Electronics Engineering Mastery Test 12: ECE Pre-Board

(Last Updated On: September 27, 2018)

Electronics Engineering Exam 12

This is 100 items set of Practice Examination 12 in Electronics Engineering composed of previous and/or poterntial Board Exams Questions. Read each questions and choices carefully! Choose the best answer. In the actual board, you have to answer 100 items in Electronics Engineering within 5 hours. You have to get at least 70% to pass the subject. Electronics Engineering is 30% of the total 100% Board Rating along with Mathematics (20%), General Engineering and Applied Sciences (20%) and Electronics Systems and Technology (30%).

Start the Test Yourself Exam 12

Choose the letter of the best answer in each questions.

1. An advantage of an electromagnet over a permanent magnet is that:

  • A. An electromagnet can be switched on and off
  • B. An electromagnet does not have specific polarity
  • C. An electromagnet requires no power source
  • D. Permanent magnets must always be cylindrical
View Answer:

Answer: Option A

Solution:

2. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetized force is called

  • A. Leftover magnetism
  • B. Residual magnetism
  • C. Hysteresis
  • D. Coercivity
View Answer:

Answer: Option B

Solution:

3. Three resistors of 10, 15, and 20 Ω each are connected in parallel. What is the total conductance?

  • A. 0.217 S
  • B. 3.41 S
  • C. 4.62 S
  • D. 0.52 S
View Answer:

Answer: Option A

Solution:

4. What temperature in which the specific resistance of materials is usually measured?

  • A. 290 K
  • B. 300 K
  • C. 20°C
  • D. 0°C
View Answer:

Answer: Option C

Solution:

5. When one resistance in a series string is open, the

  • A. current is maximum in the normal resistances
  • B. current is zero in all of the resistances
  • C. voltage is zero across the open resistance
  • D. current increases in the voltage source
View Answer:

Answer: Option B

Solution:

6. The equivalent wye element of 3 equal resistors each equal to R and connected in delta is

  • A. R
  • B. 3R/2
  • C. R/3
  • D. 3R
View Answer:

Answer: Option C

Solution:

7. A lead storage battery is rated at 12 V. If the internal resistance is 0.01 Ω, what is the maximum power that can be delivered to the load?

  • A. 1,200 W
  • B. 7,200 W
  • C. 3,600 W
  • D. 1,800 W
View Answer:

Answer: Option C

Solution:

8. A simple circuit having a source of 7 nanovolts and a load of 3 kilo-mega ohms has a current equivalent to

  • A. 23.33 amperes
  • B. 2.333 attoamperes
  • C. 2.333 amperes
  • D. 2.333 deca amperes
View Answer:

Answer: Option B

Solution:

9. What happens to the flow of electrons in electronic circuit when the resistance is increased?

  • A. The speed of flow will remain constant
  • B. The flow become faster
  • C. The flow will be decreased
  • D. No flow will occur
View Answer:

Answer: Option C

Solution:

10. A circuit contains an inductor of 10 H in series with the capacitor of 0.001 F and operating at a frequency of 4 MHz. What is the net reactance or X in MΩ?

  • A. 2.4727
  • B. 2472.7
  • C. 247.27
  • D. 24.727
View Answer:

Answer: Option D

Solution:

11. What is the relationship between frequency and the value of R?

  • A. R varies indirectly
  • B. R varies indirectly
  • C. Frequency has no effect
  • D. R varies directly
View Answer:

Answer: Option C

Solution:

12. Longest life cell capable of 20, 000 times charged-discharged cycle and could last 30 years or over

  • A. Nickel-cadmium cell
  • B. Lithium cell
  • C. Nickel hydrogen
  • D. Alkaline cell
View Answer:

Answer: Option C

Solution:

13. It is considered to be a negative charge of electricity?

  • A. Atom
  • B. Electron
  • C. Neutron
  • D. Proton
View Answer:

Answer: Option B

Solution:

14. Refers to a field surrounding electrons and protons at stationary period indicating a stored energy

  • A. Magnetic field
  • B. Electrostatic field
  • C. Electron field
  • D. Electrodynamic field
View Answer:

Answer: Option B

Solution:

15. The time required to complete one complete cycle of a waveform

  • A. Crest
  • B. Wavelength
  • C. Frequency
  • D. Period
View Answer:

Answer: Option D

Solution:

16. Lines of flux generated by one winding which do not link the other winding

  • A. Flux loss
  • B. Leakage flux
  • C. Reactance leakage
  • D. Inductance leakage
View Answer:

Answer: Option B

Solution:

17. What determines whether a substance is an insulator or a conductor?

  • A. Number of protons
  • B. Number of Photons
  • C. Number of valence electrons
  • D. Number of neutrons
View Answer:

Answer: Option C

Solution:

18. Which of the following is positive electricity?

  • A. Resinous dynamic electricity
  • B. Vitreous dynamic electricity
  • C. Vitreous static electricity
  • D. Resinous static electricity
View Answer:

Answer: Option C

Solution:

19. If the magnitude of the potential difference is generated by a single conductor passing through a magnetic field, which of the following statements is FALSE?

  • A. The potential difference depends on the speed with which the conductor cuts the magnetic field
  • B. The potential difference depends on the length of the conductor that cuts the magnetic field
  • C. The potential difference depends on the magnetic field density that is present
  • D. The potential difference depends on the diameter of the conductor that cuts the magnetic field
View Answer:

Answer: Option D

Solution:

20. A current of 10-A flows through a 1 mm diameter wire. What is the average number of electrons that pass through a cross section of the wire per second?

  • A. 1.6 x 1018 e/s
  • B. 6.2 x 1018 e/s
  • C. 1.6 x 1019 e/s
  • D. 6.3 x 1019 e/s
View Answer:

Answer: Option D

Solution:

21. Which of the following statements is true for steady-state conditions in a circuit powered by a dry a cell?

  • A. Voltage is dependent upon time
  • B. Capacitors behave as short circuits
  • C. Inductors behave as short circuits
  • D. Resistors behave as open circuits
View Answer:

Answer: Option C

Solution:

22. What is the internal resistance of a 9 V battery that delivers 100 A when its terminals are shorted?

  • A. 0.09 Ω
  • B. 11 Ω
  • C. 1.0 Ω
  • D. 90 Ω
View Answer:

Answer: Option A

Solution:

23. The change in the direction of a compass needle, when a current-carrying wire is brought near, is:

  • A. Electromagnetic deflection
  • B. Electrostatic force
  • C. Magnetic force
  • D. Electroscopic force
View Answer:

Answer: Option A

Solution:

24. Suppose a certain current in a galvanometer causes the needle to deflect 20 degrees, and then this current is doubled. The needle deflection:

  • A. Will decrease
  • B. Will stay the same
  • C. Will increase
  • D. Will reverse direction
View Answer:

Answer: Option C

Solution:

25. A unidirectional form of DC can be derived from which of the following sources?

  • A. Battery
  • B. Generator
  • C. Rectifier circuits
  • D. Power supply
View Answer:

Answer: Option B

Solution:

Electronics Engineering Mastery Test 12: ECE Pre-Board
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