Q. An electromagnetic device used to detect and locate grounded, shorted and open coils in an armature :
Solution:
A growler is an electrical device used for testing insulation of a motor for shorted coils. A growler consists of a coil of wire wrapped around an iron core and connected to a source of alternating current. When placed on the armature or stator core of a motor the growler acts as the primary of a transformer and the armature coils act as the secondary. A “feeler”, a thin strip of steel (hacksaw blade) can be used as the short detector.
Related Questions
Q. Type of microphone which converts acoustic signals to change in capacitance is
View SolutionQ. If the supply frequency to the transformer is increased the iron loss will:
View SolutionQ. Buchholz’s relay gives warning and protection against
View Solution
Get Question Bank
Strengthen Your Practice with our comprehensive question bank.
