This set of Basic Electronics Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Passive Circuit Components – Fixed Capacitors”.
1. The capacitance of the fixed capacitor _______
a) Cannot be varied
b) Can be varied
c) Is zero
d) Cannot be defined
View Answer
Explanation: The fixed capacitor is constructed in a way that its capacitance must have a fixed value of capacitance. It cannot be adjusted. It all depends on the dielectric material used to make the capacitor.
2. Paper capacitors usually range is about ___
a) 350picofarad-4microfarad
b) 300picofarad-4microfarad
c) 300picofarad-2microfarad
d) 350picofarad-2microfarad
View Answer
Explanation: The paper capacitors usually range from 300pf to 4mf. The working voltage of the paper capacitor rarely exceeds 600volts. The paper capacitor is made of flat thin strips of metal foil conductors that are separated by waxed paper.
3. Paper capacitors are sealed with war for _____
a) Preventing from fire
b) Preventing from dust
c) Preventing from corrosion
d) Preventing from smoke
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Explanation: Paper capacitors are sealed with wax because it prevents from the corrosion. It also prevents from moisture. Sometimes leakage may occur. It also can be prevented by using the wax. It also acts as dielectric material as the strips of metal foil is separated by wax.
4. Some types of paper capacitors are also encased in _____
a) Hard wax
b) Hard plastic
c) Hard coal
d) Copper
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Explanation: Many different kinds of outer coverings are used on paper capacitors. The simplest one is card board covering. Some types of paper capacitors are encased in the hard plastic. These types are very rugged and can be used over high temperatures.
5. In mica capacitors, the mica is used for ________
a) dissolvent
b) catalyst
c) adhesive
d) separating the metal foils
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Explanation: In mica capacitors, the mica is used to separate the meta foil trips that means mica acts as a dielectric. The total equipment is moulded in plastic case that prevents from corrosion and damaging.
6. In mica capacitors, the moulded plastic case makes the capacitor mechanically stronger.
a) True
b) False
View Answer
Explanation: The mica capacitors are moulded in a plastic case to protect the capacitor from damage and corrosion. In addition, it also makes the capacitor mechanically stronger. Various terminals are used in mica capacitors. These are also moulded in the plastic case.
7. The mica capacitors range from _____
a) 100pf to 0.02mf
b) 50pf to 0.02mf
c) 110pf to 0.01mf
d) 50pf to 0.01mf
View Answer
Explanation: The mica capacitors range from 50pf to 0.02mf. They are very accurate. They measure up to very small values. When compared to paper capacitors, mica capacitors are more efficient. Mica is an excellent dielectric that can withstand at higher voltages.
8. In ceramic capacitors, the ceramic is used in the form of __________
a) Sphere
b) Cuboid
c) Hollow sphere
d) Cylindrical
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Explanation: The ceramic is used as dielectric in the ceramic capacitors. One type of ceramic capacitors uses a ceramic cylinder as both form on which to construct the capacitor and as a dielectric material. The plates consist of thin films of metal deposited on ceramic cylinders.
9. In ceramic capacitor, the capacitor is covered with ______
a) Corrosion proof coating
b) water proof coating
c) smog proof coating
d) moisture proof coating
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Explanation: The moisture proof coating is done on the capacitor of the ceramic capacitor. The coating is insulating material. Some types of capacitors are manufactured in the shape of disk also.
10. The range of the ceramic capacitor is ______
a) 1pf to 0.01mf
b) 2pf to 0.01mf
c) 3pf to 0.01mf
d) 4pf to 0.01mf
View Answer
Explanation: The range of the ceramic capacitors is 1pf to 0.01mf. They measure very small capacitances and can’t measure high capacitances. They are not very effective but good to measure small amounts.
Sanfoundry Global Education & Learning Series – Basic Electronics Engineering.
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