CETA STUDY GUIDE
190+ (Fully Updated 2025-2026) Exam
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,Question 1
33 meters is the full wavelength in air for what RF frequency?
Correct Answer
36 MHz
Rationale:
The wavelength of a radio frequency (RF) is determined by the speed of light in air and the frequency itself, with the formula λ = c / f,
where λ is the wavelength, c is the speed of light in air (approximately 299,792,458 meters per second), and f is the frequency. By
rearranging this formula to solve for frequency and plugging in the given wavelength of 33 meters, we can calculate the corresponding
frequency that results in a full wavelength of 33 meters in air.
Question 2
Decimal 164 would appear as what in binary?
Correct Answer
10100100
Rationale:
To convert the decimal number 164 to binary, we divide the number by 2 and record the remainder, repeating the process until we
reach 0, which allows us to construct the binary representation from the sequence of remainders. The sequence of remainders when
dividing 164 by 2 is 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, which corresponds to the binary digits in the correct order.
Question 3
A resistor has color stripes yellow, violet, violet, silver. It is?
Correct Answer
470 MegOhm +/- 10%
Rationale:
The resistor's color stripes represent a specific resistance value based on the color code, where yellow represents a value of 4, violet
represents a multiplier of 10^2 (or 100), and the presence of a silver stripe indicates a tolerance of +/- 10%. The combination of
these values, 4 x 100 +/- 10%, is derived from the color code system to provide a precise calculation of the resistor's resistance.
Question 4
What is the total capacitance of three capacitors valued at 100uf, 100uf and 50uf when connected in series?
Correct Answer
25 pf
Rationale:
When capacitors are connected in series, the reciprocal of the total capacitance is equal to the sum of the reciprocals of the individual
capacitances, allowing us to calculate the total capacitance. By applying this formula, the total capacitance of three capacitors valued
at 100uf, 100uf, and 50uf can be determined to be 25 pf (picofarads).
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, Question 5
What is the ripple frequency of a full wave single phase bridge rectifier operated at 60 Hz?
Correct Answer
120 Hz
Rationale:
A full wave single phase bridge rectifier converts the entire AC waveform into a pulsating DC output, resulting in a frequency that is
twice the input frequency due to the rectification process. Therefore, when operated at 60 Hz, the ripple frequency of a full wave
single phase bridge rectifier is 120 Hz, which represents the rate at which a complete cycle of AC is converted into a pulsating DC
output.
Question 6
What emits a voltage when heated or cooled?
Correct Answer
Thermocouple
Rationale:
A thermocouple is a device that generates voltage due to the movement of electrons in response to temperature changes, known as
the Seebeck effect, which is a fundamental principle in thermoelectricity. This principle is based on the idea that different materials
have unique electronic properties that cause electrons to move when exposed to varying temperatures, resulting in a measurable
voltage.
Question 7
Adding the binary numbers 101011 and 001110 will give you what result?
Correct Answer
111001
Rationale:
When adding binary numbers, each column represents the sum of the corresponding bits from both numbers, carrying over 1 if the
sum exceeds 1. In the case of 101011 and 001110, adding each column from right to left and considering carryovers yields the result.
Question 8
A component that reduces in resistance as it is heated.
Correct Answer
A negative temperature coefficient thermistor
Rationale:
A negative temperature coefficient thermistor is the correct answer because it decreases in resistance as its temperature increases,
making it a component that reduces in resistance as it is heated. This is due to its inherent property of having a negative temperature
coefficient, meaning its resistance decreases as temperature rises, allowing it to achieve the described behavior.
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190+ (Fully Updated 2025-2026) Exam
Questions + Verified & Rationalized
Answers | A+ Graded
100% Guarantee Pass
✓ This Exam contains: CETa study guide
✓ 100% Accurate Questions and Answers
✓ 100% Guarantee Pass - Verified by Experts
✓ Each Question Includes The Correct Answer
✓ Expert-Verified
Trusted by thousands of students and professionals worldwide Page 1 of 30
,Question 1
33 meters is the full wavelength in air for what RF frequency?
Correct Answer
36 MHz
Rationale:
The wavelength of a radio frequency (RF) is determined by the speed of light in air and the frequency itself, with the formula λ = c / f,
where λ is the wavelength, c is the speed of light in air (approximately 299,792,458 meters per second), and f is the frequency. By
rearranging this formula to solve for frequency and plugging in the given wavelength of 33 meters, we can calculate the corresponding
frequency that results in a full wavelength of 33 meters in air.
Question 2
Decimal 164 would appear as what in binary?
Correct Answer
10100100
Rationale:
To convert the decimal number 164 to binary, we divide the number by 2 and record the remainder, repeating the process until we
reach 0, which allows us to construct the binary representation from the sequence of remainders. The sequence of remainders when
dividing 164 by 2 is 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, which corresponds to the binary digits in the correct order.
Question 3
A resistor has color stripes yellow, violet, violet, silver. It is?
Correct Answer
470 MegOhm +/- 10%
Rationale:
The resistor's color stripes represent a specific resistance value based on the color code, where yellow represents a value of 4, violet
represents a multiplier of 10^2 (or 100), and the presence of a silver stripe indicates a tolerance of +/- 10%. The combination of
these values, 4 x 100 +/- 10%, is derived from the color code system to provide a precise calculation of the resistor's resistance.
Question 4
What is the total capacitance of three capacitors valued at 100uf, 100uf and 50uf when connected in series?
Correct Answer
25 pf
Rationale:
When capacitors are connected in series, the reciprocal of the total capacitance is equal to the sum of the reciprocals of the individual
capacitances, allowing us to calculate the total capacitance. By applying this formula, the total capacitance of three capacitors valued
at 100uf, 100uf, and 50uf can be determined to be 25 pf (picofarads).
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, Question 5
What is the ripple frequency of a full wave single phase bridge rectifier operated at 60 Hz?
Correct Answer
120 Hz
Rationale:
A full wave single phase bridge rectifier converts the entire AC waveform into a pulsating DC output, resulting in a frequency that is
twice the input frequency due to the rectification process. Therefore, when operated at 60 Hz, the ripple frequency of a full wave
single phase bridge rectifier is 120 Hz, which represents the rate at which a complete cycle of AC is converted into a pulsating DC
output.
Question 6
What emits a voltage when heated or cooled?
Correct Answer
Thermocouple
Rationale:
A thermocouple is a device that generates voltage due to the movement of electrons in response to temperature changes, known as
the Seebeck effect, which is a fundamental principle in thermoelectricity. This principle is based on the idea that different materials
have unique electronic properties that cause electrons to move when exposed to varying temperatures, resulting in a measurable
voltage.
Question 7
Adding the binary numbers 101011 and 001110 will give you what result?
Correct Answer
111001
Rationale:
When adding binary numbers, each column represents the sum of the corresponding bits from both numbers, carrying over 1 if the
sum exceeds 1. In the case of 101011 and 001110, adding each column from right to left and considering carryovers yields the result.
Question 8
A component that reduces in resistance as it is heated.
Correct Answer
A negative temperature coefficient thermistor
Rationale:
A negative temperature coefficient thermistor is the correct answer because it decreases in resistance as its temperature increases,
making it a component that reduces in resistance as it is heated. This is due to its inherent property of having a negative temperature
coefficient, meaning its resistance decreases as temperature rises, allowing it to achieve the described behavior.
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