Which practical test should be made on the electric gyro instruments prior to starting an engine?

At an altitude of 6,500 feet MSL, the current altimeter setting is 30.42” Hg. The pressure altitude would be approximately

Rate of turn can be increased and radius of turn decreased by

What is the procedure for setting the altimeter when assigned an IFR altitude of 18,000 feet or higher on a direct flight off airways?