CETa OA FINAL EXAM QUESTIONS
WITH CORRECT SOLUTIONS A+
GRADED||UPDATED 2026/2027
SYLLABUS||<<RECENT VERSION>>
1) When voltage is applied to a capacitor: - ANSWER ✓ current is maximum
at first, then reduces as the capacitor becomes charges.
2) An electrolytic capacitor in series between the power transformer and the
rectifiers in a power supply: - ANSWER ✓ is part of a voltage doubler
circuit
3) Information travels through optic fiber via the flow of: - ANSWER ✓
photons
4) You would most likely prefer an analog VOM over a DMM for: - ANSWER
✓ accuracy
5) Which of these circuits would most likely use a zener diode? - ANSWER ✓
a power regulator
6) A block in a digital diagram is called a NOR. Which is true? - ANSWER ✓
It is a NOT OR or Inverted OR
7) Which of these statements is most true relating to schematic diagrams of
electronic devices? - ANSWER ✓ They represent signal paths
8) In personal computer technology, ROM indicates: - ANSWER ✓ memory
that may only be read from
9) A light emitting diode will light when: - ANSWER ✓ It is forward biased.
10) A zener diode is rated 6.3V. This tells you: - ANSWER ✓ it conducts
to limit the voltage across it to 6.3V
,11) A triac is frequently used: - ANSWER ✓ for motor speed control, to
electronically turn equipment on and off
12) A technician must be knowledgeable about "ESD": - ANSWER ✓
because static discharge can destroy many components.
13) In a motor, the counter-emf voltage induced in the armature the source
current. - ANSWER ✓ subtracts from
14) One significant difference between a TV antenna and a CB antenna
would be: - ANSWER ✓ TV is polarized horizontal while CB is vertical
15) "Switching power supplies": - ANSWER ✓ sometimes called DC to
DC converters, maybe operated of AC or DC sources
16) Which of these would you likely find in a DC motor speed control
circuit? - ANSWER ✓ An op-amp
17) A transformer on a schematic has two leads connected to the primary
and three to the secondary, one to each end and one in the middle. This is an:
- ANSWER ✓ center tapped secondary transformer
18) The 9 pin DB9 connector serial port on a PC is commonly called the: -
ANSWER ✓ RS232 standard
19) Three capacitors, of 470pf, 560pf and .47pf are in parallel with each
other. The total is: - ANSWER ✓ 1030.47pf
20) Ohm's law provides equations relating to: - ANSWER ✓ Volts, amps
and resistance
21) A power source such as a generator or battery might be compared to
what component in a water supply system? - ANSWER ✓ A water tank
22) Which of these is a good indication of the quality of an analog meter?
- ANSWER ✓ The ohms per volt rating
, 23) The vertical axis of an oscilloscope display is also called the: -
ANSWER ✓ Y axis
24) If you increase the value of an inductor, the inductive reactance will: -
ANSWER ✓ increase
25) Which would least likely be a high-voltage(above 1000V) capacitor? -
ANSWER ✓ electrolytic
26) The rechargeable cell currently used in many consumer portable
products would be: - ANSWER ✓ Lithium-ion
27) A solid-state regulator: - ANSWER ✓ Varies conduction to maintain
a level output voltage
A current-carrying conductor is placed in a magnetic field perpendicular to the
lines of flux. It tends to move in what direction to the force of magnetic lines of
flux, as determined by Flemings left-hand rule. - ANSWER ✓ an opposite
The antenna used to compare the gain of other antennas is called a: - ANSWER ✓
dipole
The component that effectively becomes a short when turned on, and is turned off
by disconnecting the path from the anode to cathode is the: - ANSWER ✓ silicon
controlled rectifier
Which of these terms would you most expect to see when referring to types of
resistors? - ANSWER ✓ metal film
"microwave" as used in radio electronics, refers to: - ANSWER ✓ 1 GHz - 100
GHz radio frequencies
A differential amplifier whose two input signals are equal, but 180 degrees out of
phase, will have an - ANSWER ✓ maximum output signal
Which of these can be used to control the output level of a generator? - ANSWER
✓ small DC voltage applied to the field winding
, Impedance(Z, in ohms) includes: - ANSWER ✓ Resistance, capacitive reactance
and inductive reactance
The velocity factor in an RF transmission line is determined by: - ANSWER ✓
the dielectric material between the center conductor and shield
A fuse, marked 250V, 650 ma can be used in circuits with an "open-fuse" supply
voltage of: - ANSWER ✓ 125 volts
A thermistor: - ANSWER ✓ changes resistance with temperature
When a transformer is designed, what most determines the output voltage from the
secondary? - ANSWER ✓ The ratio of primary to secondary turns
Adding armature windings in parallel to a generator's existing windings: -
ANSWER ✓ improves its voltage stability
A 10W signal is received at 5W. How many dB loss? - ANSWER ✓ 3 dB loss
It is desired to raise the power to a speaker from 15W to 30. This is a: - ANSWER
✓ 3dB increase
Which of these IC or semiconductor devices normally requires the most careful
handling to avoid damage by static electricity? - ANSWER ✓ CMOS
Which of these components most closely compares to the output of a solar cell? -
ANSWER ✓ A NiCad battery
What is the formula for determining ACPH of HEPA filtered air?
A. Total FPM x 60 / Ft^2
B. Total CFM x 60 / Ft^2
C. Avg. CFM x 60 / Ft^3
D. Total CFM x 60 / Ft^3 - ANSWER ✓ D. Total CFM x 60 / Ft^3
What is the minimum differential pressure requirement between a positive
pressure buffer room and its associated ante room?
WITH CORRECT SOLUTIONS A+
GRADED||UPDATED 2026/2027
SYLLABUS||<<RECENT VERSION>>
1) When voltage is applied to a capacitor: - ANSWER ✓ current is maximum
at first, then reduces as the capacitor becomes charges.
2) An electrolytic capacitor in series between the power transformer and the
rectifiers in a power supply: - ANSWER ✓ is part of a voltage doubler
circuit
3) Information travels through optic fiber via the flow of: - ANSWER ✓
photons
4) You would most likely prefer an analog VOM over a DMM for: - ANSWER
✓ accuracy
5) Which of these circuits would most likely use a zener diode? - ANSWER ✓
a power regulator
6) A block in a digital diagram is called a NOR. Which is true? - ANSWER ✓
It is a NOT OR or Inverted OR
7) Which of these statements is most true relating to schematic diagrams of
electronic devices? - ANSWER ✓ They represent signal paths
8) In personal computer technology, ROM indicates: - ANSWER ✓ memory
that may only be read from
9) A light emitting diode will light when: - ANSWER ✓ It is forward biased.
10) A zener diode is rated 6.3V. This tells you: - ANSWER ✓ it conducts
to limit the voltage across it to 6.3V
,11) A triac is frequently used: - ANSWER ✓ for motor speed control, to
electronically turn equipment on and off
12) A technician must be knowledgeable about "ESD": - ANSWER ✓
because static discharge can destroy many components.
13) In a motor, the counter-emf voltage induced in the armature the source
current. - ANSWER ✓ subtracts from
14) One significant difference between a TV antenna and a CB antenna
would be: - ANSWER ✓ TV is polarized horizontal while CB is vertical
15) "Switching power supplies": - ANSWER ✓ sometimes called DC to
DC converters, maybe operated of AC or DC sources
16) Which of these would you likely find in a DC motor speed control
circuit? - ANSWER ✓ An op-amp
17) A transformer on a schematic has two leads connected to the primary
and three to the secondary, one to each end and one in the middle. This is an:
- ANSWER ✓ center tapped secondary transformer
18) The 9 pin DB9 connector serial port on a PC is commonly called the: -
ANSWER ✓ RS232 standard
19) Three capacitors, of 470pf, 560pf and .47pf are in parallel with each
other. The total is: - ANSWER ✓ 1030.47pf
20) Ohm's law provides equations relating to: - ANSWER ✓ Volts, amps
and resistance
21) A power source such as a generator or battery might be compared to
what component in a water supply system? - ANSWER ✓ A water tank
22) Which of these is a good indication of the quality of an analog meter?
- ANSWER ✓ The ohms per volt rating
, 23) The vertical axis of an oscilloscope display is also called the: -
ANSWER ✓ Y axis
24) If you increase the value of an inductor, the inductive reactance will: -
ANSWER ✓ increase
25) Which would least likely be a high-voltage(above 1000V) capacitor? -
ANSWER ✓ electrolytic
26) The rechargeable cell currently used in many consumer portable
products would be: - ANSWER ✓ Lithium-ion
27) A solid-state regulator: - ANSWER ✓ Varies conduction to maintain
a level output voltage
A current-carrying conductor is placed in a magnetic field perpendicular to the
lines of flux. It tends to move in what direction to the force of magnetic lines of
flux, as determined by Flemings left-hand rule. - ANSWER ✓ an opposite
The antenna used to compare the gain of other antennas is called a: - ANSWER ✓
dipole
The component that effectively becomes a short when turned on, and is turned off
by disconnecting the path from the anode to cathode is the: - ANSWER ✓ silicon
controlled rectifier
Which of these terms would you most expect to see when referring to types of
resistors? - ANSWER ✓ metal film
"microwave" as used in radio electronics, refers to: - ANSWER ✓ 1 GHz - 100
GHz radio frequencies
A differential amplifier whose two input signals are equal, but 180 degrees out of
phase, will have an - ANSWER ✓ maximum output signal
Which of these can be used to control the output level of a generator? - ANSWER
✓ small DC voltage applied to the field winding
, Impedance(Z, in ohms) includes: - ANSWER ✓ Resistance, capacitive reactance
and inductive reactance
The velocity factor in an RF transmission line is determined by: - ANSWER ✓
the dielectric material between the center conductor and shield
A fuse, marked 250V, 650 ma can be used in circuits with an "open-fuse" supply
voltage of: - ANSWER ✓ 125 volts
A thermistor: - ANSWER ✓ changes resistance with temperature
When a transformer is designed, what most determines the output voltage from the
secondary? - ANSWER ✓ The ratio of primary to secondary turns
Adding armature windings in parallel to a generator's existing windings: -
ANSWER ✓ improves its voltage stability
A 10W signal is received at 5W. How many dB loss? - ANSWER ✓ 3 dB loss
It is desired to raise the power to a speaker from 15W to 30. This is a: - ANSWER
✓ 3dB increase
Which of these IC or semiconductor devices normally requires the most careful
handling to avoid damage by static electricity? - ANSWER ✓ CMOS
Which of these components most closely compares to the output of a solar cell? -
ANSWER ✓ A NiCad battery
What is the formula for determining ACPH of HEPA filtered air?
A. Total FPM x 60 / Ft^2
B. Total CFM x 60 / Ft^2
C. Avg. CFM x 60 / Ft^3
D. Total CFM x 60 / Ft^3 - ANSWER ✓ D. Total CFM x 60 / Ft^3
What is the minimum differential pressure requirement between a positive
pressure buffer room and its associated ante room?
