This sets of mcq includes objectives on magnetic materials, susceptibility, magnetization and numericals in part 5...

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## SET 1 of magnetic materials mcq

1. Which of the following sets gives the ferromagnetic Curie temperatures in ascending order:

**A. Ni, Fe, Co**

B. Co, Ni, Fe

C. Ni, Co, Fe

D. Fe, Co, Ni.

**Answer A**

Marks 2

2. In a material an application of magnetic field of 2.75A/m causes a magnetic flux density of 0.2485 Wb/ m2 then its relative permeability and susceptibility are:

**A. 0.071 and -0.929**

B. 0.929 and 0.071

C. 0.06 and -0.09

D. -0.071 and -0.091

**Answer A**

Marks 2

3. If susceptibility of magnetic material is 3.7x10-3 , magnetic density is 12.5 T then the magnetization is

A. 37A/m

B. 1.26 A/m

C. 3.7 A/m

**D. None**

**Answer D**

Marks 2

4. If susceptibility of magnetic material is 3.7x10-3 , magnetic density is 12.5 T then the material is

A. Ferromagnetic

B. Diamagnetic

**C. Paramagnetic**

D. None

**Answer C**

Marks 2

5. Select the correct answer using the code given: Susceptibility of diamagnetic material is

1) negative

2) positive

3) dependent on temperature

4) independent on temperature

A. 1&3

B. 2&4

**C. 1&4**

D. 2&3

**Answer C**

Marks 2

6. If magnetic material has large internal stresses & non-magnetic inclusion, it has

A. More permeability

B. Less resistivity

C. Large eddy current

**D. Large coercive force**

**Answer D**

Marks 2

7. The magnetization of a magnetic material is 8.5 x 10-3A/m and magnetic field intensity is given by 10000 A/m therefore its susceptibility is given by:

A. 8.5 x 10-3

**B. 8.5 x 10-7**

C. 8.5 x 10-3A/m

D. 8.5 x 10-7 A/m

**Answer B**

Marks 2

8. The Hysteresis loss is 350W/ (m3 .cycle) for specimen of alloy steel having a maximum density of 1 Wb / m2

at a frequency of 50Hz. The density of given material is 7800 kg/m3 ,hence its actual hysteresis loss is:

A. 2.44 W/ kg

**B. 2.244W/ kg**

C. 2.42 W.kg

D. 2.24 W.kg

**Answer B**

Marks 2

9. The hysteresis loop area of an iron specimen is equivalent to 200 Joules /m3 ,if the weight of the specimen is 40kg & its density is 8000 kg/ m3 then its hysteresis loss in Joules is

A. 4

B. 2

C. 3

**D. 1**

**Answer D**

Marks 2

10. Susceptibility of diamagnetic, paramagnetic, Ferromagnetic and ferrimagnetic material is respectively

A. Positive, 10-5 (small and positive), -10-6 (negative), & Very large and positive

**B. -10-6 (i.e.negative), 10-5 (small and positive), Very large and positive & Small and positive**

C. Very large and positive, Small and positive,-10-6 (i.e.negative)& 10-5 (small and positive)

D. 10-5 (small and positive), -10-6 (i.e.negative), Small and positive & Very large and positive

**Answer B**

Marks 2

## SET 1 of magnetic materials mcq

11. In a magnetic material the field strength is 106A/m. If the magnetic susceptibility of the material is -0.5x10-5 , then magnetization & flux density in the material are

A. -5 A/m & 8.853x10-6 T

B. -8 A/m & 5.125 T

**C. -5 A/m & 1.2565 T**

D. -3 A/m & 1.512 T

**Answer C**

Marks 2

12. In a material an application of magnetic field of 1.72x105 A/m 0.2162 T, then type of material is………..

A. Diamagnetic

**B. Paramgnetic**

C. Ferromagnetic

D. Non-magnetic

**Answer B**

Marks 2

13. If 1250 kg of iron subjected to magnetization of 50Hz, density being 8000 kg/m3 , hysteresis loop area 180 J/m3 , then hysteresis loss is….

A. 281.25 J

**B. 28.125 J**

C. 2.8125 J

D. 18.252 J

**Answer B**

Marks 2

14. Correct option for ascending order of magnetic field due to 1.Electron Spin, 2. Orbital motion of electron & 3.Nucleus spin is…..

A. 1-2-3

B. 2-3-1

C. 3-1-2

**D. 3-2-1**

**Answer D**

Marks 2

15. If supply frequency is increased from by 10 %, then %change in hysteresis & eddy current are respectively…

A. 20% & 10%

**B. 10% & 21 %**

C. 20% & 30%

D. 21% & 31%

**Answer B**

Marks 2

16. In a material an application of magnetic field of 1.75x105 A/m causes Magnetic flux density of 0.2182 T then, its magnetization is ---- A/m.

A. -1635

B. -1400

**C. -1365**

D. -1536

**Answer C**

Marks 2

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