 # Electronics Engineering Mastery Test 4: ECE Pre-Board

(Last Updated On: December 25, 2017) This is 100 items Practice Examinations set 4 in Electronics Engineering composed of previous 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 4

Choose the letter of the best answer in each questions.

1. How much current does an electrostatic voltmeter require through it to operate?

• A. Zero current
• B. Below one ampere
• C. One ampere
• D. Very high current
View Answer:

Answer: Option A

Solution:

2. Determine the equivalent work of 166 watt – second

• A. 166 Joules
• B. 100 Joules
• C. 16.6 Joules
• D. 10 Joules
View Answer:

Answer: Option A

Solution:

3. Characteristics of the current flow in a series R-L-C circuit at resonance

• A. it is dc
• B. it is at a minimum
• C. it is zero
• D. it is at a maximum
View Answer:

Answer: Option D

Solution:

4. What is the value of a resistor with colours from left. Orange, blue, gold and silver?

• A. 34 ohms +/- 10%
• B. 3.6 ohms +/- 10%
• C. 3.4 ohms +/- 10%
• D. 36 ohms +/- 10%
View Answer:

Answer: Option B

Solution:

5. Which of the following characterizes inductance?

• A. tends to oppose dc
• B. tends to oppose changes in voltage
• C. tends to oppose changes in current
• D. oppose all frequencies equally
View Answer:

Answer: Option C

Solution:

6. One of the following does not refer to the internal component of a klystron oscillator

• A. a collector plate
• B. a pair of plates
• C. a pair of catcher grids
• D. a pair of buncher grids
View Answer:

Answer: Option B

Solution:

7. How can electrical current be inducted with a coil and a magnet?

• A. holding the coil and the magnet perfectly stationary
• B. moving either the magnet or the coil
• C. placing the coil parallel to the magnetic field
• D. placing the coil at right angles with the magnetic field
View Answer:

Answer: Option B

Solution:

8. Which of the following integrated circuit contains the most gates?

• A. LSI
• B. MSI
• C. VLSI
• D. SSI
View Answer:

Answer: Option C

Solution:

9. Which of the following is not primary type cell?

• A. Zinc chloride
• B. Silver zinc
• C. Silver oxide
• D. Carbon zinc
View Answer:

Answer: Option B

Solution:

10. A Transformer consist of the following

• A. an inductance and resistance
• B. a parallel resonant circuit
• C. a capacitor and inductor
• D. two coils wound on a common core
View Answer:

Answer: Option D

Solution:

11. What type of tube is used to display a signal on an oscilloscope?

• A. Filament tube
• B. Cathode ray tube
• C. Tetrode
• D. Pentode
View Answer:

Answer: Option B

Solution:

12. Meaning of the term transition region with regard to a transistor.

• A. the point where wire leads are connected to the P or N type material
• B. an area of low charge density around the P-N junction
• C. The area of maximum P-type charge
• D. The area of maximum N-type charge
View Answer:

Answer: Option B

Solution:

13. What is the resonant frequency of a circuit when L of 25 micro henrys and C of 10 picofarads are in parallel?

• A. 63.7 MHz
• B. 10.1 MHz
• C. 63.7 KHz
• D. 10.1 KHz
View Answer:

Answer: Option B

Solution:

14. When should a fuse be replaced with a higher rated unit?

• A. Never
• B. When the original value is not available
• C. If it blows
• D. When the fuse of the original value is small in size
View Answer:

Answer: Option A

Solution:

15. What is the resonant frequency of a circuit when L of 3 micro henrys and C of 40 picofarads are in series?

• A. 1.33 MHz
• B. 14.5 kHz
• C. 1.33 kHz
• D. 14.5 MHz
View Answer:

Answer: Option D

Solution:

16. Find the two stable operating conditions of SCR

• A. conducting and non-conducting
• B. oscillating and quiescent
• C. NPN conduction and PNP Conduction
• D. forward conducting and reverse conducting
View Answer:

Answer: Option A

Solution:

17. A filter having a single continuous transmission band with neither the upper nor the lower cut off frequencies being zero to infinite is called _______

• A. Band pass filter
• B. Longitudinal suppression filter
• C. High pass filter
• D. Band rejection filter
View Answer:

Answer: Option A

Solution:

18. What physical effect will a two parallel wires and with the same direction of current flowing over them?

• A. maintain position
• B. repel each other
• C. no physical effect
• D. attract each other
View Answer:

Answer: Option D

Solution:

19. Determine which item is not a storage device

• A. Card readers
• B. CD-ROM
• C. Diskettes
• D. Magnetic tape
View Answer:

Answer: Option A

Solution:

20. Find the frequency in kilocycles per second in the armature of a 10 pole, 1,200 rpm generator

• A. 100
• B. 1000
• C. 10
• D. 0.100
View Answer:

Answer: Option A

Solution:

21. Ohm’s law refers to ________.

• A. A current is directly proportional to both voltage and resistance
• B. power is directly proportional to the resistance and inversely as the current squared
• C. power is directly proportional to both voltage squared and the resistance
• D. current varies directly as the voltage and inversely as the resistance
View Answer:

Answer: Option D

Solution:

22. A transistor acts as _________ when saturated.

• A. open circuit
• B. very low resistance
• C. very high resistance
• D. variable resistance
View Answer:

Answer: Option B

Solution:

23. Another very useful cell similar to solar cells however the junction is bombarded by beta particles from radioactive materials

• A. Alkaline cells
• B. Nucleus cells
• C. Selenium cells
• D. Lithium cells
View Answer:

Answer: Option C

Solution:

24. What is an element in electronics which serves as a protection against overload?

• A. Fuse
• B. Resistor
• C. Mica
• D. Semiconductor
View Answer:

Answer: Option A

Solution:

25. If two 0.25 micro farad capacitors are connected in series, what will be the total effective capacitance?

• A. 0.125 microfarad
• B. 0.0624 microfarad
• C. 2.5 microfarad
• D. 0.50 microfarad
View Answer:

Answer: Option A

Solution:

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