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Current Affairs January 2024

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4

With double the number of turns by the same length and areaa the inductance is

A. The same

B. Doubled

C. Quartered

D. Quadrupled

Correct Answer :

D. Quadrupled


Related Questions

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4

Delta to wye or wye to delta transformation technique is applied to a ___ network.

A. One-terminal

B. Two-terminal

C. Three-terminal

D. Complex

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4

If voltage across the plates of 2 F capacitor is increased by 4 Va then charge on the plates will

A. Decrease by 2 C

B. Increase by 2 C

C. Decrease by 4 C

D. Increase by 4C

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4

When the movable plates of a gang capacitor completely overlap the fixed platesa the capacitance of the capacitor is

A. Halfway between maximum and minimum

B. Maximum

C. Minimum

D. Zero

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4

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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4

How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?

A. 2.592 x 105C

B. 2.592 x 103 C

C. 2.592 x 108 C

D. 2.592 x 1012 C

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4

Which of the following is a way of decreasing mutual inductance?

A. Moving the coils closer

B. Moving the coils apart

C. Decreasing the number of turns of either coil

D. Increasing the number of turns of either coil

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4

Which of the following describes the action of a capacitor?

A. Stores electrical energy

B. Opposes changes in current flow

C. Creates a dc resistance

D. Converts ac to dc

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4

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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4

Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is

A. Positive

B. Negative

C. Zero

D. Infinite

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4

When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its reactance of frequency 2f is

A. Inductive

B. Capacitive

C. Resistive

D. Infinite

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4

Electric energy refers to

A. Volt divided by coulomb

B. Voltampere

C. Volt-coulomb

D. Watt divided by time

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4

Refers specifically to steady state values of quantities in ac circuits which are complex numbers.

A. Domain

B. Scalar quantity

C. Vector quantity

D. Phasor quantity

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4

A circuit whose parameters change with voltage or current.

A. Non-linear circuit

B. Linear circuit

C. Complex circuit

D. Passive circuit

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4

A capacitor is used to

A. Block dc current

B. Pass dc current

C. Open voltage source

D. Short the voltage source

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4

The electric field strength between capacitor plates has a unit

A. Volts per meter

B. Volts per mil

C. Amperes per meter

D. Amperes per mil

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4

The area of capacitor plates increases two timesa then its capacitance

A. Increases two times

B. Increases four times

C. Decreases two times

D. Decreases four times

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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

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 a factor affecting capacitance oor?

A. Area of plates

B. Number of plates

C. Distance between plates

D. Dielectric material used

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4

What value of R is needed with a 0.05 F Cfor an RCtime constant of 0.02 s?

A.

B. 400 M

C. 400 G

D. 400 k

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4

What is the reciprocal of quality factor?

A. Power factor

B. Reactive factor

C. Dissipation factor

D. 1/Q factor

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4

A series-parallel combination of identical resistors will

A. Increase the power rating compared with one resistor alone

B. Increase the voltage rating compared with one resistor alone

C. Reduce the voltage rating compared with resistor alone

D. Result in an expensive circuit

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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

How many degrees of phase represents one full cycle?

A.

B.

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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 does a capacitor store?

A. Voltage

B. Charge

C. Current

D. Power

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4

Which statement is true?

A. A series resonant circuit is of high impedance

B. A parallel resonant circuit is of low impedance

C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

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4

If two equal resistances connected in series across a certain supply are now connected in parallel across the same supplya the power produced will be _____ that of series connection

A. One-half

B. One-fourth

C. Two times

D. Four times

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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

The internal resistance of an ideal voltage source is

A. Infinite

B. Equal to the load resistance

C. Zero

D. To be determined