Effect of moisture on the insulating materials is to________________?

Related Mcqs:

1. Surface resistance of an insulating material is reduced due to the______________?

   A. smoky and dirty atmosphere B. humidity in the atmosphere C. both (A) and (b) D. neither (A) nor (b)...

2. is the property of absorbing moisture from atmosphere_____________?

   A. Solubility B. Viscosity C. Porosity D. Hygroscopicity...

3. Commonly used conducting materials are_____________?

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

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

   A. Copper B. Aluminium C. Steel reinforced copper D. Steel reinforced aluminium...

5. High resistivity materials are used in_____________?

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

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

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

7. Piezoelectric materials serve as a source of ____________ ?

   A. resonant waves B. musical waves C. microwaves D. ultrasonic waves...

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

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

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

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

10. Low resistivity materials are used in__________?

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