Curioustab
Aptitude
General Knowledge
Verbal Reasoning
Computer Science
Interview
Aptitude
General Knowledge
Verbal Reasoning
Computer Science
Interview
Home
»
Electronics and Communication Engineering
»
Materials and Components
In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µr will
increase
decrease
first decrease then increase
first increase then decrease
Correct Answer:
first increase then decrease
← Previous Question
Next Question→
More Questions from
Materials and Components
The number of valence electrons in acceptor impurity are
Ferrites have
A permeable substance is one
Which of the following is the poorest conductor of electricity?
In a pure sample of silicon
In intrinsic semiconductors, the number of free electrons is equal to the number of mobile holes.
Assertion (A): In a parallel plate capacitor having area of plate 1 m2 and plate separation 1 m, the capacitance C and resistance R are given by C = ∈0∈'r and R = where ω is frequency, ∈r' and ∈r" are real and imaginary parts of dielectric constant. Reason (R): The imaginary part of electric constant is responsible for dielectric losses.
Assertion (A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magnetic field. Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field.
When subjected to alternating stresses, an insulating material is characterised by complex dielectric constant ∈'r - j∈"r . In such materials, the dielectric losses under alternating stress is proportional
Assertion (A): Relaxation time and mean time between collisions are equal when scattering is isotropic. Reason (R): Mean free path of an electron λ, velocity of electron v and mean time between collisions tc are related as λ = vTc.
Discussion & Comments
No comments yet. Be the first to comment!
Name:
Comment:
Post Comment
Join Discussion
Discussion & Comments