Barium swallow is a dedicated test of the pharynx, oesophagus, and proximal stomach, and may be performed as a single or double contrast study.arium swallow is a dedicated test of the pharynx, oesophagus, and proximal stomach, and may be performed as a single or double contrast study.
up vote 9 down vote accepted. In Windows Azure Virtual Machine for Windows you can find drive C and D. Drive C is the boot OS disk and the size is actually the size of your VHD you have either uploaded or configured from the Gallery.
A. A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFDâs vary the speed of an AC motor by varying the frequency to the motor. VSDâs referring to DC motors vary the speed by varying the voltage to the motor.. Yes, a variable frequency drive can replace a soft start starter, since most drives give you a current limiting ramp to start and stop your motor. BUT, if you do not need to vary the production speed of your motor, then the soft start starter is still the correct product for the application.