Electronics Engineering Mastery Test 11: ECE Pre-Board

(Last Updated On: March 22, 2018)

Electronics Engineering Exam 11

This is 100 items set of Practice Examination 11 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 11

Choose the letter of the best answer in each questions.

1. A power derating factor of 3.33 mW/°C above 50°C means that

  • A. you must decrease the DC power dissipation rating by 3.33 mW for every 1°C rise in the operating temperature above 50°C
  • B. you will end up getting a power of 3.33 mW if temperature goes beyond 50°C
  • C. you must increase the DC power dissipation rating by 3.33 mW for every 1°C rise in the operating temperature above 50°C
  • D. your zener diode will dissipate a nominal DC power of 3.33 mW for temperature above 50°C
View Answer:

Answer: Option A

Solution:

2. When you first turn a power supply on, the filter capacitor initially acts as a short circuit thus creating a high initial current that can possibly destroy your rectifier diodes. What is the best way to limit the said current but without sacrificing the output voltage?

  • A. use a large-value series current-limiting resistor
  • B. use large-value filter capacitors
  • C. use inductive filters instead of capacitive filters
  • D. don’t turn off your power supply
View Answer:

Answer: Option C

Solution:

3. The electromagnetic force induced between a varying magnetic field and a stationary conductor.

  • A. Mutually induced EMF
  • B. Self-induced EMF
  • C. Electro statically induced EMF
  • D. Statically induced EMF
View Answer:

Answer: Option D

Solution:

4. A wire has a resistance of 5 Ω at room temperature and a temperature coefficient α = 4 × 10-3/°C. Calculate the wire resistance if the temperature rises by 75°C.

  • A. 6.5 Ω
  • B. 6.1 Ω
  • C. 6 Ω
  • D. 6.16 Ω
View Answer:

Answer: Option A

Solution:

5. A combination of two charges with equal charge magnitude but opposite signs.

  • A. magnetic dipole
  • B. static dipole
  • C. dynamic dipole
  • D. electric dipole
View Answer:

Answer: Option D

Solution:

6. If a dc electromagnetic of 10-V produces a steady-state current of 100-mA in a 100 Ω coil, how much will the current be after 0.2 sec?

  • A. 63 mA
  • B. 100 mA
  • C. 37 mA
  • D. 200 Ma
View Answer:

Answer: Option A

Solution:

7. What is the time constant of a 20-H coil having 100 Ω of series resistance?

  • A. 5 s
  • B. 0.5 s
  • C. 0.2 s
  • D. 20 ms
View Answer:

Answer: Option C

Solution:

8. If the RC time constant is given to be 1 s, how long will it take for the voltage to drop from 100 V to 50 V?

  • A. 0.63 s
  • B. 0.37 s
  • C. 0.5 s
  • D. 0.7 s
View Answer:

Answer: Option D

Solution:

9. The effect of little change in magnetic flux density when magnetic field intensity increases.

  • A. Retentivity
  • B. Coercivity
  • C. Saturation
  • D. Permeability
View Answer:

Answer: Option C

Solution:

10. A series resonant circuit at 0.2 MHz develops 100 mV across a 250 µH coil with a 2 mV input. Calculate Q.

  • A. 50
  • B. 25
  • C. 100
  • D. 200
View Answer:

Answer: Option A

Solution:

11. A point in magnet where the intensity of magnetic lines of force is a maximum.

  • A. North Pole
  • B. Saturation Point
  • C. Coercive point
  • D. Magnetic pole
View Answer:

Answer: Option D

Solution:

12. An oscillator circuit that has two capacitors and one inductor on its feedback network

  • A. Colpitts
  • B. Clapp
  • C. Hartley
  • D. Pierce Crystal
View Answer:

Answer: Option A

Solution:

13. The ability of a substance of getting magnetized is called

  • A. Retentivity
  • B. Permeability
  • C. Coercivity
  • D. Susceptibility
View Answer:

Answer: Option D

Solution:

14. A 12 volt battery is connected to a 5 cm, 350 turn coil with resistance of 15-Ω. What is the field strength produced in Oe?

  • A. 70
  • B. 280
  • C. 56
  • D. 353
View Answer:

Answer: Option A

Solution:

15. A magnetic material has a relative permeability of 500. What is the absolute permeability of the material in cgs system?

  • A. 500
  • B. 630 H/m
  • C. 500 G/Oe
  • D. 630 x 10-6 G/Oe
View Answer:

Answer: Option C

Solution:

16. The reciprocal of reluctance corresponds to what in electric circuits?

  • A. Permeance
  • B. Admittance
  • C. Impedance
  • D. Conductance
View Answer:

Answer: Option D

Solution:

17. A material with negative temperature coefficient means

  • A. Its resistance will increase as temperature increases
  • B. Its resistance will decrease as temperature decreases
  • C. Its resistance will increase as temperature decreases
  • D. Its resistance will decrease as temperature increases
View Answer:

Answer: Option D

Solution:

18. A 12-V battery with a capacity of 100 A-hr is used to supply 300-W electronic equipment and a 25 W light. How long will this battery last?

  • A. 7.38 hours
  • B. 3.69 hours
  • C. 5.22 hours
  • D. 2.61 hours
View Answer:

Answer: Option A

Solution:

19. The physical motion that is due to the forces of magnetic fields

  • A. Repulsion
  • B. Attraction
  • C. Motor Action
  • D. Rotation
View Answer:

Answer: Option C

Solution:

20. Which of these statements is FALSE about the relationship of the magnetic force on a moving charge?

  • A. A magnetic force does not point in the direction of the field or in the direction of the charge’s velocity
  • B. A magnetic force is exerted on a moving electric charge
  • C. No magnetic force is exerted on a charge at rest
  • D. A magnetic force is exerted on a charge moving along the direction of the magnetic field
View Answer:

Answer: Option B

Solution:

21. Indicate which of the following statements is FALSE.

  • A. Capacitive reactance is a measure of the reaction of C to a change in voltage
  • B. RC time constant is a measure of the reaction of C to a change in voltage
  • C. The concept of reactance is useful for both sine wave AC circuits and non-sinusoidal waveforms
  • D. The method of time constant is used to analyze both sinusoidal and non-sinusoidal waveforms
View Answer:

Answer: Option C

Solution:

22. It is the ability of an insulator to concentrate electric flux

  • A. Permeability
  • B. Susceptibility
  • C. Permittivity
  • D. Retentivity
View Answer:

Answer: Option C

Solution:

23. It is commonly used for precision wire-wound resistors, which do not change resistance when the temperature increases

  • A. carbon
  • B. aluminum
  • C. constantan
  • D. iron
View Answer:

Answer: Option C

Solution:

24. Which of the following statements is true about the force on a current-carrying straight conductor in a magnetic field?

  • A. With the conductor at 90°, the reaction between two magnetic fields is minimum
  • B. With the conductor at 0°, there is no effect between them
  • C. With the conductor is at angle between 0° and 90°, only the parallel component is effective
  • D. A motor action can be produced if the conductor is placed parallel to the magnetic field
View Answer:

Answer: Option B

Solution:

25. It is known as the breakdown voltage of a dielectric material.

  • A. relative permittivity
  • B. dielectric strength
  • C. velocity reduction ratio
  • D. velocity factor
View Answer:

Answer: Option B

Solution:

Electronics Engineering Mastery Test 11: ECE Pre-Board
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