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16.
Which optical disc format supports a data capacity of 25GB?
- A.Double-sided, double-layer DVD+R
- B.Single-sided, single-layer Blu-ray disc
- C.Double-sided, single-layer DVD-R
- D.Double-sided, single-layer DVD+R
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Blu-ray discs have a single-sided, single-layer capacity of 25GB. The best the other options achieve is no more than roughly 17GB. |
17.
Which of the following best describes the concept of hot-swappable devices?
- A.Power does not need to be turned off before the device is inserted or removed.
- B.The device can be removed with power applied after it is properly stopped in the operating system.
- C.Care must be taken when swapping the device because it can be hot to the touch.
- D.The device can be swapped while still hot, immediately after powering down the system.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Hot-swappable devices can be removed while the power to the system is still on. Warmswappable devices need to be stopped in the operating system before being removed. The term has nothing to do with the heat level of the device. |
18.
Of the following voltage pairings, which one accurately represents the input and output,
respectively, of power supplies and AC adapters?
- A.AC in, AC out
- B.DC in, DC out
- C.AC in, DC out
- D.DC in, AC out
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Power supplies and AC adapters use standard wall outlets for an input of AC voltage, which they convert to the DC voltages required by the components they supply power to. |
19.
What are the five output voltages that have been commonly produced by PC power supplies
over the years? (Choose five.)
- A.+3.3VDC
- B.-3.3VDC
- C.+5VDC
- D.-5VDC
- E.+12VDC
- F.-12VDC
- F.+110VAC
- H.-110VAC
- Answer & Explanation
- Report
Answer : [A,C,D,E,F]
Explanation :
Explanation :
| A PC’s power supply produces +3.3VDC, +5VDC, –5VDC, +12VDC, and –12VDC from a 110VAC input. |
20.
Which of the following statements about power supplies is true?
- A.You must make sure the voltage selector switch on the back of the power supply is switched to the lower setting if the computer is going to be used in Europe.
- B.SATA hard drives most often use the same type of power connector PATA hard drives use.
- C.Power supplies supply power to ATX-based motherboards with connectors known commonly as P8 and P9.
- D.Molex connectors are used with PATA hard drives, while Berg connectors are used with floppy drives.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Molex power connectors have been used with larger internal devices since the original PCs hit the market. When the 31⁄2g floppy diskette drives were launched, they used the newer Berg connectors. Europe requires the voltage selector switch be set at the higher setting. SATA drives most often use a specific power connector that is not compatible with the Molex connector used by PATA drives. AT-based motherboards call for P8 and P9 connectors; ATX motherboards have a newer 20- or 24-pin single power connector. |
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