Gibilisco: MCQ in Power and Resonance in AC circuits | ECE Board Exam

(Last Updated On: March 16, 2020)

Multiple choice questions in Power and Resonance in AC circuits

This is the Multiple Choice Questions (MCQs) in Chapter 17: Power and Resonance in AC circuits from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Start Practice Exam Test Questions

1. The power in a reactance is:

  • A. Radiated power.
  • B. True power.
  • C. Imaginary power.
  • D. Apparent power.

2. Which of the following is not an example of true power?

  • A. Power that heats a resistor.
  • B. Power radiated from an antenna.
  • C. Power in a capacitor.
  • D. Heat loss in a feed line.

3. The apparent power in a circuit is 100 watts, and the imaginary power is 40 watts. The true power is:

  • A. 92 watts.
  • B. 100 watts.
  • C. 140 watts.
  • D. Not determinable from this information.

4. Power factor is equal to:

  • A. Apparent power divided by true power.
  • B. Imaginary power divided by apparent power.
  • C. Imaginary power divided by true power.
  • D. True power divided by apparent power.

5. A circuit has a resistance of 300 W and an inductance of 13.5 μH in series at 10.0 MHz. What is the power factor?

  • A. 0.334.
  • B. 0.999.
  • C. 0.595.
  • D. It can’t be found from the data given.

6. A series circuit has Z = 88.4 Ω with R = 50.0 Ω What is PF?

  • A. 99.9 percent.
  • B. 56.6 percent.
  • C. 60.5 percent.
  • D. 29.5 percent.

7. A series circuit has R = 53.5 Ω and X = 75.5 Ω. What is PF?

  • A. 70.9 percent.
  • B. 81.6 percent.
  • C. 57.8 percent.
  • D. 63.2 percent.

8. Phase angle is equal to:

  • A. Arctan Z/R.
  • B. Arctan R/Z.
  • C. Arctan R/X.
  • D. Arctan X/R.

9. A wattmeter shows 220 watts of VA power in a circuit. There is a resistance of 50 Ω in series with a capacitive reactance of −20 Ω. What is the true power?

  • A. 237 watts.
  • B. 204 watts.
  • C. 88.0 watts.
  • D. 81.6 watts.

10. A wattmeter shows 57 watts of VA power in a circuit. The resistance is known to be 50 Ω, and the true power is known to be 40 watts. What is the absolute-value impedance?

  • A. 50 Ω
  • B. 57 Ω
  • C. 71 Ω
  • D. It can’t be calculated from this data.

11. Which of the following is the most important consideration in a transmission line?

  • A. The characteristic impedance.
  • B. The resistance.
  • C. Minimizing the loss.
  • D. The VA power.

12. Which of the following does not increase the loss in a transmission line?

  • A. Reducing the power output of the source.
  • B. Increasing the degree of mismatch between the line and the load.
  • C. Reducing the diameter of the line conductors.
  • D. Raising the frequency.

13. A problem that standing waves can cause is:

  • A. Feed line overheating.
  • B. Excessive power loss.
  • C. Inaccuracy in power measurement.
  • D. All of the above.

14. A coil and capacitor are in series. The inductance is 88 mH and the capacitance is 1000 pF. What is the resonant frequency?

  • A. 17 kHz.
  • B. 540 Hz.
  • C. 17 MHz.
  • D. 540 kHz.

15. A coil and capacitor are in parallel, with L = 10.0 μH and C = 10 pF. What is fo?

  • A. 15.9 kHz.
  • B. 5.04 MHz.
  • C. 15.9 MHz.
  • D. 50.4 MHz.

16. A series-resonant circuit is to be made for 14.1 MHz. A coil of 13.5 μH is available. What size capacitor is needed?

  • A. 0.945 μF.
  • B. 9.45 pF.
  • C. 94.5 pF.
  • D. 945 pF.

17. A parallel-resonant circuit is to be made for 21.3 MHz. A capacitor of 22.0 pF is available. What size coil is needed?

  • A. 2.54 mH.
  • B. 254 μH.
  • C. 25.4 μH.
  • D. 2.54 μH.

18. A 1/4-wave line section is made for 21.1 MHz, using cable with a velocity factor of 0.800. How many meters long is it?

  • A. 11.1 m.
  • B. 3.55 m.
  • C. 8.87 m.
  • D. 2.84 m.

19. The fourth harmonic of 800 kHz is:

  • A. 200 kHz.
  • B. 400 kHz.
  • C. 3.20 MHz.
  • D. 4.00 MHz.

20. How long is a 1/2-wave dipole for 3.60 MHz?

  • A. 130 feet.
  • B. 1680 feet.
  • C. 39.7 feet.
  • D. 515 feet.

Complete List of Multiple Choice Questions from this Book

Check your work.

Print Friendly, PDF & Email
Please do Subscribe on YouTube!

P inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.

“Will you subscribe today via YOUTUBE?”


Add Comment

PinoyBIX Engineering. © 2014-2020 All Rights Reserved | How to Donate? | Follow me on Blogarama Protection Status

Math Solution

Advanced Math problem age work mixture digit motion Analytic Geometry 01 problem Analytic Geometry 02 problem clock variation progression misc Combination problem Differential Calculus 01 Problem Differential Calculus 02 Problem Differential Equations Problem Fundamentals in Algebra Fundamentals in Algebra Problem Integral Calculus problem Permutation problem Plane Geometry problem Plane Trigonometry problem Probability problem quadratic equation binomial theorem logarithms Solid Geometry problem Spherical Trigonometry problem System of Numbers Problem Venn Diagram Problem

Questions and Answers in Mathematics

Advanced Math Age Work Mixture Digit Motion Algebra and General Mathematics Analytic Geometry 01 Analytic Geometry 02 Calculus Clock Variation Progression Misc Differential Calculus 01 Differential Calculus 02 Differential Equations Engineering Mathematics Geometry Integral Calculus Plane Geometry Plane Trigonometry Probability and Statistics Quadratic Equation Binomial Theorem Logarithms Solid Geometry Spherical Trigonometry System of Numbers Trigonometry


Pre-board in Electronics Engineering

Answers Pre-board in Electronics Engineering - Answers

Questions and Answers

Basic Television - Grob TV Boylestad Questions and Answers Computer Principles Electrical Circuit Electricity and Magnetism Fundamentals Electronic Circuits Floyd Questions and Answers Floyd Self-test Gibilisco Questions and Answers Grob Questions and Answers Industrial Electronics Principles and Applications Malvino Questions and Answers Microelectronics Power Generators / Sources / Principles and Applications Solid State Devices Tests and Measurements Vacuum Tubes

Pre-board in Communications Engineering


Questions and Answers

Acoustics Antennas Blake Questions and Answers Broadcasting and Cable TV System Digital Communication Networks Forouzan Frenzel Self-test Kennedy Questions and Answers Microwave Communications Miscellaneous Questions in Communications Modulation Navigational Aids and Radar Systems Noise Optical Fiber Communications Radiation and Wave Propagation Satellite Communications Transmission Fundamentals Wire and Wireless Communications

GEAS Solution

Dynamics problem Economics problem Physics problem Statics problem Strength problem Thermodynamics problem

Pre-board in GEAS

Questions and Answers in GEAS

Engineering Economics Engineering Laws and Ethics Engineering Management Engineering Materials Engineering Mechanics General Chemistry Giancoli Physics Physics Strength of Materials Thermodynamics
Online Tool: Electrical Charge Conversions
Online Tool: Electrical Charge Conversions
Online Tool: Color Code Conversions
Online Tool: Color Code Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Weight Measurement Conversions
Online Tool: Temperature Measurement Conversions
Online Tool: Temperature Measurement Conversions