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 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
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 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 steam pipe is to be insulated by two insulating materials put over each other. For best results
A Better insulation should be put over pipe and better one over it
B Inferior insulation should be put over pipe and better one over it
C Both may be put in any order
D Whether to put inferior OIL over pipe or the better one would depend on steam temperature
Which of the following is the main advantage of an auto-transformer over a two-winding transformer?
A Eddy losses are totally eliminated
B Copper losses are negligible
C Saving in winding material
D Hysteresis losses are reduced
The output transformer used in a power amplifier is a ___________ transformer
A 1:1 ratio
B Step-up
C Step-down
D None of the above
The changes in volume of transformer cooling oil due to variation of atmospheric tem-perature during day and night is taken care of by which part of transformer
A Conservator
B Breather
C Bushings
D Buchholz relay

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