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Current Affairs January 2024

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4

If the inductance is decreaseda the impedance of the circuit containing a resistor a capacitor and an inductor connected in series to an ac source

A. Decreases

B. Increases

C. Decreases or increases

D. Decreasesa increases or remains the same

Correct Answer :

C. Decreases or increases


Related Questions

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4

When capacitors are connected in parallela the total capacitance is

A. Greater than the largest capacitor

B. Smaller than the largest capacitor

C. Smaller than the smallest capacitor

D. Greater than the smallest capacitor

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4

A resistor wound with a wire doubled back on itself to reduce the inductance.

A. Bifilar resistor

B. Wire-wound resistor

C. Anti-inductive resistor

D. Bleeder resistor

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4

Which of the following elements is active?

A. Resistor

B. Inductor

C. Capacitor

D. Ideal voltage source

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4

The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %a it is necessary to add ___ to the circuit.

A. Inductance

B. Capacitance

C. Resistance

D. Impedance

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4

Electron flow assumes charges flow from

A. Negative to positive

B. Negative to negative

C. Positive to negative

D. Positive to positive

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4

What fusion of elements is without chemical action between them?

A. Mixture

B. Compound

C. Alloy

D. Ionization

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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

What determines the direction of induced emf in a conductor or coil?

A. Cork screw rule

B. Fleming�s left hand rule

C. Ampere�s circuital law

D. Fleming�s right hand rule

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4

If the output resistance of a voltage source is 4 a it internal resistance should be

A.

B.

D. Infinite

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4

An inductor carries 2 A dc. If its inductance is 100 Ha then what is its inductive reactance?

A. Zero

B. 1.3 k

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4

A coil of inductance L has an inductive reactance of XLin an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is

A.

B. I2XL

C. IXL

D. IXL2

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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

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

The capacitance of a capacitor is ___ relative permittivity.

A. Directly proportional to

B. Inversely proportional to

C. Equal to

D. Inversely proportional to the square of

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4

Which is considered as the effect of a dielectric material?

A. Increasing capacitance

B. Decreasing capacitance

C. Reducing the working voltage

D. Increasing the distance between the plates

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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

For a series circuita the higher the quality factor

A. The greater the bandwidth

B. The narrower the passband

C. The broader the resonance curve

D. The wider the passband

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4

If an emf in circuit A produces a current in circuit Ba then the same emf in circuit Bproduces the same current in circuit ? this theorem is known as

A. Maximum power transfer theorem

B. Millman�s theorem

C. Reciprocity theorem

D. Norton�s theorem

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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

A capacitor requires 12 C of charge to raise its potential of 3 V. What is the capacitance of the capacitor?

A. 36 F

B. 15 F

C. 0.25 F

D. 4 F

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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

A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20a000 ohms?

A.

B.

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4

What is the peak factor for alternating current or voltage varying sinusiodally?

A.

B.

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4

In Norton�s theorema the short circuit current is obtained by

A. Opening the load terminals

B. Shorting the load terminals

C. Opening the voltage source

D. Shorting the voltage source

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4

When two complex conjugates are subtracteda the result is a

A. Quadrature component only

B. Complex component

C. In-phase component

D. Real component

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4

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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4

What is the peak factor of a triangular wave?

A.

B.

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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

Which one of the following elements serves as a protection against overload?

A. Fuse

B. Switch

C. Resistor

D. Relay

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4

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