The Associate CET Study Guide: 2007 AST Practice EXAM #2: Appendix A Questions And Answers

The Associate CET Study Guide: 2007 AST Practice EXAM #2: Appendix A Questions And Answers /. A track on a computer removable disk is: A. One record B. Divided into sectors C. Created as data written D. One continuous path - Answer-B. 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 - Answer-B. Memory above the basic 1 Megabyte /.Which video system has the highest resolution? A. EGA B. VGA C. SVGA D. XVGA - Answer-D. 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 - Answer-A. 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 D. 288 kHz and 10.7 MHz - Answer-C. 455 kHz and 10.7 MHz /.Analog signal compression: A. Uses D/A converters B. Reduces the high frequency received signal amplitude C. Changes AM to FM D. Primarily reduce background noise levels - Answer-B. Reduces the high frequency received signal amplitude /.Coaxial cable line losses at RF frequencies are due to: A. Wire resistance, capacitive and inductive reactance B. Wire resistance, dielectric fading and transconductance C. Capacitive and inductive reactance and braid leakage D. Magnetic effects of near by materials - Answer-A. Wire resistance, capacitive and inductive reactance /.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 - Answer-D. 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 - Answer-D. 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 - Answer-D. 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 - Answer-D. 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 - Answer-B. Can be used as a fiber optic signal source /.A dual-trace oscilloscope may have: A. Two electron guns B. One frequency control C. One set of position controls D. A Z input for intensity modulation - Answer-D. A Z input for intensity modulation /.The gain of an op-amp is determined by the external _________. A. Supply voltage B. + input DC voltage C. Series input resistor D. Feedback and input resistors - Answer-D. Feedback and input resistors /.Diodes are made from one type of material. A. True B. False - Answer-B. False /.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 - Answer-D. 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 - Answer-B. 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 - Answer-C. Diode rectifier /.A "Video Signal" is defined as: A. Modulated RF B. Baseband including sound information C. Baseband including visual information D. Broadband RF - Answer-C. 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 D. Should be isolated with a non- conductive cover and avoided - Answer-C. Should be discharged to chassis ground, through a suitable resistor /.A schematic used in electronic servicing: A. Shows the size and shape of all the components in the unit B. Is sometimes call a block diagram C. Shows the location and arrangement of components in the unit D. Is much like a road map for following signals - Answer-D. 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 HV PS by: A. Shorting output to the plastic cabinet B. Disconnecting the HV lead with rubber gloves C. Draining thru a large value resistor to chassis ground D. Shorting output of the collector heat sinks - Answer-C. Draining thru a large value resistor to chassis ground /.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 - Answer-A. The operating frequency /.If a 12v product is dissipating 50w, how much load resistance does the device represent?