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4

A gang capacitor is a variable capacitor in which capacitance is varied by changing the

A. Dielectric

B. Number of plates

C. Plate area

D. Distance between plates

Correct Answer :

C. Plate area


Related Questions

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4

Of the equivalent combination of unitsa which one is not equal to watt?

A. 2/V

B. AV

C. A2

D. J/s

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4

The ratio of W/VA in an ac circuit means

A. Power factor

B. Reactive factor

C. Quality factor

D. Load factor

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4

A capacitance of 0.05 F equals

A. 0.05 x 106F

B. 0.05 x 10-6F

C. 0.05 x 10-12F

D. 0.05 x 1012F

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4

Which of the following does not refer to electrical energy?

A. Volt-ampere

B. Joule

C. Watt-second

D. Volt-coulomb

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4

What theorem is usually used in the analysis of transistor circuit?

A. Superposition theorem

B. Millman�s theorem

C. Thevenin�s theorem

D. Norton�s theorem

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4

Voltage resonance means

A. Series resonance

B. Parallel resonance

C. Current magnification

D. Gain magnification

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4

Which of the following is not considered a physical factor affecting resistance?

A. Length

B. Material type

C. Temperature

D. Cross-sectional

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4

The maximum power transfer theorem is used in

A. Power system

B. Electronic system

C. Refrigeration

D. Air conditioning

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4

At what frequency will an inductor of 5mH have the same reactance as a capacitor of 0.1 F?

A. 7.12 kHz

B. 7.12 Hz

C. 7.12MHz

D. 7.12 GHz

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4

Liquids that are good conductors because of ionization are called

A. Electrolytic

B. Bases

C. Acid

D. Electrolytes

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4

For maximum power transfera what is the relation between load resistance RL and internal resistance R of the voltage source?

A. RL= 2 r

B. RL= 1.5 r

C. RL= r

D. RL= 3 r

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4

What is expected when two 20 k a 1 watt resistor in parallel are use instead of one 10 k a 1 watt?

A. Provides higher current

B. Provides less power

C. Provides more power

D. Provides wider tolerance

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4

Inductive reactance applies only to sine waves because it

A. Increases with lower frequencies

B. Increases with lower inductance

C. Depends on the factor 2

D. Decreases with higher frequencies

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4

A capacitor consists of two

A. Conductors only

B. Dielectric only

C. Conductors separated by a dielectric

D. Dielectric separated by a conductor

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4

A term used to express the amount of electrical energy stored in electrostatic field.

A. Joules

B. Coulombs

C. Watts

D. Electron-volt

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4

What can be used to estimate resonant frequency and to find reactance at any frequency for any value of capacitor or inductor?

A. Smith chart

B. Reactance chart

C. Impedance chart

D. Resonance chart

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4

The factor 0.707for converting peak to rms applies only to

A. Square waves

B. Triangle waves

C. Sawtooth waves

D. Sine waves

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4

Which statement is true about a passive circuit?

A. A circuit with neither a source of current nor a source of potential difference

B. A circuit with a voltage source

C. A circuit with a current source

D. A circuit with only resistance as a load

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4

What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?

A. 1.65 kHz

B. 16.5 MHz

C. 16.5 kHz

D. 165 kHz

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4

What is the specific resistance of a pure silicon?

A. 55 -mm

B. 55 -m

C. 55 -cm

D. 55 k -m

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4

A rheostat is a form of

A. Variable resistor

B. Variable capacitor

C. Potentiometer

D. Thermocouple

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4

In a circuita a passive element is one which

A. Supplies energy

B. Receives energy

C. Both supplies and receives energy

D. Attenuates signal

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4

Which of the following is the most popular waveform?

A. Sinusoidal

B. Square wave

C. Triangular

D. Sawtooth

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4

Which of the following is also known as antiresonant circuit?

A. Parallel resonant circuit

B. Series resonant circuit

C. Tuned circuit

D. Tank circuit

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4

Which of the following combination of length and cross-sectional area will give a certain volume of copper the least resistance?

A. 2L and1/2 A

B. Does not matter because the volume of copper remains the same

C. L and A

D. ½ L and 2 A

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4

What is the purpose of a load in an electric circuit?

A. To increase the circuit current

B. To decrease the circuit current

C. To utilize electrical energy

D. To make the circuit complete

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4

For series capacitorsa total charge is

A. The sum of individual charges

B. Equal to the charge of either capacitors

C. Equal to the product of the charges

D. The quotient of the charges

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4

Parallel resonant circuit is sometimes called as

A. Acceptor circuit

B. Rejector circuit

C. Inductive circuit

D. Capacitive circuit

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4

What increases the resistance of wire at high frequencies?

A. Temperature

B. Voltage

C. Skin effect

D. Insulation

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4

For parallel capacitorsa total charge is

A. The sum of individual charges

B. Equal to the charge of either capacitors

C. Equal to the product of the charges

D. The quotient of the charges