# Basic Electronics Engineering Questions and Answers – Passive Circuit Components – Variable Capacitors

This set of Basic Electronics Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Passive Circuit Components – Variable Capacitors”.

1. The capacitance of the variable capacitor is ________
a) Fixed
b) Varied
c) Zero
d) Cannot be determined

Explanation: The value of capacitance of the variable capacitor can be changed according to our requirement. In fixed capacitor, this is not possible. The value of capacitance is fixed for them at the time of manufacture.

2. Variable capacitors in general consists of interwoven set of _______
a) metallic plates
b) Gold plates
c) Silver plates
d) Platinum plates

Explanation: The variable capacitors in general consists of the set of interwoven metallic plates. One of them is fixed and the other is variable. These capacitors can be used to vary the capacitance between the range of 10-500pF.

3. What is the symbol of variable capacitor?
a)
b)
c)
d)

Explanation: The symbol of the variable capacitor is . The symbol of polarized capacitor is . The symbol of the fixed capacitor . The symbol of the battery is .

4. The ganged capacitor is the combination of _____
a) Two fixed capacitors
b) Two variable capacitors
c) One fixed capacitor and one variable capacitor
d) One variable capacitor and one polarized capacitor

Explanation: The ganged capacitor is the combination of the two variable capacitors. The two variable capacitors are connected together. A single shaft is used to rotate the variable ends of these capacitors which are combined as one.

5. For tuning the LC circuits in radio receivers _____ are used.
a) Fixed capacitors
b) Variable capacitors
c) Polarized capacitors
d) Non-polarized capacitors

Explanation: The variable capacitor is used for tuning the LC circuits in radio receivers. They are also used for matching the impedance of antennas. The fixed capacitors are not used for these purposes. Both the polarized and non-polarized capacitors are also fixed capacitors.

6. Tuning capacitors contains _______
a) Stator, rotor and frame
b) Stator and rotor
c) Stator and frame
d) Rotor and frame

Explanation: The tuning capacitors consists of the stator, rotor and frame that is used to support the stator and mica capacitor. Stator is stationary [part and the rotor rotates to produce electro magnetic force and they come close to form plates of capacitor.

7. The capacitance value of the tuning capacitors is maximum when ______
a) The rotor plates sit completely in the stator slots
b) The stator plates sit completely in the rotor slots
c) The stator plates do not sit in rotor slots
d) The rotor plates sit partially in the stator slots

Explanation: The capacitance of the tuning capacitors is maximum when the rotor plates sits completely in the slots of the stator. If the rotor plates do not sit in the slots of the stator then the capacitance of the capacitor is minimum.

8. The ganged tuning capacitors are also called as____
a) Trimmer capacitors
b) Tuning condensers
c) Tuning capacitors
d) Ganged capacitors

Explanation: The ganged tuning capacitors are also called as tuning condensers. These capacitors are between the pico farads to tens of the pico farads. These are used in LC circuits in radio receivers. So, they are called as tuning condensers.

9. Trimmer capacitors can be varied using _____
a) Wrench
b) Pliers
c) Screw driver
d) Tester

Explanation: The trimmer capacitors are provided with a screw on the surface of it. To adjust the capacitance of the capacitor, the screw is to be twisted. For this purpose, a screw driver is used.

10. how many leads will be present in the trimmer capacitor?
a) 4
b) 2
c) 1
d) 3

Explanation: There are 3 leads in the trimmer capacitor. One lead is connected to stationary plate, other connected to the rotatory plate and the other one is common. The movable disc is the semi circular shaped one.

Sanfoundry Global Education & Learning Series – Basic Electronics Engineering.

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