The thickness of laminations used in a transformer is usually

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

The thickness of laminations used in a transformer is usually

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