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

Related Mcqs:

1. 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...

2. The impurity atoms is semiconductors_____________?

   A. inject more charge carriers B. reduce the energy gap C. increase the kinetic energy of valence electrons 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. 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...

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

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

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

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

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. Which of the following factors affect resistivity of metals ?

   A. Age hardening B. Alloying C. Temperature D. Cold work E. All of the above...

9. Solder is an alloy of______________?

   A. copper and aluminium B. tin and lead C. nickel, copper and zinc D. silver, copper and lead...

10. The conductivity of a metal is determined by____________?

    A. the electronic concentration and the mobility of the free electrons B. the number of valence electrons per atom C. either (A) or (B) D. none of the above...