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.Management Sciences
Category: Magnetism and Electromagnetism
A permeable substance is one_____________?
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A. which is a good conductor
B. which is a bad conductor
C. which is a strong magnet
D. through which the magnetic lines of force can pass very easily
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
A. 22 x 10″8 N
B. 22 x 10″7 N
C. 22 x 10-6 N
D. 22 x 10″5 N
Which of the following is the unit of magnetic flux density ?
A. weber
B. lumens
C. tesla
D. none of the above
The use of permanent magnets is. not made in_____________?
A. magnetoes
B. energy meters
C. transformers
D. loud-speakers
he retentivity (a property) of material is useful for the construction of__________?
A. permanent magnets
B. transformers
C. non-magnetic substances
D. electromagnets
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
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