Discussion
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- Question
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
- Correct Answer
- Lorentz number
- 1. 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 Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. In metals, the average drift velocity of electron per unit field is called mobility.
Options- A. True
- B. False Discuss
- 7. 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
- 8. Dielectric constant of transformer oil is about
Options- A. 1
- B. 4
- C. 10
- D. 20 Discuss
- 9. 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
- 10. Assertion (A): In many materials, dielectric polarization causes mechanical distortion.
Reason (R): If dielectric polarization causes mechanical distortion then mechanical distortion must cause dielectric polarization.
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
Materials and Components problems
Search Results
Correct Answer: zero
Explanation:
A superconductor has zero resistance.
Correct Answer: the number of free electrons and holes increases
Correct Answer: A-3, B-2, C-1
Correct Answer: A-2, B-3, C-1
Correct Answer: A-3, B-1, C-4, D-2
Correct Answer: True
Correct Answer: crystal
Correct Answer: 4
Correct Answer: two zeros
Correct Answer: A is true but R is false
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