Related Questions

Which of the following could be lamina proximately the thickness of laminations of a D.C. machine?
A 0.005 mm
B 0.05 mm
C 0.5 m
D 5 m
The degree of mechanical vibrations produced by the laminations of a transformer depends on
A tightness of clamping
B gauge of laminations
C size of laminations
D all of the above
The thickness of laminations used in a transformer is usually
A 0.4 mm to 0.5 mm
B 4 mm to 5 mm
C 14 mm to 15 mm
D 25 mm to 40 mm
The transformer laminations are insulated from each other by
A mica strip
B thin coat of varnish
C paper
D any of the above
The noise resulting from vibrations of laminations set by magnetic forces, is termed as
A Magnetostriction
B Boo
C Hum
D Zoom
The laminations of the armature of a D.C. machine are usually _____ thick.
A 0.1 to 0.2 mm
B 0.2 to 0.3 mm
C 0.3 to 0.4 mm
D 0.4 to 0.5 mm
A ferrite core has less eddy current loss than an iron core because
A Ferrites have high resistance
B Ferrites are magnetic
C Ferrites have low permeability
D Ferrites have high hysteresis
Multi-core cables generally use
A Square conductors
B Circular conductors
C Rectangular conductors
D None of the above
In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
A 5 percent
B 10 percent
C 15 percent
D 30 percent
E none of the above
The armature core of a D.C. generator is usually made of
A Silicon steel
B Copper
C Nonferrous material
D Cast-iron

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