Magnetic And Insulating Materials(Engineering > Engineering Materials ) Questions and answers for exam Preparation

Question 1. Pyrex glass is otherwise known as _________ glass.

soda lime
fused silica
borosilicate
pyroceram

Explanation:-

Answer: Option C. -> borosilicate
Answer: (c).borosilicate

Question 2. Pyroceram glass softens above ______

1000°C
2000°C
4500°C
5500°C

Explanation:-

Answer: Option B. -> 2000°C
Answer: (b).2000°C

Question 3. A copolymer of butadiene and acrylonitrile is known as __________

Nitrile rubber
Butyl rubber
Polysulphide rubber
Fluorine rubber

Explanation:-

Answer: Option A. -> Nitrile rubber
Answer: (a).Nitrile rubber

Question 4. What is the percentage of elongation of styrene butadiene rubber?

60-70%
140-160%
250-300%
500-600%

Explanation:-

Answer: Option D. -> 500-600%
Answer: (d).500-600%

Question 5. Cork is composed of _____ air.

<1%
<10%
20%
>50%

Explanation:-

Answer: Option D. -> >50%
Answer: (d).>50%

Question 6. What is the temperature at which a change from the anti-ferromagnetic phase to paramagnetic phase occurs?

Weiss
Curie
Neel
Debye

Explanation:-

Answer: Option B. -> Curie
Answer: (b).Curie

Question 7. The hysteresis loss in soft magnetic materials must be kept ______

High
Minimum
Zero
Unaltered

Explanation:-

Answer: Option B. -> Minimum
Answer: (b).Minimum

Question 8. The supermaloy primarily composed of ________________

Nickel
Iron
Cobalt
Copper

Explanation:-

Answer: Option A. -> Nickel
Answer: (a).Nickel

Question 9. Which of the following is an example of soft magnetic material?

Permalloy
Strontium
Alnico
Neodymium

Explanation:-

Answer: Option A. -> Permalloy
Answer: (a).Permalloy

Question 10. What is the relative permeability of iron?

250
1500
2700
100,000

Explanation:-

Answer: Option A. -> 250
Answer: (a).250