Materials and Components problems
- 1. All magnetic materials exhibit the phenomenon of saturation.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. Which inductor is linear?
Options- A. Air cored
- B. Cast iron cored
- C. Sheet steel cored
- D. Iron alloy cored Discuss
Correct Answer: Air cored
Explanation:
For magnetic materials, permeability is not constant.
- 3. The units for intrinsic strength of dielectric are
Options- A. kV
- B. kV/m
- C. A
- D. A/m Discuss
Correct Answer: kV/m
Explanation:
Dielectric strength is expressed in volts (or kV) per unit distance (cm or mm).
- 4. Spontaneous magnetisation is characteristic of ferromagnetic materials.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. In p type semiconductor, the conductivity due to holes is (e = charge on hole, ?p = hole mobility, p = hole concentration)
Options- A.
- B.
- C. pe?p
- D.
Discuss
Correct Answer: pe?p
- 6. Assertion (A): Holes are majority carriers in p type semiconductor.
Reason (R): In p type semiconductor, the electrons produced by thermal agitation recombine with holes.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Correct Answer: Both A and R are true and R is correct explanation of A
- 7. Silicon and germanium have diamond structure. The number of atoms in a volume equal to a3 where a is the edge of elementary cube are
Options- A. 32
- B. 16
- C. 8
- D. 4 Discuss
Correct Answer: 8
- 8. Specific resistance of silver is about
Options- A. 0.16 x 10-8 ?-m
- B. 1.64 x 10-8 ?-m
- C. 16 x 10-8 ?-m
- D. 164 x 10-8 ?-m Discuss
Correct Answer: 1.64 x 10-8 ?-m
- 9. The two conductors of a transmission line carry equal current I in opposite direction. The force on each conductor is
Options- A. proportional to I
- B. proportional to I2
- C. proportional to distance between the lines
- D. proportional to I3 Discuss
Correct Answer: proportional to I2
- 10. A characteristic property of crystal is its periodicity of structure.
Options- A. True
- B. False Discuss
Correct Answer: True
More in Electronics and Communication Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.