Computer Programming MCQs

5739 MCQs  (Page 185 of 574)

Which of the following statements is correct ?
A. The conductivity of ferrites is better than ferromagnetic materials
B. The conductivity of ferromagnetic materials is better than ferrites
C. The conductivity of ferrites is very high
D. The conductivity of ferrites is same as that of ferromagnetic materials
For which of the following materials the net magnetic moment should be zero ?
A. Diamagnetic materials
B. Ferrimagnetic materials
C. Antiferromagnetic materials
D. Antiferrimagnetic materials
Temporary magnets are used in______________?
A. Loud-speakers
B. Generators
C. Motors
D. All of the above
The attraction capacity of electromagnet will increase if the_______________?
A. Core length increases i
B. Core area increases
C. Flux density decreases
D. Flux density increases
For which of the following materials the saturation value is the highest ?
A. Ferromagnetic materials
B. Paramagnetic materials
C. Diamagnetic materials
D. Ferrites
The stray line of magnetic flux is defined as_____________?
A. A line vertical to the flux lines
B. The mean length of a ring shaped coil
C. A line of magnetic flux in a non-uniform field
D. A line of magnetic flux which does not follow the designed path
How does the magnetic compass needle behave in a magnetic field ?
A. It assures a position right angle to magnetic field
B. It starts rotating
C. It assures a position which follows a line of magnetic flux
D. None of the above