Q. Which of the following is /are donor atoms?
A. antimony
B. arsenic
C. bismuth or phosphorus
D. All of the above
Ans.: D
Q. In N- type materials, electron is ____ carrier and the hole is _____ carrier.
A. minority, majority
B. minority, minority
C. majority, minority
D. majority, majority
Ans.: C
Q. In P- type materials, electron is ____ carrier and the hole is _____ carrier.
A. majority, majority
B. majority, minority
C. minority, minority
D. minority, majority
Ans.: D
Q. Which of the following is / are acceptors atoms?
A. gallium
B. boron
C. indium or aluminium
D. All of the above
Ans.: D
Q. The dielectric materials which provide electrical insulation between the conductors is known as_____.
A. insulators
B. dielectric
C. semiconductors
D. insulate
Ans.: D
Q. The function of dielectric material is to___.
A. provide insulation between the conductors
B. stored electrical energy
C. provide conduction path for current
D. any of the above
Ans.: B
Q. _____ of the molecules of polar dielectric materials posses a dipole moment.
A. Due to center of gravity of positive and negative charges
B. due to center of gravity of two positive charges
C. due to center of gravity of two negative charges
D. any of the above
Ans.: A
Q. The dipole moment appears in molecules is proportional to the _____.
A. magnetic field intensity
B. electric field intensity
C. electrostatic field
D. electromagnetic force
Ans.: B
Q. Dielectrics are polarizes due to_____.
A. Internal field
B. magnetic field
C. External field
D. electrostatic field
Ans.: C
Q. The dipole moment is in the direction of ______ of applied _____.
A. opposite, magnetic field
B. in the direction, magnetic field
C. opposite direction, electric field
D. in the direction, electric field
Ans.: D
Q. What happens if polarization lags the applied field strength?
A. it leads to an electrical energy loss
B. it leads to magnetic field loss
C. it leads to increase in electrical energy
D. any of the above
Ans.: A
Q. ____ is leads to degradation of the dielectric and breakdown.
A. Overheating and
B. cyclic heating
C. Both A and B
D. none of the above
Ans.: C
Q. Dielectrics are rated by
A. dielectric strength
B. relative permittivity
C. tangent of lag angle
D. all of the above
Ans.: D
Q. An ideal insulating material should posses
A. good dielectric strength
B. good mechanical strength
C. fireproofing qualities
D. all of the above
Ans.: D
Q. The insulating materials may be classified as
A. Fibrous materials, Impregnated fibrous materials
B. Non-resinous materials, insulating liquids
C. Ceramics, Mica, Glass
D. all of the above
Ans.: D