Which of the following materials is preferred for transmitting electrical energy over long distance ?

Related Mcqs:

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

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

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

   A. increases
   B. decreases
   C. does not change

3. Copper, even though costly, finds use in the windings of electrical machines because_____________?

   A. copper points offer low contact resistance
   B. copper can be easily soldered and welded
   E. copper windings are less bulky and the machines become compact
   D. all of the above

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

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

5. Which of the following materials does not have covalent bonds ?

   A. Organic polymers
   B. Silicon
   C. Metals

6. Which of the following high resistance materials has the highest operating temperature ?

   A. Kanthal
   B. Manganin
   C. Nichrome
   D. Eureka

7. Which of the following materials is used for making coils of standard resistances ?

   A. Copper
   B. Nichrome
   C. Platinum
   D. Manganin

8. Which of the following materials is the best conductor of electricity ?

   A. Tungsten
   B. Aluminium
   C. Copper
   D. Carbon

9. Spark plug makes use of which of the following materials for insulation ?

   A. Porcelain
   B. Slate
   C. Asbestos
   D. Glass

10. Commonly used conducting materials are_____________?

    A. copper
    B. aluminium
    C. both (A) and (B)
    D. copper and silver
    E. platinum and gold