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 transformer laminations are insulated from each other by
A mica strip
B thin coat of varnish
C paper
D any of the above
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
Laminations of core are generally made of
A Case iron
B Carbon
C Silicon steel
D Stainless steel
The noise resulting from vibrations of laminations set by magnetic forces, is termed as
A Magnetostriction
B Boo
C Hum
D Zoom
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is
A d > m > e
B d > e > m
C e > m > d
D e > d > m
The actual thickness of butt weld as compared to the thickness of plate is usually
A More
B Less
C Equal
D None of the above
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
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

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