Discussion
Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments
- Question
When a material becomes a superconductor, its resistivity becomes
Options- A. very small
- B. zero
- C. about 10% of normal value
- D. about 20% of normal value
- Correct Answer
- zero
ExplanationA superconductor has zero resistance.
Materials and Components problems
Search Results
- 1. As the temperature of a pure silicon specimen is increased
Options- A. the number of free electrons increases
- B. the number of holes decreases
- C. the number of holes increases
- D. the number of free electrons and holes increases Discuss
Correct Answer: the number of free electrons and holes increases
- 2. Match the following:
List I (type of controller) List II (Operation) A. Pneumatic controller 1. Flexible operation B. Hydraulic controller 2. High torque high speed operation C. Electronic controller 3. Fire and explosion proof operation
Options- A. A-1, B-3, C-2
- B. A-1, B-2, C-3
- C. A-3, B-1, C-2
- D. A-3, B-2, C-1 Discuss
Correct Answer: A-3, B-2, C-1
- 3. Match the following:
List I (Operator) List II (Description) A. & & 1. Assignment B. | | 2. Logical AND C. = 3. Logical OR
Options- A. A-1, B-2, C-3
- B. A-2, B-3, C-1
- C. A-3, B-2, C-1
- D. A-1, B-3, C-2 Discuss
Correct Answer: A-2, B-3, C-1
- 4. Match the following:
List I (Instrument) List II (Parameters) A. Moving coil galvanometer 1. High inertia, soft spring control B. Ballistic galvanometer 2. No control, high damping C. Vibration galvanometer 3. Soft spring control, critical damping D. Moving coil flux meter 4. Low inertia, tuned spring control
Options- A. A-4, B-2, C-3, D-1
- B. A-1, B-3, C-2, D-4
- C. A-2, B-1, C-4, D-3
- D. A-3, B-1, C-4, D-2 Discuss
Correct Answer: A-3, B-1, C-4, D-2
- 5. Match the following:
List I List II A. TV 1. 1 kHz B. Radio 2. 3 kHz C. Telephony 3. 9 kHz D. Telegraphy 4. 5 MHz
Options- A. A-4, B-1, C-2
- B. A-4, B-3, C-2
- C. A-2, B-1, C-3
- D. A-1, B-2, C-3 Discuss
Correct Answer: A-4, B-3, C-2
- 6. In metals the thermal conductivity K and electrical conductivity ? are related as (K/?T) = L, L is known as
Options- A. Lattice constant
- B. Lorentz number
- C. Lanevin function
- D. Larmor number Discuss
Correct Answer: Lorentz number
- 7. In metals, the average drift velocity of electron per unit field is called mobility.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. Silicon and germanium atoms combine orderly into array of atoms located in repetitive geometric pattern. This pattern is called
Options- A. crystal
- B. covalent bond
- C. molecule
- D. valence bond Discuss
Correct Answer: crystal
- 9. Dielectric constant of transformer oil is about
Options- A. 1
- B. 4
- C. 10
- D. 20 Discuss
Correct Answer: 4
- 10. In carbon resistor colour code, the third band is red. It indicates
Options- A. two zeros
- B. three zeros
- C. multiplier is 0.01
- D. multiplier is 0.1 Discuss
Correct Answer: two zeros
Comments
There are no comments.
More in Electronics and Communication Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.