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Current Affairs January 2024

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A capacitor opposes change in

A. Voltage

B. Current

C. Voltage and current

D. Neither voltage nor current

Correct Answer :

A. Voltage


Related Questions

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When voltage is applied across a ceramic dielectric the electrostatic field p roduced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is

A.

B.

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A factor that states how much the resistance changes for a change in temperature?

A. Resistivity

B. Specific resistance

C. Coefficient of temperature change

D. Temperature coefficient of resistance

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The superposition theorem is used when the circuit contains

A. Reactive elements

B. Active elements

C. Number of voltage sources

D. Single voltage source

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What is the most common non-sinusoidal waveform?

A. Square wave

B. Triangular wave

C. Trapezoidal wave

D. Sawtooth wave

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When two pure sine waves of the same frequency and the same amplitude which are exactly 180� outof-phase are added togethera the result is

A. A wave with twice the amplitude

B. A wave with half the amplitude

C. Zero signal

D. A wave with twice the frequency

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Refers to the outward-curving distortion of the lines of force near the edges of two parallel metal plates that form a capacitor.

A. Skin effect

B. Night effect

C. Edge effect

D. Hall effect

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What is the complex impedance of a circuit with an absolute resistance of 300 ?

A. 0 + j 300

B. 300 + j 90

C. 0 ± j 300

D. 300 +j 0

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If a certain circuit has a current that is lagging the voltage by 45�a then it displays

A. Pure inductive reactance

B. Resistance and capacitance reactance

C. Resistance and inductive reactance

D. Pure capacitive reactance

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Which of the following is a common material used in wire-wound resistors?

A. Manganin

B. Carbon

C. Bronze

D. German silver wire

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What is the time constant for L of 240 mH in series with R of 20 ?

A. 12 ms

B. 4.8 s

C. 83.3 s

D. 12 s

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A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in seriesa the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.

A. Child�s law

B. CR law

C. Coulomb�s law

D. Debye T3 law

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In a circuita an active element is one which

A. Supplies energy

B. Receives energy

C. Both supplies and receives energy

D. Amplifies signal

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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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If a capacitor is rated for 200V dca what is its effective ac working voltage?

A. 50 V

B. 100 V

C. 200 V

D. 400 V

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For a linear circuita ___ voltage or current is used to calculate average power.

A. Rms

B. Peak

C. Average

D. Instantaneous

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The charge in the capacitor is stored at the

A. Terminals

B. Plates

C. Dielectric

D. Air

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Which of the statements below is not true?

A. Current source is an active element

B. Resistor is a linear element

C. Voltage source is a passive element

D. Diode is a non-linear element

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Which of the following does not generally affect the value of a capacitor?

A. The dielectric material used

B. The surface area of the plates

C. The thickness of the dielectric

D. The voltage applied to the plate

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The internal resistance of an ideal voltage source is

A. Infinite

B. Equal to the load resistance

C. Zero

D. To be determined

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Which of the following materials has the lowest dielectric strength?

A. Glass

B. Paper

C. Mica

D. Teflon

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As applied to a series RLCcircuita bandwidth means

A. The frequency range for maximum power transfer

B. The difference between the highest and lowest frequencies of the oscillator

C. The separation of the half-power points

D. The frequency at which XL= XC

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The curve between current and frequency is termed as

A. Voltage curve

B. Gain curve

C. Power curve

D. Resonance curve

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Resistor with colored bands in the body

A. Wire-wound resistor

B. Carbon-composition resistor

C. Potentiometer

D. Rheostat

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When two in-phase sine waves that have identical frequency and amplitude are added togethera then the result is a sine wave with ___ the amplitude of either.

A. Half

B. Twice

C. Four times

D. One-fourth

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If three 100-pF capacitors are connected in seriesa then the total capacitance is

A. 300 pF

B. 100 pF

C. 50 pF

D. 33.3 pF

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For multi-plate capacitora capacitance is proportional to

A. Number of plates less one(n ± 1)

B. Number of plates plus one(n + 1)

C. Number of plates less two(n - 2)

D. Number of plates (n)

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The reciprocal of a complex number is

A. A complex number

B. A real number

C. An imaginary number

D. A whole number

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An inductive load always has a ___ power factor

A. Leading

B. Lagging

C. Zero

D. Unity

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In an inductive coila the rate of rise of current is maximum

A. Near the final maximum value of current

B. At midvalue of current

C. At half-power points

D. After one time constant

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What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?

A. 14.5 kHz

B. 145 MHz

C. 14.5 MHz

D. 145 kHz