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ESE 2021 Technical Quiz || ceramic materials & insulating materials

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Question 1

Assertion (A): A p-type sample can be converted to a semi-insulating substrate by doping it with chrominum.
Reason (R): Chromium increases the band gap of Gas.

Question 2

Consider the following:
Applications of low permittivity ceramics include which of the following?
1) Suspension insulators for high voltage lines.
2) Superconductors.
3) Pin insulators for low voltage lines.
Select the correct answer using the code given below:

Question 3

Match List-Iwith List-II and select the correct answer using the code given below the lists:
List-I
A) Porcelain
B) Steatite
C) Mica
D) Rutile
List-II
1) Used for high frequency applications
2) Used in capacitors to be operated at high frequencies
3) Used for insulators
4) Releases water when heated

Question 4

Which is correct for insulators in overhead lines?
i. low insulating resistance
ii. high relative permittivity
iii. low puncher strength
iv. partly filled impurities

Question 5

Consider the following statements: Characteristics of a good insulating material are
1) Should give uniform electric and thermal properties.
2) High permittivity.
3) Low dissipation factor.
4) Low insulating resistance.
Which of the above statements are correct?
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Jun 27ESE & GATE EE