This is the Multiples Choice Questions Part 5 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.

### Multiple Choice Questions Topic Outline

- MCQs in AC-DC circuits
- MCQs in Resistors
- MCQs in Inductors
- MCQs in Capacitors

### Continue Practice Exam Test Questions Part 5 of the Series

201. The distance between the capacitor plates increases two times, then its capacitance

- A. Increases two times
- B. Increases four times
- C. Decreases two times
- D. Decreases four times

Answer: **Option C**

Solution:

202. The ratio between the active power and the apparent power of a load in an ac circuit is called

- A. Quality factor
- B. Power factor
- C. Power ratio
- D. Power reactive

Answer: **Option B**

Solution:

203. When the power factor of a circuit is zero,

- A. Power absorbed is maximum
- B. Power absorbed is minimum
- C. Power absorbed is zero
- D. The impedance is minimum

Answer: **Option C**

Solution:

204. How many degrees of phase represents one full cycle?

- A. 360
- B. 180
- C. 270
- D. 90

Answer: **Option C**

Solution:

205. Which of the following does not generally affect the value of a capacitor?

- A. The dielectric material used
- B. The surface area of the plates
- C. The thickness of the dielectric
- D. The voltage applied to the plate

Answer: **Option D**

Solution:

206. What is the purpose of a load in an electric circuit?

- A. To increase the circuit current
- B. To decrease the circuit current
- C. To utilize electrical energy
- D. To make the circuit complete

Answer: **Option C**

Solution:

207. The power factor of a certain circuit in which the voltage lags behind the current is 80%. To increase the power to 100%, it is necessary to add ________ to the circuit.

- A. Inductance
- B. Capacitance
- C. Resistance
- D. Impedance

Answer: **Option A**

Solution:

208. Refers to the outward-curving distortion of the lines of force near the edges of two parallel metal plates that form a capacitor.

- A. Skin effect
- B. Night effect
- C. Edge effect
- D. Hall effect

Answer: **Option C**

Solution:

209. If voltage across the plates of 2 F capacitor is increased by 4 V, then charge on the plates will

- A. Decrease by 2 C
- B. Increase by 2 C
- C. Decrease by 4 C
- D. Increase by 4 C

Answer: **Option D**

Solution:

210. What does a capacitor store?

- A. Voltage
- B. Charge
- C. Current
- D. Power

Answer: **Option B**

Solution:

211. The mutual inductance between two coils is ________ the reluctance of magnetic path.

- A. Directly proportional to
- B. Inversely proportional to
- C. Independent to
- D. Equal to

Answer: **Option B**

Solution:

212. The result of rust in electrical (wire) connection is

- A. Inductance
- B. Conductance
- C. Impedance
- D. Resistance

Answer: **Option D**

Solution:

213. Which of the following is a disadvantage of a wire-wound resistor?

- A. It has reactance in radio-frequency circuits
- B. It cannot handle much power
- C. It draws a large amount of current
- D. It cannot handle high voltage

Answer: **Option A**

Solution:

214. The resistance of an insulator ________ when its temperature is increased.

- A. Decreases
- B. Remains the same
- C. Increases
- D. Varies

Answer: **Option A**

Solution:

215. The wavelength of an alternating waveform depends upon the ________ of the variation.

- A. Period
- B. Number
- C. Frequency
- D. Amplitude

Answer: **Option C**

Solution:

216. Delta to wye or wye to delta transformation technique is applied to a _________ network.

- A. One-terminal
- B. Two-terminal
- C. Three-terminal
- D. Complex

Answer: **Option C**

Solution:

217. For greater accuracy, the value of phase angle θ should be determined from

- A. Cos θ
- B. Tan θ
- C. Sin θ
- D. Sec θ

Answer: **Option B**

Solution:

218. Inductive reactance applies only to sine waves because it

- A. Increases with lower frequencies
- B. Increases with lower inductance
- C. Depends on the factor 2 π
- D. Decreases with higher frequencies

Answer: **Option C**

Solution:

219. What increases the resistance of wire at high frequencies?

- A. Temperature
- B. Voltage
- C. Skin effect
- D. Insulation

Answer: **Option C**

Solution:

220. An inductor carries 2 A dc. If its inductance is 100 μH, then what is its inductive reactance?

- A. Zero
- B. 1.3 kΩ
- C. 628 Ω
- D. -628 Ω

Answer: **Option A**

Solution:

221. Barium-strontium titanite dielectric material is also called

- A. Ceramic
- B. Polyster
- C. Electrolytic
- D. Bakelite

Answer: **Option A**

Solution:

222. In the 5-band method of capacitor color coding, the first band indicates

- A. Temperature coefficient
- B. Tolerance
- C. 1st digit
- D. Capacitance value

Answer: **Option A**

Solution:

223. What is the most convenient way of achieving large capacitance?

- A. By using multiplate construction
- B. By using air as dielectric
- C. By decreasing distance between plates
- D. By using dielectric of low permittivity

Answer: **Option A**

Solution:

224. A linear circuit is one whose parameters

- A. Change with change in voltage
- B. Change with change in current
- C. Do not change with voltage and current
- D. Change with change in voltage and current

Answer: **Option C**

Solution:

225. For a linear circuit, ________ voltage or current is used to calculate average power.

- A. Rms
- B. Peak
- C. Average
- D. Instantaneous

Answer: **Option A**

Solution:

226. When two coils of identical reactance are in parallel without mutual inductance, the reactance of the combination is _________ the reactance of each coil.

- A. One half
- B. Twice
- C. Four times
- D. One fourth

Answer: **Option A**

Solution:

227. Which of the following is also known as anti-resonant circuit?

- A. Parallel resonant circuit
- B. Series resonant circuit
- C. Tuned circuit
- D. Tank circuit

Answer: **Option A**

Solution:

228. In a complex number 5 + j 10, 10 is called ________ part.

- A. Imaginary
- B. Real
- C. Conjugate
- D. Integer

Answer: **Option A**

Solution:

229. The presence of an electric current is made known by

- A. Electric shock
- B. Effects produced
- C. Magnetic shock
- D. Flashing

Answer: **Option B**

Solution:

230. The reciprocal of a complex number is

- A. A complex number
- B. A real number
- C. An imaginary number
- D. A whole number

Answer: **Option A**

Solution:

231. Which of the following has negative temperature coefficient?

- A. Carbon
- B. Nickel
- C. Brass
- D. Constantan

Answer: **Option A**

Solution:

232. Which of the following is a common material used in wire-wound resistors?

- A. Manganin
- B. Carbon
- C. Bronze
- D. German silver wire

Answer: **Option A**

Solution:

233. If one resistance in a series connection is open, then

- A. The current is zero in all the other resistances
- B. The current is maximum in all the other resistances
- C. The voltage is zero across the open resistance
- D. The voltage is infinite across the open resistance

Answer: **Option A**

Solution:

234. What determines the magnitude of electric current?

- A. The rate at which electrons are produced
- B. The type of material used
- C. The current carrying capacity of the circuit
- D. The rate at which electrons pass a given point

Answer: **Option D**

Solution:

235. For a carbon composition resistor, typical resistance values range from

- A. 2.7 Ω to 22 MΩ
- B. 1000 Ω to 10000 Ω
- C. 10 Ω to 10 MΩ
- D. 2.7 Ω to 2.7 GΩ

Answer: **Option A**

Solution:

236. A lead conductor has a resistance of 25 Ω at 0 ˚C. Determine its resistance at -30 ˚C.

- A. 22 Ω
- B. 24 Ω
- C. 12 Ω
- D. 11 Ω

Answer: **Option A**

Solution:

237. An impedance given by 90∠-45˚ is a/an _________ impedance.

- A. Inductive
- B. Conductive
- C. Resistive
- D. Capacitive

Answer: **Option D**

Solution:

238. If a coil has a Q of 10, it means that

- A. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance
- B. The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil
- C. It is a low Q coil
- D. It is a high Q coil

Answer: **Option A**

Solution:

239. What is the rms value of a square wave?

- A. Equals its peak value
- B. Equals its peak-to-peak value
- C. Peak divided by square root of two
- D. Peak divided by pi

Answer: **Option A**

Solution:

240. The rms value of a triangular or sawtooth waveform is _______ times its peak value.

- A. 0.577
- B. 0.500
- C. 0.25
- D. 0.707

Answer: **Option A**

Solution:

241. In a multiple capacitor, the plate area is

- A. Increased
- B. The same
- C. Decreased
- D. Variable

Answer: **Option A**

Solution:

242. What is the time constant for L of 240 mH in series with R of 20 Ω?

- A. 12 ms
- B. 4.8 s
- C. 83.3 s
- D. 12 s

Answer: **Option A**

Solution:

243. In an ac circuit, the power dissipated as heat depends on

- A. Impedance
- B. Capacitive reactance
- C. Resistance
- D. Inductive reactance

Answer: **Option C**

Solution:

244. Which of the following dielectric materials makes the lowest-capacitance capacitor?

- A. Paper
- B. Mica
- C. Air
- D. Electrolyte

Answer: **Option C**

Solution:

245. In adding or subtracting phasor quantities, _________ form is the most convenient.

- A. Polar
- B. Rectangular
- C. Trigonometric
- D. Exponential

Answer: **Option B**

Solution:

246. In dividing or multiplying phasor quantities, __________ form is used.

- A. Polar
- B. Rectangular
- C. Trigonometric
- D. Exponential

Answer: **Option A**

Solution:

247. The power factor of a circuit is equal to

- A. RZ
- B. XC/Z
- C. XL/Z
- D. R/Z

Answer: **Option D**

Solution:

248. The capacitance of a capacitor is _________ relative permittivity.

- A. Directly proportional to
- B. Inversely proportional to
- C. Equal to
- D. Inversely proportional to the square of

Answer: **Option A**

Solution:

249. If a multiplate capacitor has 10 plates, each of area 10 cm^2, then

- A. 10 capacitors will be in parallel
- B. 10 capacitors will be in series
- C. 9 capacitors will be in parallel
- D. 9 capacitors will be in series

Answer: **Option C**

Solution:

250. Of the equivalent combination of units, which one is not equal to watt?

- A. Ω^2/V
- B. AV
- C. A^2Ω
- D. J/s

Answer: **Option A**

Solution:

### Questions and Answers in Electrical Circuit

**MCQ in Electrical Circuit**

**MCQs from Number 1 – 50**Answer key:

**PART I**

**MCQs from Number 51 – 100**Answer key:

**PART II**

**MCQs from Number 101 – 150**Answer key:

**PART 3**

**MCQs from Number 151 – 200**Answer key:

**PART 4**

**MCQs from Number 201 – 250**Answer key:

**PART 5**

**MCQs from Number 251 – 300**Answer key:

**PART 6**

**MCQs from Number 301 – 350**Answer key:

**included**

**MCQs from Number 351 – 400**Answer key:

**included**

**MCQs from Number 401 – 420**Answer key:

**included**