What theorem we should use in solving electrical circuits with several voltage sources?

A. superposition

B. Norton

C. Thevenin

D. Kirchhoff

341. In a mesh, the algebraic sum of all voltages and voltage drops is equal to zero.

A. superposition theorem

B. Norton’s law

C. Kirchhoff’s first law

D. Kirchhoff’s second law

342. The sum of all currents entering a junction is equal to the sum of currents leaving away from that junction.

A. Kirchhoff’s first law

B. Kirchhoff’s second law

C. Norton’s theorem

D. Thevenin’s theorem

343. Theorem used to simplify complex circuits wherein, the simplified circuit contains an equivalent open circuit resistance and open circuit voltage.

A. Norton’s

B. Thevenin’s

C. Maxwell’s

D. Kirchhoff’s

344. Considered as the reverse of Thevenin’s theorem.

A. Maxwell

B. Superposition

C. Kirchhoff

D. Norton’s

345. A certain Thevenin equivalent circuit has parameters RTH = 10 Ω and VTH = 20 V. If this is converted to Norton’s equivalent circuit, RN and IN would be

A. 10 Ω and 2 A

B. 10 Ω and 4 A

C. 0.10 and 2 A

D. 0.10 and 4 A

346. RN and IN of a Norton’s equivalent circuit are known to be 100Ω and 10A, respectively. If

a 400Ω load is connected, it will have a load current of

A. 1 A

B. 2 A

C. 3 A

D. 4 A

347. A chosen closed path of current flow in a network. In making this current path there should be no node nor elements that are passed more than once.

A. node

B. junction

C. mesh

D. loop

348. A set of circuit elements that forms a closed path in a network over which signal can circulate.

A. node

B. junction

C. mesh

D. loop

349. In a network, what do we call a reference point chosen such that more branches in a circuit met.

A. node

B. junction

C. ground

D. mesh

350. A common connection between circuit elements or conductors from different branches.

A. node

B. junction

C. ground

D. mesh

Questions and Answers in Electrical Circuit

Following is the list of practice exam test questions in this brand new series:

Complete List of MCQ in Electronics Engineering per topic