Discussion
Home ‣ Electronics and Communication Engineering ‣ Materials and Components See What Others Are Saying!
- Question
As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = ri + aT, where ri and a are constants and T is absolute temperature. At very low temperatures
Options- A. aT = 0
- B. aT > ri
- C. aT ? ri
- D. aT < ri
- Correct Answer
- aT < ri
ExplanationAt very low temperatures a T ? 0. Since resistivity has a finite value even at low temperature, a T < ri.
More questions
- 1. The characteristic impedance of a cable is about
Options- A. 300 ?
- B. 50 ?
- C. 5 ?
- D. 2 ? Discuss
Correct Answer: 50 ?
- 2. A copper atom is neutral. Its core has a net charge of
Options- A. 0
- B. + 1
- C. - 1
- D. + 2 Discuss
Correct Answer: + 1
- 3. The characteristics of which device has peak point and valley point
Options- A. SCR
- B. PUT
- C. SCS
- D. Shockley diode Discuss
Correct Answer: PUT
- 4. Schrodinger wave equation is partial differential equation.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. The output frequency of a cycloconverter can be changed by changing the firing angle.
Options- A. True
- B. False Discuss
Correct Answer: False
- 6. Most of the memory chips in static RAM
Options- A. do not require any supply
- B. need 2 V supply
- C. need 5 V supply
- D. need 12 V supply Discuss
Correct Answer: need 5 V supply
Explanation:
Digital chips need 5 V supply.- 7. In crystalline solids, atoms are stacked in a regular manner.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. The classes of solid dielectrics are
Options- A. A, B, C, D, E, F, H
- B. A E B F H C D
- C. Y A E B F H C
- D. A E B F H C Discuss
Correct Answer: Y A E B F H C
- 9. The unit for mmf is
Options- A. A
- B. Wb
- C. T
- D. V Discuss
Correct Answer: A
- 10. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally
Options- A. equal
- B. different
- C. equal or different
- D. different but sometimes equal Discuss
Correct Answer: equal
Explanation:
Firing angles are kept equal to get symmetrical output voltage.
Comments
There are no comments.
More in Electronics and Communication Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.