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The Associate CET Study Guide: 2024
AST Practice EXAM 2: Appendix A
Rated A+
A track on a computer removable disk is:
A. One record
B. Divided into sectors
C. Created as data written
D. One continuous path โโB. Divided into sectors
In PC type computers, extended memory is:
A. Memory above the basic 640 K
B. Memory above the basic 1 Megabyte
C. Added to basic RAM in 1mb blocks
D. Adjusted by the start up files โโB. Memory above the basic 1 Megabyte
Which video system has the highest resolution?
A. EGA
B. VGA
C. SVGA
D. XVGA โโD. XVGA
You would want to use a dual trace oscilloscope to measure:
A. Signal differences between two points
B. Suspected resistance problems in one circuit
C. One faulty circuit in voltage level while another is faulty in a current level
D. One fault is video and the other is audio โโA. Signal differences between two points
Common Intermediate Frequencies (IF's) for AM and FM commercial broadcast receivers are:
A. 455 kHZ and 1.2 GHz
B. 288 kHZ and 455 kHz
C. 455 kHz and 10.7 MHz
Standard line-level audio signals, such as the output from VCRs, DVD players, satellite receivers and set top boxes, for input to a TV, modulator or other equipment is of what amplitude?
A. 100 microvolts peak-to-peak
B. 1000 microvolts peak-to-peak
C. 1 millivolt peak-to-peak
D. 1 volt peak-to-peak โโD. 1 volt peak-to-peak
The noise level in a radio receiver is generated mostly in the:
A. IF stages
B. Local Oscillator
C. Audio section
D. RF section โโD. RF section
The charging rate for a NiCad or Ni-MH battery should not exceed __________% of its AHr, or ampere-hour rating.
A. 5
B. 100
C. 25
D. 10 โโD. 10
Which of these in a PC would be part of disk operations?
A. Serial port board
B. DMA ports
C. CGA controller
D. SATA or IDE controller โโD. SATA or IDE controller
An LED:
A. Only emits visible light when forward biased
B. Can be used as a fiber optic signal source
C. Does not need high current flow protection
D. May send or receive light signals โโB. Can be used as a fiber optic signal source
Which propagation condition would be significant for a UHF signal to be received at a distance of 500 miles?
A. Line-of-sight
B. Faraday rotation
C. Groundwave
D. Tropospheric ducting โโD. Tropospheric ducting
A three input NAND has two low inputs and one high input. The output is:
A. Low
B. High
C. Either high or low
D. Neither high or low โโB. High
Which of these would be considered a component of a "basic" power supply?
A. Feedback circuit
B. IC regulator with short circuit protection
C. Diode rectifier
D. Circuit breaker box โโC. Diode rectifier
A "Video Signal" is defined as:
A. Modulated RF
B. Baseband including sound information
C. Baseband including visual information
D. Broadband RF โโC. 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:
A. Should be disconnected
B. May be ignored
C. Should be discharged to chassis ground, through a suitable resistor
Which of these would be an important electrical consideration in the use of a transformer?
A. The operating frequency
B. Space requirements
C. Environmental temperatures
D. Number of laminations โโA. The operating frequency
If a 12v product is dissipating 50w, how much load resistance does the device represent?
A. .24 ohms
B. 24 ohms
C. 4.16 ohms
D. 2.9 ohms โโD. 2.9 ohms
An "Audio signal" is defined as:
A. Frequencies in the 20 Hz to 15,000 Hz range
B. Baseband including visual information
C. Frequencies above ultrasonic
D. Broadband RF โโA. Frequencies in the 20 Hz to 15,000 Hz range
__________ will cause a generator to produce DC voltage rather than AC.
A. Slip rings
B. Load
C. Armature loops
D. The commutator โโD. The commutator
You suspect the unit has an internal short,. To prevent further damage when you apply power, you should:
A. Short around the main fuse or breaker and proceed, watching for heat or arching
B. Replace the unit without attempting repairs, as it probably can't be repaired safely
C. Measure the resistance at the DC connectors and compare to factory specifications
D. There is no difference between the plates after charging begins โโA. Current is maximum at first, then reduces as the capacitor becomes charged
An electrolytic capacitor between the power transformer and the rectifiers in a power supply:
A. Protects the diodes from surges
B. Eliminates the need for filter capacitors
C. Is part of a voltage doubler circuit
D. Provides that earth ground be isolated from DC ground โโC. Is part of a voltage doubler circuit
Information travels through optic fiber via the flow of:
A. Protons
B. Lumens
C. Photons
D. Electrons โโC. Photons
You Would most likely prefer an analog VOM over a DMM for:
A. Intermittent fluctuations
B. Accuracy
C. Convenience
D. Safety โโB. Accuracy
Which of these circuits would most likely use a Zener diode?
A. A receiver 1 F section
B. A television tuner
C. A power regulator
D. A bridge rectifier โโC. A power regulator
A block in a digital diagram is called a NOR. Which is true?
A. It may also be called a NAND
B. It is a NOT OR or Inverted OR
A. The gate is turned on
B. At avalanche
C. It is forward biased
D. It is reversed biased โโC. It is forward biased
A Zener diode is rated 6.3 v. This tells you:
A. It conducts to limit the voltage across it to 6.3 v.
B. Requires 6.3 v gate voltage in order to turn on
C. Generates 6.3 v if activated by light
D. Regulates a power supply voltage at 6.3 v โโA. It conducts to limit the voltage across it to 6.3 v.
A Triac is frequently used:
A. For motor speed control
B. As a power supply rectifier
C. For power surge protection
D. To electronically turn equipment on and off โโD. To electronically turn equipment on and off
A technician must be knowledgeable about "ESD":
A. To be able to select the proper soldering device
B. Because voltage sensitive devices come in numerous sizes
C. In order that he will have the proper test equipment for them
D. Because static discharge can destroy many components โโD. Because static discharge can destroy many components
In a motor, the counter-emf voltage induced in the armature __________ the source current.
A. Adds to
B. Subtracts from
C. Does not affect
D. Is unaffected by โโB. Subtracts from
A. A klystron
B. An op-amp
C. An MOV
D. LCD's โโB. An op-amp
A transformer on a schematic has two leads connected to the primary and three to the secondary, one on each end and one in the middle. This is a/an:
A. Audio transformer
B. I F transformer
C. Center tapped secondary transformer
D. High voltage transformer โโC. Center tapped secondary transformer
The 9 pin DB9 connector serial port on a PC is commonly called the __________ standard.
A. Centronics
B. RS
C. DIN
D. USB โโB. RS
Three capacitors, of 470 pf, 560 pf and .47 pf are in parallel with each other. The total is:
A. .47 pf
B. 2.13 pf
C. 1030.47 pf
D. 1.03047 uf โโC. 1030.47 pf
Ohm's law provide equations relating to:
A. Volts, amps and resistance
B. Amps, joules and resistance
C. Decibels, resistance and volts
D. Power, emf and current โโA. Volts, amps and resistance
A power source such as a generator or battery might be compared to what component in a water supply system?
