CORRECT!

2). How does a pilot normally obtain the current altimeter setting during an IFR flight in Class E airspace below 18,000 feet?

a). ATC periodically advises the pilot of the proper altimeter setting.
b). The pilot should contact ARTCC at least every 100 NM and request the altimeter setting.
c). FSS's along the route broadcast the weather information at 15 minutes past the hour.
The answer is:
a). ATC periodically advises the pilot of the proper altimeter setting.

Above 18,000 feet, all flights are required to be on an IFR flight plan and the altimeter must be set to 29.92.

Below 18,000 feet, ATC will periodically advise pilots on IFR flight plans of the current altimiter setting. This piece of information is included as a matter of course in many routine ATC/pilot transmissions, such as the initial check-in, during hand-offs and after clearances.

All pilots should make sure that a current altimeter setting is obtained and used every 10-15 minutes or as advised by ATC during flight ops. This helps to ensure accurate traffic separation during the enroute portion of the flight. Moreover, many instrument approaches include minimum descent altitudes (MDAs) or decision heights (DHs) that are only useable if the current altimeter setting from the source indicated on the approach chart is used. The minimums go up otherwise to ensure adequate terrain clearance during the approach.

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