UPPCL AE EE : Material System Quiz 1 for AE & JE Exams Exams

Question 1

Which of the following statement is not true for direct band gap semiconductor?

Question 2

Match List-I (Material/Characteristics) with List-II (Superconductor kind) and select the correct answer using the codes given below the lists:
List-I
A. Incomplete Meissner’s effect, high critical field and transition temperature. Absence of Silsbee’s rule
B. Meissner’s effect and Silsbee’s rule
C. Amorphous thin films of Bi and Fe
List-II
1) Hard superconductor
2) Soft superconductor
3) Superconductor

Question 3

The magnitude of critical density in a superconductor depends on:

Question 4

Match List-I (Insulating Material) with List-II (Application) and select the correct answer using the codes given below:
List-I
A) Steatite
B) Rutile (Titanium dioxide)
C) Barium titanate
D) Teflon
List-II
1) Ceramic capacitor
2) Piezoelectric application
3) Insulating materials for machine windings
4) High frequency insulator

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?

Question 6

Consider the following statements regarding superconductors:

1) At very high frequencies, the zero resistance of the superconductor is modified.

2) At very high frequencies, the transition temperature remains unaffected.

3) When persistent current increased beyond a critical value, the superconductor becomes a normal conductor.

Which of the above statements are correct?

Question 7

Match List-I (Material) with List-II (Carrier Concentration/m³) and select the correct answer using the codes given below the lists:
List-II
A) Intrinsic semiconductor
B) Insulator
C) Extrinsic semiconductor
D) Conductor
List-II
1) 10²⁸
2) 10²²
3) 10¹⁸
4) 10¹⁴

Question 8

In general, for a superconductor, which of the following statements is true?

Question 9

How many classes of insulating materials are present in electrical engineering?

Question 10

Which of the following class of insulating material include cotton, silk, paper, cellulose, wood, etc.