is usually used for brush rockers

Related MCQs

• In a D.C. machine the number of brush arms is _____ the number of poles.
• In a D.C. machine the current per brush arm should not be more than
• The high voltage winding is usually which of the following type ?
• The laminations of the armature of a D.C. machine are usually _____ thick.
• In D.C. machines the width of the duct is usually
• In D.C. machines the number of slots per pole usually lies
• Which ofthe following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
• is universally used for windings of electrical machines because it is easily workable without any possibility of fracture.
• ________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
• ______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?