Related Questions

The noise resulting from vibrations of laminations set by magnetic forces, is termed as
A Magnetostriction
B Boo
C Hum
D Zoom
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 frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
A More than
B Less than
C Same as
D None of these
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.
A Equal to
B Directly proportional to
C Inversely proportional to
D Independent of
Which motor is normally free from mechanical and magnetic vibrations ?
A Split phase motor
B Universal motor
C Hysteresis motor
D Shaded pole motor
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for
A fans
B blowers
C sound equipment
D mixer grinders
Laminations of core are generally made of
A Case iron
B Carbon
C Silicon steel
D Stainless steel
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 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

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