CETA PRACTICE EXAMS ANSWERS AND QUESTIONS
SET A+
✔✔A "Video Signal" is defined as: - ✔✔baseband including visual information
✔✔You are servicing a power supply and have disconnected power. It has several 250
uf capacitors connected in parallel. To avoid shock these capacitors: - ✔✔Should be
discharged to chassis ground, through a suitable resistor
✔✔A schematic used in electronic: - ✔✔is much like a road map for following signals
✔✔High voltage should be discharged before servicing a product. After disabling AC
input power, discharge a high voltage power source by: - ✔✔draining thru a large value
resistor to chassis ground
✔✔Which of these would be an important electrical consideration in the use of a
transformer? - ✔✔The operating frequency
✔✔If a 12v product is dissipating 50w, how much load resistance does the device
represent? - ✔✔2.9 ohms
✔✔An "audio signal" is defined as: - ✔✔frequencies in the 20Hz to 15000Hz range
✔✔What will cause a generator to produce DC voltage rather then AC? - ✔✔the
commutator
✔✔You suspect the unit has an internal short. To prevent further damage when you
apply power, you should: - ✔✔insert a low resistance high wattage(100ohm, 10w)
resistor in series with the power input.
✔✔A ripple counter: - ✔✔Is two or more logical flip-flops connected sequentially with the
input pulses toggling the first one
, ✔✔When voltage is applied to a capacitor: - ✔✔current is maximum at first, then
reduces as the capacitor becomes charges.
✔✔An electrolytic capacitor in series between the power transformer and the rectifiers
in a power supply: - ✔✔is part of a voltage doubler circuit
✔✔Information travels through optic fiber via the flow of: - ✔✔photons
✔✔You would most likely prefer an analog VOM over a DMM for: - ✔✔accuracy
✔✔Which of these circuits would most likely use a zener diode? - ✔✔a power regulator
✔✔A block in a digital diagram is called a NOR. Which is true? - ✔✔It is a NOT OR or
Inverted OR
✔✔Which of these statements is most true relating to schematic diagrams of electronic
devices? - ✔✔They represent signal paths
✔✔In personal computer technology, ROM indicates: - ✔✔memory that may only be
read from
✔✔A light emitting diode will light when: - ✔✔It is forward biased.
✔✔A zener diode is rated 6.3V. This tells you: - ✔✔it conducts to limit the voltage
across it to 6.3V
✔✔A triac is frequently used: - ✔✔for motor speed control, to electronically turn
equipment on and off
✔✔A technician must be knowledgeable about "ESD": - ✔✔because static discharge
can destroy many components.
✔✔In a motor, the counter-emf voltage induced in the armature the source current. -
✔✔subtracts from
✔✔One significant difference between a TV antenna and a CB antenna would be: -
✔✔TV is polarized horizontal while CB is vertical
✔✔"Switching power supplies": - ✔✔sometimes called DC to DC converters, maybe
operated of AC or DC sources
SET A+
✔✔A "Video Signal" is defined as: - ✔✔baseband including visual information
✔✔You are servicing a power supply and have disconnected power. It has several 250
uf capacitors connected in parallel. To avoid shock these capacitors: - ✔✔Should be
discharged to chassis ground, through a suitable resistor
✔✔A schematic used in electronic: - ✔✔is much like a road map for following signals
✔✔High voltage should be discharged before servicing a product. After disabling AC
input power, discharge a high voltage power source by: - ✔✔draining thru a large value
resistor to chassis ground
✔✔Which of these would be an important electrical consideration in the use of a
transformer? - ✔✔The operating frequency
✔✔If a 12v product is dissipating 50w, how much load resistance does the device
represent? - ✔✔2.9 ohms
✔✔An "audio signal" is defined as: - ✔✔frequencies in the 20Hz to 15000Hz range
✔✔What will cause a generator to produce DC voltage rather then AC? - ✔✔the
commutator
✔✔You suspect the unit has an internal short. To prevent further damage when you
apply power, you should: - ✔✔insert a low resistance high wattage(100ohm, 10w)
resistor in series with the power input.
✔✔A ripple counter: - ✔✔Is two or more logical flip-flops connected sequentially with the
input pulses toggling the first one
, ✔✔When voltage is applied to a capacitor: - ✔✔current is maximum at first, then
reduces as the capacitor becomes charges.
✔✔An electrolytic capacitor in series between the power transformer and the rectifiers
in a power supply: - ✔✔is part of a voltage doubler circuit
✔✔Information travels through optic fiber via the flow of: - ✔✔photons
✔✔You would most likely prefer an analog VOM over a DMM for: - ✔✔accuracy
✔✔Which of these circuits would most likely use a zener diode? - ✔✔a power regulator
✔✔A block in a digital diagram is called a NOR. Which is true? - ✔✔It is a NOT OR or
Inverted OR
✔✔Which of these statements is most true relating to schematic diagrams of electronic
devices? - ✔✔They represent signal paths
✔✔In personal computer technology, ROM indicates: - ✔✔memory that may only be
read from
✔✔A light emitting diode will light when: - ✔✔It is forward biased.
✔✔A zener diode is rated 6.3V. This tells you: - ✔✔it conducts to limit the voltage
across it to 6.3V
✔✔A triac is frequently used: - ✔✔for motor speed control, to electronically turn
equipment on and off
✔✔A technician must be knowledgeable about "ESD": - ✔✔because static discharge
can destroy many components.
✔✔In a motor, the counter-emf voltage induced in the armature the source current. -
✔✔subtracts from
✔✔One significant difference between a TV antenna and a CB antenna would be: -
✔✔TV is polarized horizontal while CB is vertical
✔✔"Switching power supplies": - ✔✔sometimes called DC to DC converters, maybe
operated of AC or DC sources
