 # MCQ in Electrical Circuit Part 1 | ECE Board Exam

(Last Updated On: May 3, 2019)

This is the Multiples Choice Questions Part 1 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

### Start with Part 1 of the Practice Exam Test Questions Series

Choose the letter of the best answer in each questions.

1. Conventional flow assumes charges flow from

A. Positive to negative

B. Positive to positive

C. Negative to positive

D. Negative to negative

Solution:

2. Electron flow assumes charges flow from

A. Negative to positive

B. Negative to negative

C. Positive to negative

D. Positive to positive

Solution:

3. Series resonance occurs when

A. XL = XC

B. XL = R

C. Z = R

D. Both A and C

Solution:

4. The symbol Q refers to

A. Resonance quotient

B. Quality factor

C. Power quotient

D. Qualification test

Solution:

5. The ratio of W/VA in an ac circuit means

A. Power factor

B. Reactive factor

C. Quality factor

Solution:

6. What is the reciprocal of quality factor?

A. Power factor

B. Reactive factor

C. Dissipation factor

D. 1/Q factor

Solution:

7. In liquids and gases, ionization current results from a flow of

A. Positive or negative ions

B. Free electrons

C. Ions that are lighter in weight than electrons

D. Protons

Solution:

8. VL = VC in a series RLC circuit when

A. The value of the impedance is minimum

B. The power factor is zero

C. The current leads the total voltage by 90˚

D. The total voltage is zero

Solution:

9. At what frequency will an inductor of 5mH have the same reactance as a capacitor of 0.1 μF?

A. 7.12 kHz

B. 7.12 Hz

C. 7.12 MHz

D. 7.12 GHz

Solution:

10. Property of an electric circuit that dissipates electric energy

A. Reactance

B. Impedance

C. Resistance

D. Conductance

Solution:

11. What is the other name of relative permittivity?

A. Dielectric strength

C. Breakdown voltage

D. Specific inductance capacity

Solution:

12. In a series RLC circuit

A. The current lags VL by 90˚

B. The current leads VL by 90˚

C. XL leads Xc by 90˚

D. Z = jXL at resonance

Solution:

13. Resistor with colored bands in the body

A. Wire-wound resistor

B. Carbon-composition resistor

C. Potentiometer

D. Rheostat

Solution:

14. In a resonant circuit, if Q ≥ 10 resonant frequency __________ bandwidth.

A. Bisects

B. Exceeds

C. Is less than

D. Is equal to

Solution:

15. Which of the following conditions is not true for a series RLC circuit at resonance?

A. Z = jXL

B. XL = XC

C. The power factor is one

D. The magnitude of Z is

Solution:

16. The current is ____________ times the maximum current at half-power points of a resonance curve.

A. 0.707

B. 1.414

C. 0.5

D. 0.632

Solution:

17. A gang capacitor is a variable capacitor in which capacitance is varied by changing the

A. Dielectric

B. Number of plates

C. Plate area

D. Distance between plates

Solution:

18. In an ac circuit with inductive reactance, the

A. Phase angle of the circuit is always 45˚

B. Voltage across the inductance must be 90˚ out-of-phase with the applied voltage

C. Current through the inductance lags its induced voltage by 90˚

D. Current through the inductance and voltage across it are180˚ out-of-phase

Solution:

19. If three 9 mH inductors are connected in parallel without mutual inductance then the total inductance is

A. 3 mH

B. 9 mH

C. 27 mH

D. 18 mH

Solution:

20. What is the specific resistance of a pure germanium?

A. 55 Ω-cm

B. 55 Ω-m

C. 55 Ω-mm

D. 55 kΩ-m

Solution:

21. Two capacitors of capacitance 9 μF and 18 μF in series will have a total capacitance of

A. 27 μF

B. 162 μF

C. 6 μF

D. 180 μF

Solution:

22. In a series RLC circuit

A. Increasing the frequency decreases the resistance

B. Increasing the frequency increases the resistance

C. Both XL and XC change as frequency changes

D. Impedance will always decrease

Solution:

23. A series RLC circuit has a __________ power factor at its half-power points

A. Unity

C. Lagging

D. Either B or C

Solution:

24. Kirchhoff’s laws (KCL and KVL) are applicable to

A. DC circuits

B. AC circuits

C. DC as well as AC circuits

D. Passive networks alone

Solution:

25. A tank circuit is a

A. Parallel LC circuit

B. Series LC circuit

C. A resonant circuit

D. A non-resonant circuit

Solution:

26. A capacitive load always has a ________ power facto

B. Lagging

C. Zero

D. Unity

Solution:

27. What is the temperature coefficient of the resistance Eureka?

A. Infinity

B. Negative

C. Almost zero

D. Positive

Solution:

28. As applied to a series RLC circuit, bandwidth means

A. The frequency range for maximum power transfer

B. The difference between the highest and lowest frequencies of the oscillator

C. The separation of the half-power points

D. The frequency at which XL = XC

Solution:

29. Which is considered as the effect of a dielectric material?

A. Increasing capacitance

B. Decreasing capacitance

C. Reducing the working voltage

D. Increasing the distance between the plates

Solution:

30. The open-circuit voltage at the terminal of load RL is 60V. Under the condition of maximum power transfer, the load voltage will be

A. 60 V

B. 15 V

C. 20 V

D. 30 V

Solution:

31. If a capacitor is rated for 200V dc, what is its effective ac working voltage?

A. 50 V

B. 100 V

C. 200 V

D. 400 V

Solution:

32. If resonant frequency is 10 kHz and quality factor is 50, then

A. Bandwidth is 200 Hz

B. XL = is 50,000 Ω

C. R is 50 Ω

D. XC = is 50,000 Ω

Solution:

33. Which statement is true?

A. A series resonant circuit is of high impedance

B. A parallel resonant circuit is of low impedance

C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

Solution:

34. What is considered as the most important value of a sine wave?

A. Effective value

B. Peak value

C. Average value

D. Instantaneous value

Solution:

35. An ac series circuit is composed of a resistance of 20 Ω, inductive reactance of 40 Ω, and a capacitive reactance of 15 Ω. If a current of 1 ampere is flowing, what is the applied voltage

A. 320 V

B. 32 V

C. 220 V

D. 22 V

Solution:

36. An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil

B. Transient ac current

C. Inductive current

D. Capacitive current

Solution:

37. The value of temperature coefficient (α) is dependent upon

A. The nature of material and temperature

B. The length of material

C. The cross-sectional area of the material

D. The volume of the material

Solution:

38. At what frequency will the current in a series RLC circuit reach its maximum value for an applied voltage of 15 V with R = 500 Ω, L = 100 μH and C = 0.001 μF?

A. 503 kHz

B. 403 kHz

C. 603 kHz

D. 303 kHz

Solution:

39. If two equal resistances connected in series across a certain supply are now connected in parallel across the same supply, the power produced will be _________ that of series connection

A. One-half

B. One-fourth

C. Two times

D. Four times

Solution:

40. The voltage lags the current by cycle in a

A. Purely resistive circuit

B. Purely inductive circuit

C. Purely capacitive circuit

D. Circuit containing resistance, capacitance and inductance

Solution:

41. What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?

A. 1.65 kHz

B. 16.5 MHz

C. 16.5 kHz

D. 165 kHz

Solution:

42. Which one of the following elements serves as a protection against overload?

A. Fuse

B. Switch

C. Resistor

D. Relay

Solution:

43. Transient period is considered over after

A. 5

B. 1

C. 100

D. 6

Solution:

44. What rating of a resistor determines its ability to absorb heat?

A. Wattage

B. Ohmic

C. Current

D. Voltage

Solution:

45. An open inductor has

A. Zero resistance and infinite inductance

B. Infinite resistance and zero inductance

C. Infinite resistance and infinite inductance

D. Zero resistance and zero inductance

Solution:

46. What is the reading of an ohmmeter for a shorted capacitor?

A. Zero

B. Infinity

C. kΩ

D. MΩ

Solution:

47. What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?

A. Surge

B. Stray

C. Natural

D. Normal

Solution:

48. The average value of a triangular or sawtooth wave is __________ times its peak value.

A. 0.577

B. 0.500

C. 0.318

D. 0.637

Solution:

49. A series RLC circuit consists of a 10 Ω resistor in series with L = 10 μH, and C = 100 μF. Determine a new value of I, for which the resonant frequency is one –half the original value.

A. 40 μH

B. 40 mH

C. 40 pH

D. 40 nH

Solution:

50. What is the peak factor of a triangular wave?

A. 1.16

B. 1.73

C. 1.41

D. 1.11

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
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART 3
PART 4: MCQs from Number 151 – 200                 Answer key: PART 4
PART 5: MCQs from Number 201 – 250                 Answer key: PART 5
PART 6: MCQs from Number 251 – 300                 Answer key: PART 6
PART 7: MCQs from Number 301 – 350                 Answer key: included
PART 8: MCQs from Number 351 – 400                 Answer key: included
PART 9: MCQs from Number 401 – 450                 Answer key: included
PART 10: MCQs from Number 451 – 500                 Answer key: included

### Complete List of MCQ in Electronics Engineering per topic

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