Which inductor is used at high frequencies? Cast iron cored Sheet steel cored Ir

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments

Question
Which inductor is used at high frequencies?
Options
A. Cast iron cored
B. Sheet steel cored
C. Iron alloy cored
D. Ceramic cored

Correct Answer

Ceramic cored

Explanation

Cast iron, sheet steel and iron alloy have very high hysteresis and eddy current losses at high frequencies.

Materials and Components problems

Search Results

1. Fleming's left hand rule is used to find
Options
A. direction of force on a current carrying conductor
B. direction of flux in solenoid
C. direction of magnetic field due to a current carrying conductor
D. direction of induced emf

5. The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
Options
A. Matthiessen's rule
B. Debye rule
C. Curie rule
D. Onne's rule

7. By inserting a plate of dielectric between the plates of a parallel plate capacitor, the energy stored in the capacitor is increased five times. The dielectric constant of material is
Options
A.
B.
C. 5
D. 25

8. In van der walls crystals, there exists a high degree of stability of the outer electron shell.
Options
A. True
B. False

9. A vacuum parallel plate capacitor is charged. The field between the plates is 2 x 10⁴ V/m. If the space between the plates is filled with a material having ?_r = 10, then the value of field in the dielectric will be
Options
A. 2 x 10³ V/m
B. x 10⁴ V/m
C. 210 x 10⁴ V/m
D. 2 x 10⁵ V/m

10. If W_F is the Fermi level, then in a metal at T = 0
Options
A. all energy levels above W_F filled, all those below W_F are empty
B. all energy levels below W_F are filled, all those above W_F are empty
C. some energy levels, both below and above W_F, are filled
D. all energy levels below and above W_F are filled

Comments

There are no comments.

More in Electronics and Communication Engineering: