Which of the following factors affect resistivity of metals ?

Related Mcqs:

1. Which of the following affect greatly the resistivity of electrical conductors ?

   A. Composition B. Pressure C. Size D. Temperature...

2. On which of the following factors does the resistivity of a material depend ?

   A. Resistance of the conductor B. Area of the conductor section C. Length of the conductor D. All of the above...

3. High resistivity materials are used in_____________?

   A. precision instruments B. heating elements C. motor starters D. incandescent lamps E. all of the above...

4. By increasing impurity content in the metal alloy the residual resistivity always_____________?

   A. decreases B. increases C. remains constant D. becomes temperature independent...

5. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?

   A. increases B. decreases C. does not change...

6. The resistivity of a metal is a function of temperature because_____________?

   A. the amplitude of vibration of the atoms varies with temperature B. the electron density varies with temperature C. the electron gas density varies with temperature...

7. Low resistivity materials are used in__________?

   A. transformer, motor and generator windings B. transmission and distribution lines C. house wiring D. all above applications...

8. Most of the common metals have _________ structure?

   A. linear B. hexagonal C. orthorhombic D. cubic...

9. Due to which of the following factors the brush wear rate is altered ?

   A. Speed of the machine B. Contact pressure C. Surface conditions of brush and commutator D. Excessive sparking E. All of the above...

10. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?

    A. Nichrome B. Constantan C. Kanthal D. Molybdenum...