 # Electronics Engineering Mastery Test 10: ECE Pre-Board

(Last Updated On: December 23, 2017) This is 100 items set of Practice Examination 10 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 10

Choose the letter of the best answer in each questions.

1. What probable effect on the human body if subjected to a current of 40 to 100 mA, 60 Hz, AC or 160 to 300 mA, DC?

• A. Respiratory failure
• B. Perception
• C. Reflex action
• D. Mascular inhibition
View Answer:

Answer: Option A

Solution:

2. What probable effect on the human body if subjected to a current of over 100 mA, 60 Hz, AC or 300 mA, DC?

• A. Respiratory failure
• B. Fatal
• C. Reflex action
• D. Mascular inhibition
View Answer:

Answer: Option B

Solution:

3. What refers to the jarring, shaking sensation you receive from contact with electricity?

• A. Respiratory failure
• B. Electric shock
• C. Fatal
• D. Mascular inhibition
View Answer:

Answer: Option B

Solution:

4. Mechanical rotation frequency is measured using a device called ______.

• A. frequency counter
• B. frequency meter
• C. accelerometer
• D. tachometer
View Answer:

Answer: Option D

Solution:

5. Electrical-output frequencies of ac generators can be measured by ______.

• A. vibrating-reed devices or tuned circuits
• B. accelerometer
• C. frequency meter
• D. tachometer
View Answer:

Answer: Option A

Solution:

6. Audio frequencies can be measured by a process known as ______.

• A. frequency counting
• B. zero beating
• C. beating
• D. mixing
View Answer:

Answer: Option B

Solution:

7. What is another term for zero beating?

• A. Frequency counting
• B. Heterodyning
• C. Beating
• D. Mixing
View Answer:

Answer: Option B

Solution:

8. What wavemeter is used for measuring frequencies in the microwave range?

• A. Frequency counter
• B. Bolometer
• C. Cavity wavemeter.
• D. Absorption wavemeter
View Answer:

Answer: Option C

Solution:

9. What is the process of matching an unknown signal with a locally generated signal of the same frequency obtained from a calibrated high-precision oscillator?

• A. Frequency counting
• B. Zero beating
• C. Beating
• D. Mixing
View Answer:

Answer: Option B

Solution:

10. What device that sweeps over a band of frequencies to determine what frequencies are being produced by a specific circuit under test and the amplitude of each frequency component?

• A. Frequency counter
• B. Bolometer
• C. Cavity wavemeter
• D. Spectrum analyzer
View Answer:

Answer: Option D

Solution:

11. What is commonly used for the analysis of waveforms generated by electronic equipment?

• A. Frequency counter
• B. Cavity wavemeter
• C. Cathode-Ray Oscilloscope (CRO or O-SCOPE)
• D. Bolometer
View Answer:

Answer: Option C

Solution:

12. What is device used to measure frequencies above the audio range?

• A. Frequency counter
• B. Cavity wavemeter
• C. Bolometer
• D. Electronic Frequency Counter
View Answer:

Answer: Option D

Solution:

13. What are calibrated resonant circuits used to measure frequency?

• A. Frequency counter
• B. Wavemeters
• C. Cavity wavemeter
• D. Spectrum analyzer
View Answer:

Answer: Option B

Solution:

14. What is the difference in frequency between the oscillator frequency and the unknown frequency?

• A. Beat frequency
• B. lF
• C. Image frequency
• D. Signal frequency
View Answer:

Answer: Option A

Solution:

15. The rotation frequency of recording devices and teletypewriter motors can be measured by the use of a ______.

• A. Tachometer
• B. Oscilloscope
• C. Frequency counter
• D. Stroboscope
View Answer:

Answer: Option D

Solution:

16. What is an instrument that allows you to view rotating or reciprocating objects intermittently and produces the optical effect of a slowing down or stopping motion?

• A. Tachometer
• B. Oscilloscope
• C. Frequency counter
• D. Stroboscope
View Answer:

Answer: Option D

Solution:

17. What is an electronic flash device in which the flash duration is very short, a few millionths of a second and can measure very rapid motion?

• A. Tachometer
• B. Strobotac
• C. Frequency counter
• D. Stroboscope
View Answer:

Answer: Option B

Solution:

18. What is a combination of watch and revolution counter?

• A. Chronometric tachometer
• B. Frequency counter
• C. Strobotac
• D. Stroboscope
View Answer:

Answer: Option A

Solution:

19. What type of bolometer is characterized by an increase in resistance as the dissipated power rises?

• A. Chronometric tachometer
• B. Strobotac
• C. Barretter
• D. Stroboscope
View Answer:

Answer: Option C

Solution:

20. What type of bolometer is characterized by decrease in resistance as the power increases?

• A. Chronometrictachometer
• B. Strobotac
• C. Barretter
• D. Thermistor
View Answer:

Answer: Option D

Solution:

21. What instrument is used for measuring radio frequency (rf) power?

• A. Thermocouple ammeter
• B. Strobotac
• C. Barretter
• D. Thermistor
View Answer:

Answer: Option A

Solution:

22. When using strobotac, at what speed is "flicker" becomes a problem because the human eye can retain successive images long enough to create the illusion of continuous motion?

• A. 600 rpm
• B. 500 rpm
• C. 1200 rpm
• D. 300 rpm
View Answer:

Answer: Option A

Solution:

23. What is the approximate life of the strobotron lamp if used at flashing speeds of less than 5,000 rpm?

• A. 250 hours
• B. 500 hours
• C. 1200 hours
• D. 300 hours
View Answer:

Answer: Option A

Solution:

24. What is the approximate life of the strobotron lamp if used at flashing speeds of more than 5,000 rpm?

• A. 250 hours
• B. 500 hours
• C. 100 hours
• D. 300 hours
View Answer:

Answer: Option C

Solution:

25. What are used as filters for the passage or rejection of specific frequencies?

• A. Tuned circuits
• B. Filter circuits
• C. Band pass filter
• D. High pass filter
View Answer:

Answer: Option A

Solution:

Rate this:

NEED SUPPORT: LIKE MY PAGE & SHARE