1. The main constituent of permalloy is ?

cobalt

chromium

nickel

tungsten

Answer: nickel

Explanation:


2. Tesla is a unit of ?

field strength

inductance

flux density

flux

Answer: flux density

Explanation:


3. The unit of relative permeability is ?

henry/metre

henry

henry/sq. m

it is dimensionless

Answer: it is dimensionless

Explanation:


4. Which of the following is expected to have the maximum permeability ?

Brass

Copper

Zinc

Ebonite

Answer: Ebonite

Explanation:


5. Paramagnetic materials have relative permeability ?

slightly less than unity

equal to unity

slightly more than unity

equal to that ferromagnetic materials

Answer: slightly more than unity

Explanation:


6. Aluminium and platinum are materials ?

ferromagnetic

diamagnetic

paramagnetic

insulating

Answer: paramagnetic

Explanation:


7. One telsa is equal to ?

1 Wb/mm²

1 Wb/m

1 Wb/m²

1 mWb/m²

Answer: 1 Wb/m²

Explanation:


8. A magnet does not attract ?

cobalt

nickel

copper

iron

Answer: copper

Explanation:


9. which of the fallowing is a vector quantity ?

Relative permeability

Magnetic field intensity

Flux density

Magnetic potential

Answer: Magnetic field intensity

Explanation:


10. The materials having low retentivity are suitable for making ?

weak magnets

temporary magnets

permanent magnets

none of the above

Answer: temporary magnets

Explanation: