This is the Multiples Choice Questions Part 6 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.

### Online Questions and Answers Topic Outline

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

### Continue Practice Exam Test Questions Part 6 of the Series

**Choose the letter of the best answer in each questions.**

251. A neon glow lamp used as a night light ionizes at approximately.

A. 70 V

B. 80 V

C. 90 V

D. 100 V

Answer: **Option A**

Solution:

252. What dielectric is generally employed by a variable capacitor?

A. Mica

B. Air

C. Electrolyte

D. Ceramic

Answer: **Option B**

Solution:

A. LOCAP switch

B. AntiLOCAP switch

C. Anticapacitance switch

D. Capacitance switch

Answer: **Option C**

Solution:

A. Bifilar resistor

B. Wire-wound resistor

C. Anti-inductive resistor

D. Bleeder resistor

Answer: **Option A**

Solution:

A. Mixture

B. Compound

C. Alloy

D. Ionization

Answer: **Option C**

Solution:

A. Peak

B. Average

C. Rms

D. Instantaneous

Answer: **Option A**

Solution:

A. Increases two times

B. Increases four times

C. Decreases two times

D. Decreases four times

Answer: **Option A**

Solution:

A. Decreases

B. Increases

C. Decreases or increases

D. Decreases, increases or remains the same

Answer: **Option C**

Solution:

A. Halfway between maximum and minimum

B. Maximum

C. Minimum

D. Zero

Answer: **Option B**

Solution:

260. In a circuit, a passive element is one which

A. Supplies energy

B. Receives energy

C. Both supplies and receives energy

D. Attenuates signal

Answer: **Option B**

Solution:

261. Rationalizing the denominator of a complex number means

A. Eliminating the j component in the denominator

B. Adding j component in the denominator

C. Eliminating the j component in the numerator

D. Adding j component in the numerator

Answer: **Option A**

Solution:

262. When two complex conjugates are subtracted, the result is a

A. Quadrature component only

B. Complex component

C. In-phase component

D. Real component

Answer: **Option A**

Solution:

A. 0

B. I^2XL

C. IXL

D. IXL2

Answer: **Option A**

Solution:

A. 2.5

B. 5

C. 10

D. 25

Answer: **Option B**

Solution:

A. 10

B. 5

C. 50

D. 100

Answer: **Option A**

Solution:

A. Increased

B. Decreased

C. Constant

D. Zero

Answer: **Option A**

Solution:

A. Number of plates

B. Dielectric

C. Distance between plates

D. Plate area

Answer: **Option C**

Solution:

A. Greater electrical power saving

B. Power loss is minimum

C. Appliances have different current ratings

D. All of the above

Answer: **Option C**

Solution:

A. V(m)^2

B. V(m)

C. V/m^2

D. V/m

Answer: **Option D**

Solution:

270. Which of the following is the peakiest?

A. Square wave

B. Sinusoidal wave

C. Triangular wave

D. Rectangular wave

Answer: **Option C**

Solution:

A. Because it is a simple circuit

B. Because dc circuits require only resistance as load

C. Because they do not exist in a dc circuit

D. Because frequency of dc is zero

Answer: **Option D**

Solution:

A. Greater than the largest capacitor

B. Smaller than the largest capacitor

C. Smaller than the smallest capacitor

D. Greater than the smallest capacitor

Answer: **Option A**

Solution:

A. Resistance

B. Reactance

C. Inductance

D. Capacitance

Answer: **Option B**

Solution:

A. Current

B. Voltage

C. Both current and voltage

D. Neither current nor voltage

Answer: **Option B**

Solution:

A. 2L and 1/2 A

B. Does not matter because the volume of copper remains the same

C. L and A

D. ½ L and 2 A

Answer: **Option D**

Solution:

A. Quality factor

B. Power factor

C. Power ratio

D. Reactive power

Answer: **Option D**

Solution:

A. 50 %

B. 100 %

C. 25 %

D. 75 %

Answer: **Option A**

Solution:

A. Linear law

B. Hyperbolic law

C. Inverse-square law

D. Exponential law

Answer: **Option D**

Solution:

279. Norton’s theorem is what form of an ac equivalent circuit?

A. Voltage

B. Current

C. Both voltage and current

D. Neither voltage nor current

Answer: **Option B**

Solution:

A. 200 μF

B. 2 μF

C. 100 μF

D. 0.5 μF

Answer: **Option B**

Solution:

281. An inductive load always has a ___________ power factor

A. Leading

B. Lagging

C. Zero

D. Unity

Answer: **Option B**

Solution:

A. Less than the smallest resistance in the connection

B. Greater than the smallest resistance in the connection

C. Between the smallest and greatest resistance in the connection

D. Increasing and decreasing depending upon the supply voltage

Answer: **Option A**

Solution:

A. Large self-induced voltage across L

B. Long time constant

C. Low resistance of the open switch

D. Surge of resistance

Answer: **Option A**

Solution:

A. Polar diagram

B. Scalar quantity

C. Velocity

D. Phasor

Answer: **Option D**

Solution:

285. Which factor does not affect resistance?

A. Length

B. Resistivity

C. Cross-sectional area

D. Mass

Answer: **Option D**

Solution:

286. Which of the following capacitors are used only in dc circuits?

A. Mica

B. Ceramic

C. Mylar

D. Electrolytic

Answer: **Option D**

Solution:

287. The maximum power transfer theorem is used in

A. Power system

B. Electronic system

C. Refrigeration

D. Air conditioning

Answer: **Option B**

Solution:

288. In Norton’s theorem, the short circuit current is obtained by

A. Opening the load terminals

B. Shorting the load terminals

C. Opening the voltage source

D. Shorting the voltage source

Answer: **Option B**

Solution:

A. RL = 2 r

B. RL = 1.5 r

C. RL = r

D. RL = 3 r

Answer: **Option C**

Solution:

A. 220 V

B. 150 V

C. 110 V

D. 22 V

Answer: **Option C**

Solution:

A. Smaller than the smallest capacitor

B. Smaller than the largest capacitor

C. Greater than any of the capacitor

D. Greater than the largest capacitor

Answer: **Option A**

Solution:

A. Superposition theorem

B. Millman’s theorem

C. Thevenin’s theorem

D. Norton’s theorem

Answer: **Option C**

Solution:

A. Figure of merit

B. Figure of demerit

C. Noise factor

D. Noise figure

Answer: **Option A**

Solution:

A. CV^2/2

B. 2Q^2/C

C. C^2/V

D. CV

Answer: **Option A**

Solution:

A. Superposition theorem

B. Millman’s theorem

C. Thevenin’s theorem

D. Norton’s theorem

Answer: **Option D**

Solution:

296. Which of the following capacitors has the highest cost per μF?

A. Plastic

B. Air

C. Mica

D. Electrolytic

Answer: **Option D**

Solution:

A. 60 W

B. 30 W

C. 15 W

D. 4 W

Answer: **Option B**

Solution:

A. Ohm’s law

B. Coulomb’s law

C. Kirchhoff’s first law

D. Kirchhoff’s second law

Answer: **Option A**

Solution:

299. Another term for superconductor.

A. Generic conductor

B. Ultraconductor

C. Cryotron

D. Cryogenic conductor

Answer: **Option D**

Solution:

300. A circuit whose parameters change with voltage or current.

A. Non-linear circuit

B. Linear circuit

C. Complex circuit

D. Passive circuit

Answer: **Option A**

Solution:

### Questions and Answers in Electrical Circuit

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

**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**

**MCQ in Electrical Circuit Series**