Related Questions

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 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
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is
A Pipe vibrations
B Cavitation
C Boundary layer separation
D Fluctuation in liquid flow
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
A Reynold stresses
B Shear forces
C Both A & B
D Neither A nor B
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
A 30°
B 60°
C 90°
D 120°
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 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

Next steps