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.Management Sciences
Category: Magnetism and Electromagnetism
Which of the following type of materials are not very important for engineering applications ?
A. Ferromagnetic
B. Paramagnetic
C. Diamagnetic
D. None of the above
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
A. circular
B. triangular
C. rectangular
D. none of the above
The relative permeability is less than unity is case of_____________?
A. ferromagnetic materials
B. ferrites
C. non-ferrous materials
D. diamagnetic materials
The change of cross-sectional area of conductor in magnetic field will affect______________?
A. reluctance of conductor
B. resistance of conductor
C. A. and B. both in the same way
D. none of the above
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
In the left hand rule, forefinger always represents______________?
A. voltage
B. current
C. magnetic field
D. direction of force on the conductor
Which of the following is a ferromagnetic material ?
A. Tungsten
B. Aluminium
C. Copper
D. Nickel
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
A. meter is surrounded by strong magnetic fields
B. a soft iron shielding is used
C. a plastic shielding is provided
D. a shielding of anon-magnetic material is used
The initial permeability of an iron rod is________________?
A. the highest permeability of the iron rod
B. the lowest permeability of the iron rod
C. the permeability at the end of the iron rod
D. the permeability almost in non-magnetised state
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