This set of Manufacturing Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Magnetic Properties of Material”.
1. Which of the following parameter is used to assess the magnetic ability of a material?
a) Magnetic flux density
b) Magnetization
c) Magnetic dipole moment
d) Susceptibility
View Answer
Explanation: Magnetic susceptibility is a measure to quantify the ability of a material to undergo magnetization in an applied magnetic field. It is the ratio of magnetization (M) to the applied magnetic field intensity (H).
2. For a diamagnetic material, which of the following statement is correct?
a) Magnetic susceptibility < 0
b) Magnetic susceptibility > 0
c) Magnetic susceptibility = 0
d) Magnetic susceptibility = 1
View Answer
Explanation: Diamagnetic materials are those which repel magnetic field and hence their magnetic susceptibility (χ) is negative.
3. For a diamagnetic material, which of the following statement is correct (μr = relative permeability)?
a) μr > 2
b) μr < 1
c) μr > 1
d) μr = 1
View Answer
Explanation: A diamagnetic material has a constant relative permeability (μr) slightly less than 1.
4. For a paramagnetic material, which of the following statement is correct?
a) Magnetic susceptibility < 0
b) Magnetic susceptibility > 0
c) Magnetic susceptibility = 0
d) Magnetic susceptibility = -1
View Answer
Explanation: Magnetic susceptibility (χ) is very small positive quantity for a paramagnetic material.
5. For a paramagnetic material, which of the following statement is correct (μr = relative permeability)?
a) μr = 0
b) μr < 1
c) μr > 1
d) μr < 0
View Answer
Explanation: A paramagnetic material has a constant relative permeability (μr) slightly greater than 1.
6. What is the curie temperature of iron (in kelvin scale)?
a) 2195 K
b) 495 K
c) 895 K
d) 1095 K
View Answer
Explanation: The curie temperature of iron is about 1095K. It changes its magnetic behaviour from ferromagnetic to paramagnetic.
7. With an increase in temperature, magnetic susceptibility of a ferromagnetic material ____________
a) Increases
b) Decreases
c) Remains constant
d) First increases and then decreases
View Answer
Explanation: Magnetic susceptibility of a ferromagnetic material decreases with increase in temeprature.
8. With an increase in temperature, magnetic susceptibility of an anti-ferromagnetic material ____________
a) Increases
b) Decreases
c) First decreases and then increases
d) First increases and then decreases
View Answer
Explanation: Susceptibility of an anti-ferromagnetic material is first increases and then decreases with increase in temperature.
9. With an increase in the area of hysteresis curve, power loss will ___________
a) Increases
b) Decreases
c) First decreases and then increases
d) First increases and then decreases
View Answer
Explanation: Power loss is directly proportional to the area of hysteresis curve.
10. Magnetic Bubbles are used as __________
a) Storage device
b) Strain gauge
c) Thermostat
d) Potentiometer
View Answer
Explanation: Magnetic bubbles are small magnetized areas used as storage devices (data bites). One good thing about magnetic bubbles are they do not disappear when power is turned off.
Sanfoundry Global Education & Learning Series – Manufacturing Engineering.
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