BSNL JTO (CE) Paper 2007 with Solutions Explanations at doorsteptutor. Com Part 1

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Modern capacitors which have high capacitance in small size use a dielectric of

(A) Paper

(B) Rubber

(C) Ceramic

(D) Mylar

2. The Maximum spectral response of the germanium and silicon is in the

(A) Infrared region

(B) Ultraviolet region

(C) Visible region

(D) X-ray region

3. For an insulating material, dielectric strength and dielectric loss should be respectively

(A) High and high

(B) Low and high

(C) High and low

(D) Low and low

4. In a distortion factor meter, the filter at the front end is used suppress

(A) Odd harmonics

(B) Even harmonics

(C) Fundamental component

(D) DC component

5. The coefficient of coupling between two air core coils depends on

(A) Mutual inductance between two coils only

(B) Self inductances of the two coils only

(C) Mutual inductance and self-inductances of the two coils

(D) None

6. For a parallel plate capacitor which is being charged out of the following the incorrect statement is

(A) Energy stored in the capacitor does not enter it through the connecting wire through the connecting wire through the space around the wire and plates of capacitor.

(B) Rate at which energy flows into this volume is equal to the integration of the poynting vector over the boundary of the volume between the plates.

(C) The pointing vector points everywhere radially outward of the volume between plates.

(D) The pointing vector points everywhere radially in to the volume between the plates.

7. The presence of alkali oxides in alumina silicate ceramics is likely to result in dielectric breakdown due to

(A) Polarization

(B) Conductivity

(C) Structural homogeneities

(D) Ionization

8. Which of the following will serve as a donor impurity in silicon

(A) Boron

(B) Indium

(C) Germanium

(D) Antimony

9. Electrical contact materials used in switches, brushes and relays must possess

(A) High thermal conductivity and high melting point

(B) Low thermal conductivity and low melting point

(C) High thermal conductivity and low melting point

(D) Low thermal conductivity and high melting point

10. Low thermal conductivity and high melting point

(A) Cathode

(B) Anode

(C) Gates

(D) None

11. Gold is often diffused into silicon PN junction devices to

(A) Increase the recombination rate

(B) Reduce the recombination rate

(C) Make silicon a direct gap semiconductor

(D) Make silicon semi-metal

12. With n nodes and b branches a network will have

(A) links

(B) links

(C) links

(D) links

13. When a network has nodes and branches in all then the number of node pair voltages would be

(A)

(B)

(C)

(D)

14. In any atom the potential energy of an orbiting electron is

(A) Always positive

(B) Always negative

(C) Sometime positive, sometime negative

(D) Numerically less than its kinetic energy

15. A deletion MOSFET differs from a JFET in the sense that it has no

(A) Channel

(B) Gate

(C) P – N junction

(D) Subtract