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Question-1. Capacitor is active device or passive device?
Question-2. Capacitor store which type of energy?
Answer-2: Electrical energy
Question-3. Capacitor allows flowing which type of current in it?
Answer-3: A.C. current
Question-4. If two capacitor (c1, c2) connect in parallel then total capacitance is?
Answer-4: Ceq. = C1 + C2
Question-5. Formula for capacitor?
Answer-5: C = Q/V
Question-6. what is difference between capacitor & inductor?
Answer-6: Capacitor store energy in the form of electrical energy where as inductor store energy in form of magnetic energy.
Question-7. What is features of paper capacitor?
Answer-7: Impregnated paper was extensively used for older capacitors, using wax, oil, or epoxy as an impregnant. Oil-Kraft paper capacitors are still used in certain high voltage applications. Has mostly been replaced by plastic film capacitors.
Question-8. what are features of electrolytic capacitor?
Answer-8: Very large capacitance to volume ratio, inexpensive, polarized. Primary applications are as smoothing and reservoir capacitors in power supplies.
Question-9. What are dielectric used in capacitors?
Answer-9: Air-gap: air-gap capacitors have a low dielectric loss. Large-valued, tunable capacitors that can be used for resonating HF antennas can be made this way. Ceramic: the main differences between ceramic dielectric types are the temperature coefficient of capacitance, and the dielectric loss. C0G and NP0 (negative-positive-zero, i.e. ?0) dielectrics have the lowest losses, and are used in filters, as timing elements, and for balancing crystal oscillators. Ceramic capacitors tend to have low inductance because of their small size.
Question-10. Explain construction of capacitor?
Answer-10: Capacitor have thin conducting plates (usually made of metal), separated by a layer of dielectric, then stacked or rolled to form a compact device. Many types of capacitors are available commercially, with capacitance ranging from the picofarad, microfarad range to more than a farad, and voltage ratings up to hundreds of kilovolts. In general, the higher the capacitance and voltage rating, the larger the physical size of the capacitor and the higher the cost. Tolerances in capacitance value for discrete capacitors are usually specified as a percentage of the nominal value. Tolerances ranging from 50% (electrolytic types) to less than 1% are commonly available. Another figure of merit for capacitors is stability with respect to time and temperature, sometimes called drift. Variable capacitors are generally less stable than fixed types.
Question-11. Define Capacitor?
Answer-11: Capacitor is a device for storing charges. It consists if two metal plates placed parallel with a dielectric or an insulating medium in between them.
Question-12. Define Capacitance of a Capacitor?
Answer-12: The capacity of a capacitor is numerically equal to the quantity of charge which must be given to the condenser in order to maintain the unit potential difference between the plates.
Question-13. On what factors the capacity of a capacitor depends?
Answer-13: It depends on
a) area of the plate
b) distance between the plates is called dielectric constant of the material used.
Question-14. Define time constant of the RC circuit?
Answer-14: It is defined as the time required for the capacitor to charge to 63% of its maximum value. It is equal to the product of R & C.
Question-15. Through which component does the discharge takes place?
Answer-15: The discharge takes place through the resistance.
Question-16. What is the maximum voltage attained by the capacitor?
Answer-16: Equal to the applied voltage.
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