IndiaBIX

Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 8
41.
The core of a solenoid is made of material of relative permeability μr. A small cavity area dA and length dl is cut in the core. If it is desired that flux density in the cavity should be equal to B0
the fields inside and outside the cavity must be equal
the field inside the cavity must be made stronger than field outside the cavity
the field inside the cavity must be made weaker than the field outside the cavity
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
A copper specimen has resistivity equal to 1.8 x 10-8 ohm-m at room temperature. At a temperature of 700 K, the resistivity is likely to be
1.6 x 10-8 Ω-m
2 x 10-8 Ω-m
3 x 10-8 Ω-m
6 x 10-8 Ω-m
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.

Assertion (A): Dielectric constant is independent of temperature unless the temperature is extremely high.

Reason (R): For normal temperatures the number of atoms per unit volume is constant.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

For normal temperatures the dielectric constant depends on the number of atoms per unit volume.

44.
As the atoms of rare gases become larger, electronic polarizability
increases
decreases
remains the same
may increase or decrease
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
Ferrimagnetic materials have anti-parallel orientation of equal moments of permanent dipoles.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers