Which of the following statements is correct ?

Related Mcqs:

1. Which of the following statements is correct ___________?

   A. Air capacitors have a black band to indicate the outside foil
   B. Electrolytic capacitor must be connected in the correct polarity
   C. Ceramic capacitors must be connected in the correct polarity
   D. Mica capacitors are available in capacitance value of 1 to 10 pF

2. Which of the following statements is incorrect _________________?

   A. The leakage resistance of ceramic capacitors is generally high
   B. The stored energy in a capacitor decreases with reduction in value of capacitance
   C. The stored energy in a capacitor increases with applied voltage
   D. A wire cable has distributed capacitance between the conductors

3. Which of the following statements is incorrect ?

   A. The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .
   B. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF
   C. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination
   D. A capacitor can store charge because it has a dielectric between two conductors

4. Which of the following expression is correct for electric field strength___________?

   A. E = D/E
   B. E = D2/t
   C. E = jtD
   D. E= nD2

5. select the correct statement?

   A. the electric lines of force have no physical existence
   B. they expand laterally and contract longitudinally
   C. they do not cross each other and group together in dielectric
   D. all the above statements are true

6. Which of the following capacitors has relatively shorter shelf life____________?

   A. Mica capacitor
   B. Electrolytic capacitor
   C. Ceramic capacitor
   D. Paper capacitor

7. Which of the following materials has the highest value of dielectric constant___________?

   A. Glass
   B. Vacuum
   C. Ceramics
   D. Oil

8. Which is the most superior dielectric out of the following ?

   A. Air
   B. Glass
   C. Bakelite
   D. Paper

9. For closer tolerances which of the following capacitors is usually preferred ?

   A. Paper capacitor
   B. Mica capacitor
   C. Ceramic disc capacitor
   D. None of the above

10. Which of the following material has least value of dielectric constant ?

    A. Ceramics
    B. Oil
    C. Glass
    D. Paper