Some hearing milestones your child should reach in the first year of life: 1  Most newborn infants startle or jump to sudden loud noises. 2  By 3 months, a baby usually recognizes a parent's voice. 3  By 6 months, a baby can usually turn his or her eyes or head toward a sound.
(December 2008). Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies.
An electrical adjustable-speed drive consists of an electric motor and a speed controller or power converter plus auxiliary devices and equipment. In common usage, the term âdriveâ is often applied to just the controller.[3][4] made by dr beshoo george. [edit] Motor control centers. A motor control center (MCC) is an assembly of one or more enclosed sections having a common power bus and principally containing motor control units.[1] Motor control centers are in modern practice a factory assembly of several motor starters.