Multiple Choice Questions Topic Outline
- MCQs in AC-DC circuits
- MCQs in Resistors
- MCQs in Inductors
- MCQs in Capacitors
The Six-Parts Series
Following is the list of multiple choice questions in this brand new series:
Start with Part V of the MCQs 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
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
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
204. How many degrees of phase represents one full cycle?
- A. 360
- B. 180
- C. 270
- D. 90
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
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
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
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
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
210. What does a capacitor store?
- A. Voltage
- B. Charge
- C. Current
- D. Power
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
212. The result of rust in electrical (wire) connection is
- A. Inductance
- B. Conductance
- C. Impedance
- D. Resistance
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
214. The resistance of an insulator ___ when its temperature is increased.
- A. Decreases
- B. Remains the same
- C. Increases
- D. Varies
215. The wavelength of an alternating waveform depends upon the ___ of the variation.
- A. Period
- B. Number
- C. Frequency
- D. Amplitude
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
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
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
219. What increases the resistance of wire at high frequencies?
- A. Temperature
- B. Voltage
- C. Skin effect
- D. Insulation
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
221. Barium-strontium titanite dielectric material is also called
- A. Ceramic
- B. Polyster
- C. Electrolytic
- D. Bakelite
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
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
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
225. For a linear circuit, ___ voltage or current is used to calculate average power.
- A. Rms
- B. Peak
- C. Average
- D. Instantaneous
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
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
228. In a complex number 5 + j 10, 10 is called ___ part.
- A. Imaginary
- B. Real
- C. Conjugate
- D. Integer
229. The presence of an electric current is made known by
- A. Electric shock
- B. Effects produced
- C. Magnetic shock
- D. Flashing
230. The reciprocal of a complex number is
- A. A complex number
- B. A real number
- C. An imaginary number
- D. A whole number
231. Which of the following has negative temperature coefficient?
- A. Carbon
- B. Nickel
- C. Brass
- D. Constantan
232. Which of the following is a common material used in wire-wound resistors?
- A. Manganin
- B. Carbon
- C. Bronze
- D. German silver wire
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
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
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
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
237. An impedance given by 90 -45˚ is a/an ___ impedance.
- A. Inductive
- B. Conductive
- C. Resistive
- D. Capacitive
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
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
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
241. In a multiple capacitor, the plate area is
- A. Increased
- B. The same
- C. Decreased
- D. Variable
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
243. In an ac circuit, the power dissipated as heat depends on
- A. Impedance
- B. Capacitive reactance
- C. Resistance
- D. Inductive reactance
244. Which of the following dielectric materials makes the lowest-capacitance capacitor?
- A. Paper
- B. Mica
- C. Air
- D. Electrolyte
245. In adding or subtracting phasor quantities, ___ form is the most convenient.
- A. Polar
- B. Rectangular
- C. Trigonometric
- D. Exponential
246. In dividing or multiplying phasor quantities, ___ form is used.
- A. Polar
- B. Rectangular
- C. Trigonometric
- D. Exponential
247. The power factor of a circuit is equal to
- A. RZ
- B. XC/Z
- C. XL/Z
- D. R/Z
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
249. If a multiplate capacitor has 10 plates, each of area 10 cm2, 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
250. Of the equivalent combination of units, which one is not equal to watt?
- A. Ω2/V
- B. AV
- C. A2Ω
- D. J/s
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