The maximum temperature limit of class B insulation is 90�C 105�C 120�C 130�C

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Question
The maximum temperature limit of class B insulation is
Options
A. 90�C
B. 105�C
C. 120�C
D. 130�C

Correct Answer

130�C

Materials and Components problems

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4. The application of magnetic field to superconducting material
Options
A. increases transition temperature
B. decreases transition temperature
C. has no effect on transition temperature
D. may increase or decrease the transition temperature

7. Assertion (A): The regular or irregular stacking of atoms has importanteffect on properties of materials.
Reason (R): The arrangement of atoms in a given material can be studied using X-rays.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

8. Assertion (A): Both sodium and ferrous are ferromagnetic.
Reason (R): Both sodium and ferrous have body centred cubic structure.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

9. Assertion (A): ?₀ has the dimensions of farad per meter.
Reason (R): D = ?₀?_r E.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

10. Assertion (A): Drift velocity of electrons is proportional to the applied electric field E.
Reason (R): The average drift velocity per unit field is called mobility.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

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